Articles | Volume 7, issue 1
https://doi.org/10.5194/se-7-67-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/se-7-67-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
15 Jan 2016
Research article |
| 15 Jan 2016
Evolution of rheologically heterogeneous salt structures: a case study from the NE Netherlands
RWTH Aachen University, Energy- and Mineral Resources
Group, Structural Geology, Tectonics and Geomechanics, Aachen,
Germany
F. Strozyk
RWTH Aachen University, Energy and Mineral Resources
Group, Geological Institute, Aachen, Germany
J. Visser
Nedmag Industries Mining & Manufacturing B.V., Veendam,
the Netherlands
J. L. Urai
RWTH Aachen University, Energy- and Mineral Resources
Group, Structural Geology, Tectonics and Geomechanics, Aachen,
Germany
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Jessica Barabasch, Joyce Schmatz, Jop Klaver, Alexander Schwedt, and Janos L. Urai
Solid Earth, 14, 271–291, https://doi.org/10.5194/se-14-271-2023, https://doi.org/10.5194/se-14-271-2023, 2023
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We analysed Zechstein salt with microscopes and observed specific microstructures that indicate much faster deformation in rock salt with fine halite grains when compared to salt with larger grains. This is important because people build large cavities in the subsurface salt for energy storage or want to deposit radioactive waste inside it. When engineers and scientists use grain-size data and equations that include this mechanism, it will help to make better predictions in geological models.
Trudy M. Wassenaar, Cees W. Passchier, Nora Groschopf, Anna Jantschke, Regina Mertz-Kraus, and Janos L. Urai
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-32, https://doi.org/10.5194/bg-2023-32, 2023
Manuscript not accepted for further review
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Marbles in the desert areas of Namibia and Oman were found to be consumed from inside the rock mass by microbiological activity of a thus far unknown nature that created bands of parallel tubules. These bands formed along fractures in the rock and only surfaced after erosion made them visible. We consider this a new niche for life that has so far not been described. These life forms may have an unknown impact on the global carbon cycle.
Sivaji Lahiri, Kitty L. Milliken, Peter Vrolijk, Guillaume Desbois, and Janos L. Urai
Solid Earth, 13, 1513–1539, https://doi.org/10.5194/se-13-1513-2022, https://doi.org/10.5194/se-13-1513-2022, 2022
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Understanding the mechanism of mechanical compaction is important. Previous studies on mechanical compaction were mostly done by performing experiments. Studies on natural rocks are rare due to compositional heterogeneity of the sedimentary succession with depth. Due to remarkable similarity in composition and grain size, the Sumatra subduction complex provides a unique opportunity to study the micromechanism of mechanical compaction on natural samples.
Manuel D. Menzel, Janos L. Urai, Estibalitz Ukar, Thierry Decrausaz, and Marguerite Godard
Solid Earth, 13, 1191–1218, https://doi.org/10.5194/se-13-1191-2022, https://doi.org/10.5194/se-13-1191-2022, 2022
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Mantle rocks can bind large quantities of carbon by reaction with CO2, but this capacity requires fluid pathways not to be clogged by carbonate. We studied mantle rocks from Oman to understand the mechanisms allowing their transformation into carbonate and quartz. Using advanced imaging techniques, we show that abundant veins were essential fluid pathways driving the reaction. Our results show that tectonic stress was important for fracture opening and a key ingredient for carbon fixation.
Lisa Winhausen, Kavan Khaledi, Mohammadreza Jalali, Janos L. Urai, and Florian Amann
Solid Earth, 13, 901–915, https://doi.org/10.5194/se-13-901-2022, https://doi.org/10.5194/se-13-901-2022, 2022
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Triaxial compression tests at different effective stresses allow for analysing the deformation behaviour of Opalinus Clay, the potential host rock for nuclear waste in Switzerland. We conducted microstructural investigations of the deformed samples to relate the bulk hydro-mechanical behaviour to the processes on the microscale. Results show a transition from brittle- to more ductile-dominated deformation. We propose a non-linear failure envelop associated with the failure mode transition.
Rahul Prabhakaran, Giovanni Bertotti, Janos Urai, and David Smeulders
Solid Earth, 12, 2159–2209, https://doi.org/10.5194/se-12-2159-2021, https://doi.org/10.5194/se-12-2159-2021, 2021
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Rock fractures are organized as networks with spatially varying arrangements. Due to networks' influence on bulk rock behaviour, it is important to quantify network spatial variation. We utilize an approach where fracture networks are treated as spatial graphs. By combining graph similarity measures with clustering techniques, spatial clusters within large-scale fracture networks are identified and organized hierarchically. The method is validated on a dataset with nearly 300 000 fractures.
Lisa Winhausen, Jop Klaver, Joyce Schmatz, Guillaume Desbois, Janos L. Urai, Florian Amann, and Christophe Nussbaum
Solid Earth, 12, 2109–2126, https://doi.org/10.5194/se-12-2109-2021, https://doi.org/10.5194/se-12-2109-2021, 2021
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An experimentally deformed sample of Opalinus Clay (OPA), which is being considered as host rock for nuclear waste in Switzerland, was studied by electron microscopy to image deformation microstructures. Deformation localised by forming micrometre-thick fractures. Deformation zones show dilatant micro-cracking, granular flow and bending grains, and pore collapse. Our model, with three different stages of damage accumulation, illustrates microstructural deformation in a compressed OPA sample.
Marta Adamuszek, Dan M. Tămaş, Jessica Barabasch, and Janos L. Urai
Solid Earth, 12, 2041–2065, https://doi.org/10.5194/se-12-2041-2021, https://doi.org/10.5194/se-12-2041-2021, 2021
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We analyse folded multilayer sequences in the Ocnele Mari salt mine (Romania) to gain insight into the long-term rheological behaviour of rock salt. Our results indicate the large role of even a small number of impurities in the rock salt for its effective mechanical behaviour. We demonstrate how the development of folds that occur at various scales can be used to constrain the viscosity ratio in the deformed multilayer sequence.
Christopher Weismüller, Rahul Prabhakaran, Martijn Passchier, Janos L. Urai, Giovanni Bertotti, and Klaus Reicherter
Solid Earth, 11, 1773–1802, https://doi.org/10.5194/se-11-1773-2020, https://doi.org/10.5194/se-11-1773-2020, 2020
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We photographed a fractured limestone pavement with a drone to compare manual and automatic fracture tracing and analyze the evolution and spatial variation of the fracture network in high resolution. We show that automated tools can produce results comparable to manual tracing in shorter time but do not yet allow the interpretation of fracture generations. This work pioneers the automatic fracture mapping of a complete outcrop in detail, and the results can be used as fracture benchmark.
Heijn van Gent and Janos L. Urai
Solid Earth, 11, 513–526, https://doi.org/10.5194/se-11-513-2020, https://doi.org/10.5194/se-11-513-2020, 2020
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Faults form due to stresses caused by crustal processes. As faults influence the stress field locally, fault interaction leads to local variations in the stress field, but this is difficult to observe directly.
We describe an outcrop of one fault abuting into another one. By careful measurement of structures in the overlapping deformation zones and separating them using published relative age data, we show a rotation in the local stress field resulting from the faults growing to each other
Christopher Weismüller, Janos L. Urai, Michael Kettermann, Christoph von Hagke, and Klaus Reicherter
Solid Earth, 10, 1757–1784, https://doi.org/10.5194/se-10-1757-2019, https://doi.org/10.5194/se-10-1757-2019, 2019
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We use drones to study surface geometries of massively dilatant faults (MDFs) in Iceland, with apertures up to tens of meters at the surface. Based on throw, aperture and structures, we define three geometrically different endmembers of the surface expression of MDFs and show that they belong to one continuum. The transition between the endmembers is fluent and can change at one fault over short distances, implying less distinct control of deeper structures on surface geometries than expected.
Mark G. Rowan, Janos L. Urai, J. Carl Fiduk, and Peter A. Kukla
Solid Earth, 10, 987–1013, https://doi.org/10.5194/se-10-987-2019, https://doi.org/10.5194/se-10-987-2019, 2019
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Ancient evaporite sequences were deposited as interlayered rocksalt, other evaporites, and non-evaporite rocks that have enormous differences in strength. Whereas the ductile layers flow during deformation, strong layers are folded and/or torn apart, with the intrasalt deformation dependent on the mode and history of salt tectonics. This has important implications for accurately imaging and interpreting subsurface seismic data and for drilling wells through evaporite sequences.
Ismay Vénice Akker, Josef Kaufmann, Guillaume Desbois, Jop Klaver, Janos L. Urai, Alfons Berger, and Marco Herwegh
Solid Earth, 9, 1141–1156, https://doi.org/10.5194/se-9-1141-2018, https://doi.org/10.5194/se-9-1141-2018, 2018
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We studied porosity changes of slates from eastern Switzerland, which were deposited in an ocean in front of the emerging Alps during the Cenozoic. The Alpine collision between the European and African plates brought the rocks from this basin to today’s position in the Alps. From the basin to the surface, the porosity first decreased down to a small number of round cavities (<1 vol%) to microfractures, and once at the surface, the porosity increased again due to the formation of macro-fractures.
Simon Virgo, Christoph von Hagke, and Janos L. Urai
Solid Earth, 9, 91–113, https://doi.org/10.5194/se-9-91-2018, https://doi.org/10.5194/se-9-91-2018, 2018
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The marbles of the migmatitic dome on the island Naxos contain deformed layers of amphibolite with multiple phases of boudinage. The boudins formed by E–W shortening normal to the layers and layer parallel extension in various directions. We identified five different generations of boudins that show that E–W shortening is the prevalent deformation in these rocks during the peak metamorphosis and the following cooling, different from other parts of the island dominated by top-to-north shearing.
Ben Laurich, Janos L. Urai, Christian Vollmer, and Christophe Nussbaum
Solid Earth, 9, 1–24, https://doi.org/10.5194/se-9-1-2018, https://doi.org/10.5194/se-9-1-2018, 2018
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In Switzerland, the Opalinus Clay (OPA) formation is favored to host a repository for nuclear waste. Thus, we must know its deformation behavior. In this study, we focused on the microstructure of gouge, a thin (< 2 cm), drastically strained clay layer at the so-called Main Fault in the Mont Terri rock laboratory. We suggest that in situ gouge deforms in a more viscous manner than undeformed OPA in laboratory conditions. Moreover, we speculate about the origin and evolution of the gouge layer.
Guillaume Desbois, Nadine Höhne, Janos L. Urai, Pierre Bésuelle, and Gioacchino Viggiani
Solid Earth, 8, 291–305, https://doi.org/10.5194/se-8-291-2017, https://doi.org/10.5194/se-8-291-2017, 2017
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This work integrates measurements of the mechanical and transport properties with microstructures to understand deformation mechanisms in cemented mudrock. Cataclastic mechanisms are dominant down to nanometre scale. At low strain the fabric contains recognizable open fractures, while at high strain the reworked clay gouge shows resealing of initial fracture porosity. In the future, it will provide a microphysical basis for constitutive models to improve their extrapolation for long timescales.
Ben Laurich, Janos L. Urai, and Christophe Nussbaum
Solid Earth, 8, 27–44, https://doi.org/10.5194/se-8-27-2017, https://doi.org/10.5194/se-8-27-2017, 2017
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Scaly clay is a well-known rock fabric that can develop in tectonic systems and that can alter the physical rock properties of a formation. However, the internal microstructure and evolution of this fabric remain poorly understood. We examined the scaly microstructure of progressively faulted Opalinus Clay using optical as well as scanning electron microscopy. We show that as little as 1 vol.% in scaly clay aggregates is strained and present an evolutionary model for this.
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Adam J. Cawood, Hannah Watkins, Clare E. Bond, Marian J. Warren, and Mark A. Cooper
Solid Earth, 14, 1005–1030, https://doi.org/10.5194/se-14-1005-2023, https://doi.org/10.5194/se-14-1005-2023, 2023
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Here we test conceptual models of fracture development by investigating fractures across multiple scales. We find that most fractures increase in abundance towards the fold hinge, and we interpret these as being fold related. Other fractures at the site show inconsistent orientations and are unrelated to fold formation. Our results show that predicting fracture patterns requires the consideration of multiple geologic variables.
Johanna Heeb, David Healy, Nicholas E. Timms, and Enrique Gomez-Rivas
Solid Earth, 14, 985–1003, https://doi.org/10.5194/se-14-985-2023, https://doi.org/10.5194/se-14-985-2023, 2023
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Hydration of rocks is a key process in the Earth’s crust and mantle that is accompanied by changes in physical traits and mechanical behaviour of rocks. This study assesses the influence of stress on hydration reaction kinetics and mechanics in experiments on anhydrite. We show that hydration occurs readily under stress and results in localized hydration along fractures and mechanic weakening. New gypsum growth is selective and depends on the stress field and host anhydrite crystal orientation.
Roy Helge Gabrielsen, Panagiotis Athanasios Giannenas, Dimitrios Sokoutis, Ernst Willingshofer, Muhammad Hassaan, and Jan Inge Faleide
Solid Earth, 14, 961–983, https://doi.org/10.5194/se-14-961-2023, https://doi.org/10.5194/se-14-961-2023, 2023
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The Barents Shear Margin defines the border between the relatively shallow Barents Sea that is situated on a continental plate and the deep ocean. This margin's evolution history was probably influenced by plate tectonic reorganizations. From scaled experiments, we deduced several types of structures (faults, folds, and sedimentary basins) that help us to improve the understanding of the history of the opening of the North Atlantic.
Leslie Logan, Ervin Veress, Joel B. H. Andersson, Olof Martinsson, and Tobias E. Bauer
Solid Earth, 14, 763–784, https://doi.org/10.5194/se-14-763-2023, https://doi.org/10.5194/se-14-763-2023, 2023
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The Pahtohavare Cu ± Au deposits in the Kiruna mining district have a dubious timing of formation and have not been contextualized within an up-to-date tectonic framework. Structural mapping was carried out to reveal that the deposits are hosted in brittle structures that cut a noncylindrical, SE-plunging anticline constrained to have formed during the late-Svecokarelian orogeny. These results show that Cu ± Au mineralization formed more than ca. 80 Myr after iron oxide–apatite mineralization.
Alexandra Tamas, Dan M. Tamas, Gabor Tari, Csaba Krezsek, Alexandru Lapadat, and Zsolt Schleder
Solid Earth, 14, 741–761, https://doi.org/10.5194/se-14-741-2023, https://doi.org/10.5194/se-14-741-2023, 2023
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Tectonic processes are complex and often difficult to understand due to the limitations of surface or subsurface data. One such process is inversion tectonics, which means that an area initially developed in an extension (such as the opening of an ocean) is reversed to compression (the process leading to mountain building). In this research, we use a laboratory method (analogue modelling), and with the help of a sandbox, we try to better understand structures (folds/faults) related to inversion.
Elizabeth Parker Wilson, Pablo Granado, Pablo Santolaria, Oriol Ferrer, and Josep Anton Muñoz
Solid Earth, 14, 709–739, https://doi.org/10.5194/se-14-709-2023, https://doi.org/10.5194/se-14-709-2023, 2023
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This work focuses on the control of accommodation zones on extensional and subsequent inversion in salt-detached domains using sandbox analogue models. During extension, the transfer zone acts as a pathway for the movement of salt, changing the expected geometries. When inverted, the salt layer and syn-inversion sedimentation control the deformation style in the salt-detached cover system. Three natural cases are compared to the model results and show similar inversion geometries.
Oriol Ferrer, Eloi Carola, and Ken McClay
Solid Earth, 14, 571–589, https://doi.org/10.5194/se-14-571-2023, https://doi.org/10.5194/se-14-571-2023, 2023
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Using an experimental approach based on scaled sandbox models, this work aims to understand how salt above different rotational fault blocks influences the cover geometry and evolution, first during extension and then during inversion. The results show that inherited salt structures constrain contractional deformation. We show for the first time how welds and fault welds are reopened during contractional deformation, having direct implications for the subsurface exploration of natural resources.
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Solid Earth, 14, 551–570, https://doi.org/10.5194/se-14-551-2023, https://doi.org/10.5194/se-14-551-2023, 2023
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The Vinschgau Shear Zone (VSZ) is one of the largest and most significant shear zones developed within the Late Cretaceous thrust stack in the Austroalpine domain of the eastern Alps. 40Ar / 39Ar geochronology constrains the activity of the VSZ between 97 and 80 Ma. The decreasing vorticity towards the core of the shear zone, coupled with the younging of mylonites, points to a shear thinning behavior. The deepest units of the Eo-Alpine orogenic wedge were exhumed along the VSZ.
Jordi Miró, Oriol Ferrer, Josep Anton Muñoz, and Gianreto Manastchal
Solid Earth, 14, 425–445, https://doi.org/10.5194/se-14-425-2023, https://doi.org/10.5194/se-14-425-2023, 2023
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Using the Asturian–Basque–Cantabrian system and analogue (sandbox) models, this work focuses on the linkage between basement-controlled and salt-decoupled domains and how deformation is accommodated between the two during extension and subsequent inversion. Analogue models show significant structural variability in the transitional domain, with oblique structures that can be strongly modified by syn-contractional sedimentation. Experimental results are consistent with the case study.
Junichi Fukuda, Takamoto Okudaira, and Yukiko Ohtomo
Solid Earth, 14, 409–424, https://doi.org/10.5194/se-14-409-2023, https://doi.org/10.5194/se-14-409-2023, 2023
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We measured water distributions in deformed quartz by infrared spectroscopy mapping and used the results to discuss changes in water distribution resulting from textural development. Because of the grain size reduction process (dynamic recrystallization), water contents decrease from 40–1750 wt ppm in host grains of ~2 mm to 100–510 wt ppm in recrystallized regions composed of fine grains of ~10 µm. Our results indicate that water is released and homogenized by dynamic recrystallization.
Michael Rudolf, Matthias Rosenau, and Onno Oncken
Solid Earth, 14, 311–331, https://doi.org/10.5194/se-14-311-2023, https://doi.org/10.5194/se-14-311-2023, 2023
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Analogue models of tectonic processes rely on the reproduction of their geometry, kinematics and dynamics. An important property is fault behaviour, which is linked to the frictional characteristics of the fault gouge. This is represented by granular materials, such as quartz sand. In our study we investigate the time-dependent frictional properties of various analogue materials and highlight their impact on the suitability of these materials for analogue models focusing on fault reactivation.
Jessica Barabasch, Joyce Schmatz, Jop Klaver, Alexander Schwedt, and Janos L. Urai
Solid Earth, 14, 271–291, https://doi.org/10.5194/se-14-271-2023, https://doi.org/10.5194/se-14-271-2023, 2023
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We analysed Zechstein salt with microscopes and observed specific microstructures that indicate much faster deformation in rock salt with fine halite grains when compared to salt with larger grains. This is important because people build large cavities in the subsurface salt for energy storage or want to deposit radioactive waste inside it. When engineers and scientists use grain-size data and equations that include this mechanism, it will help to make better predictions in geological models.
Nicolás Molnar and Susanne Buiter
Solid Earth, 14, 213–235, https://doi.org/10.5194/se-14-213-2023, https://doi.org/10.5194/se-14-213-2023, 2023
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Progression of orogenic wedges over pre-existing extensional structures is common in nature, but deciphering the spatio-temporal evolution of deformation from the geological record remains challenging. Our laboratory experiments provide insights on how horizontal stresses are transferred across a heterogeneous crust, constrain which pre-shortening conditions can either favour or hinder the reactivatation of extensional structures, and explain what implications they have on critical taper theory.
Tania Habel, Martine Simoes, Robin Lacassin, Daniel Carrizo, and German Aguilar
Solid Earth, 14, 17–42, https://doi.org/10.5194/se-14-17-2023, https://doi.org/10.5194/se-14-17-2023, 2023
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The Central Andes are one of the most emblematic reliefs on Earth, but their western flank remains understudied. Here we explore two rare key sites in the hostile conditions of the Atacama desert to build cross-sections, quantify crustal shortening, and discuss the timing of this deformation at ∼20–22°S. We propose that the structures of the Western Andes accommodated significant crustal shortening here, but only during the earliest stages of mountain building.
Naïm Célini, Frédéric Mouthereau, Abdeltif Lahfid, Claude Gout, and Jean-Paul Callot
Solid Earth, 14, 1–16, https://doi.org/10.5194/se-14-1-2023, https://doi.org/10.5194/se-14-1-2023, 2023
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We investigate the peak temperature of sedimentary rocks of the SW Alps (France), using Raman spectroscopy on carbonaceous material. This method provides an estimate of the peak temperature achieved by organic-rich rocks. To determine the timing and the tectonic context of the origin of these temperatures we use 1D thermal modelling. We find that the high temperatures up to 300 °C were achieved during precollisional extensional events, not during tectonic burial in the Western Alps.
Pâmela Cristina Richetti, Frank Zwaan, Guido Schreurs, Renata S. Schmitt, and Timothy Chris Schmid
EGUsphere, https://doi.org/10.5194/egusphere-2022-1251, https://doi.org/10.5194/egusphere-2022-1251, 2022
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The Araripe Basin in NE Brazil was originally formed during Cretaceous times, as South America and Africa broke up. The basin is an important analogue to offshore South Atlantic break-up basins; its sediments were uplifted and are now found at a 1000 m height, allowing for study, but the cause of the uplift remains debated. Here we ran a series of tectonic laboratory experiments that show how a specific plate tectonic configuration can explain the evolution of the Araripe Basin.
Luke N. J. Wedmore, Tess Turner, Juliet Biggs, Jack N. Williams, Henry M. Sichingabula, Christine Kabumbu, and Kawawa Banda
Solid Earth, 13, 1731–1753, https://doi.org/10.5194/se-13-1731-2022, https://doi.org/10.5194/se-13-1731-2022, 2022
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Mapping and compiling the attributes of faults capable of hosting earthquakes are important for the next generation of seismic hazard assessment. We document 18 active faults in the Luangwa Rift, Zambia, in an active fault database. These faults are between 9 and 207 km long offset Quaternary sediments, have scarps up to ~30 m high, and are capable of hosting earthquakes from Mw 5.8 to 8.1. We associate the Molaza Fault with surface ruptures from two unattributed M 6+ 20th century earthquakes.
Michał P. Michalak, Lesław Teper, Florian Wellmann, Jerzy Żaba, Krzysztof Gaidzik, Marcin Kostur, Yuriy P. Maystrenko, and Paulina Leonowicz
Solid Earth, 13, 1697–1720, https://doi.org/10.5194/se-13-1697-2022, https://doi.org/10.5194/se-13-1697-2022, 2022
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When characterizing geological/geophysical surfaces, various geometric attributes are calculated, such as dip angle (1D) or dip direction (2D). However, the boundaries between specific values may be subjective and without optimization significance, resulting from using default color palletes. This study proposes minimizing cosine distance among within-cluster observations to detect 3D anomalies. Our results suggest that the method holds promise for identification of megacylinders or megacones.
Erik M. Young, Christie D. Rowe, and James D. Kirkpatrick
Solid Earth, 13, 1607–1629, https://doi.org/10.5194/se-13-1607-2022, https://doi.org/10.5194/se-13-1607-2022, 2022
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Studying how earthquakes spread deep within the faults they originate from is crucial to improving our understanding of the earthquake process. We mapped preserved ancient earthquake surfaces that are now exposed in South Africa and studied their relationship with the shape and type of rocks surrounding them. We determined that these surfaces are not random and are instead associated with specific kinds of rocks and that their shape is linked to the evolution of the faults in which they occur.
Sivaji Lahiri, Kitty L. Milliken, Peter Vrolijk, Guillaume Desbois, and Janos L. Urai
Solid Earth, 13, 1513–1539, https://doi.org/10.5194/se-13-1513-2022, https://doi.org/10.5194/se-13-1513-2022, 2022
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Understanding the mechanism of mechanical compaction is important. Previous studies on mechanical compaction were mostly done by performing experiments. Studies on natural rocks are rare due to compositional heterogeneity of the sedimentary succession with depth. Due to remarkable similarity in composition and grain size, the Sumatra subduction complex provides a unique opportunity to study the micromechanism of mechanical compaction on natural samples.
Dongwon Lee, Nikolaos Karadimitriou, Matthias Ruf, and Holger Steeb
Solid Earth, 13, 1475–1494, https://doi.org/10.5194/se-13-1475-2022, https://doi.org/10.5194/se-13-1475-2022, 2022
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This research article focuses on filtering and segmentation methods employed in high-resolution µXRCT studies for crystalline rocks, bearing fractures, or fracture networks, of very small aperture. Specifically, we focus on the identification of artificially induced (via quenching) fractures in Carrara marble samples. Results from the same dataset from all five different methods adopted were produced and compared with each other in terms of their output quality and time efficiency.
Alberto Ceccato, Giulia Tartaglia, Marco Antonellini, and Giulio Viola
Solid Earth, 13, 1431–1453, https://doi.org/10.5194/se-13-1431-2022, https://doi.org/10.5194/se-13-1431-2022, 2022
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The Earth's surface is commonly characterized by the occurrence of fractures, which can be mapped, and their can be geometry quantified on digital representations of the surface at different scales of observation. Here we present a series of analytical and statistical tools, which can aid the quantification of fracture spatial distribution at different scales. In doing so, we can improve our understanding of how fracture geometry and geology affect fluid flow within the fractured Earth crust.
Giulio Viola, Giovanni Musumeci, Francesco Mazzarini, Lorenzo Tavazzani, Manuel Curzi, Espen Torgersen, Roelant van der Lelij, and Luca Aldega
Solid Earth, 13, 1327–1351, https://doi.org/10.5194/se-13-1327-2022, https://doi.org/10.5194/se-13-1327-2022, 2022
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A structural-geochronological approach helps to unravel the Zuccale Fault's architecture. By mapping its internal structure and dating some of its fault rocks, we constrained a deformation history lasting 20 Myr starting at ca. 22 Ma. Such long activity is recorded by now tightly juxtaposed brittle structural facies, i.e. different types of fault rocks. Our results also have implications on the regional evolution of the northern Apennines, of which the Zuccale Fault is an important structure.
Wan-Lin Hu
Solid Earth, 13, 1281–1290, https://doi.org/10.5194/se-13-1281-2022, https://doi.org/10.5194/se-13-1281-2022, 2022
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Having a seismic image is generally expected to enable us to better determine fault geometry and thus estimate geological slip rates accurately. However, the process of interpreting seismic images may introduce unintended uncertainties, which have not yet been widely discussed. Here, a case of a shear fault-bend fold in the frontal Himalaya is used to demonstrate how differences in interpretations can affect the following estimates of slip rates and dependent conclusions.
Manuel D. Menzel, Janos L. Urai, Estibalitz Ukar, Thierry Decrausaz, and Marguerite Godard
Solid Earth, 13, 1191–1218, https://doi.org/10.5194/se-13-1191-2022, https://doi.org/10.5194/se-13-1191-2022, 2022
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Mantle rocks can bind large quantities of carbon by reaction with CO2, but this capacity requires fluid pathways not to be clogged by carbonate. We studied mantle rocks from Oman to understand the mechanisms allowing their transformation into carbonate and quartz. Using advanced imaging techniques, we show that abundant veins were essential fluid pathways driving the reaction. Our results show that tectonic stress was important for fracture opening and a key ingredient for carbon fixation.
Jean-Baptiste P. Koehl, Steffen G. Bergh, and Arthur G. Sylvester
Solid Earth, 13, 1169–1190, https://doi.org/10.5194/se-13-1169-2022, https://doi.org/10.5194/se-13-1169-2022, 2022
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The San Andreas fault is a major active fault associated with ongoing earthquake sequences in southern California. The present study investigates the development of the Indio Hills area in the Coachella Valley along the main San Andreas fault and the Indio Hills fault. The Indio Hills area is located near an area with high ongoing earthquake activity (Brawley seismic zone), and, therefore, its recent tectonic evolution has implications for earthquake prediction.
Jin Lai, Dong Li, Yong Ai, Hongkun Liu, Deyang Cai, Kangjun Chen, Yuqiang Xie, and Guiwen Wang
Solid Earth, 13, 975–1002, https://doi.org/10.5194/se-13-975-2022, https://doi.org/10.5194/se-13-975-2022, 2022
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(1) Structural diagenesis analysis is performed on the ultra-deep tight sandstone. (2) Fracture and intergranular pores are related to the low in situ stress magnitudes. (3) Dissolution is associated with the presence of fracture.
Hamed Fazlikhani, Wolfgang Bauer, and Harald Stollhofen
Solid Earth, 13, 393–416, https://doi.org/10.5194/se-13-393-2022, https://doi.org/10.5194/se-13-393-2022, 2022
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Interpretation of newly acquired FRANKEN 2D seismic survey data in southeeastern Germany shows that upper Paleozoic low-grade metasedimentary rocks and possible nappe units are transported by Variscan shear zones to ca. 65 km west of the Franconian Fault System (FFS). We show that the locations of post-Variscan upper Carboniferous–Permian normal faults and associated graben and half-graben basins are controlled by the geometry of underlying Variscan shear zones.
Xiaodong Ma, Marian Hertrich, Florian Amann, Kai Bröker, Nima Gholizadeh Doonechaly, Valentin Gischig, Rebecca Hochreutener, Philipp Kästli, Hannes Krietsch, Michèle Marti, Barbara Nägeli, Morteza Nejati, Anne Obermann, Katrin Plenkers, Antonio P. Rinaldi, Alexis Shakas, Linus Villiger, Quinn Wenning, Alba Zappone, Falko Bethmann, Raymi Castilla, Francisco Seberto, Peter Meier, Thomas Driesner, Simon Loew, Hansruedi Maurer, Martin O. Saar, Stefan Wiemer, and Domenico Giardini
Solid Earth, 13, 301–322, https://doi.org/10.5194/se-13-301-2022, https://doi.org/10.5194/se-13-301-2022, 2022
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Questions on issues such as anthropogenic earthquakes and deep geothermal energy developments require a better understanding of the fractured rock. Experiments conducted at reduced scales but with higher-resolution observations can shed some light. To this end, the BedrettoLab was recently established in an existing tunnel in Ticino, Switzerland, with preliminary efforts to characterize realistic rock mass behavior at the hectometer scale.
Berit Schwichtenberg, Florian Fusseis, Ian B. Butler, and Edward Andò
Solid Earth, 13, 41–64, https://doi.org/10.5194/se-13-41-2022, https://doi.org/10.5194/se-13-41-2022, 2022
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Hydraulic rock properties such as porosity and permeability are relevant factors that have an impact on groundwater resources, geological repositories and fossil fuel reservoirs. We investigate the influence of chemical compaction upon the porosity evolution in salt–biotite mixtures and related transport length scales by conducting laboratory experiments in combination with 4-D analysis. Our observations invite a renewed discussion of the effect of sheet silicates on chemical compaction.
David Healy and Stephen Paul Hicks
Solid Earth, 13, 15–39, https://doi.org/10.5194/se-13-15-2022, https://doi.org/10.5194/se-13-15-2022, 2022
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The energy transition requires operations in faulted rocks. To manage the technical challenges and public concern over possible induced earthquakes, we need to quantify the risks. We calculate the probability of fault slip based on uncertain inputs, stresses, fluid pressures, and the mechanical properties of rocks in fault zones. Our examples highlight the specific gaps in our knowledge. Citizen science projects could produce useful data and include the public in the discussions about hazards.
Manuel I. de Paz-Álvarez, Thomas G. Blenkinsop, David M. Buchs, George E. Gibbons, and Lesley Cherns
Solid Earth, 13, 1–14, https://doi.org/10.5194/se-13-1-2022, https://doi.org/10.5194/se-13-1-2022, 2022
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We describe a virtual geological mapping course implemented in response to travelling and social restrictions derived from the ongoing COVID-19 pandemic. The course was designed to replicate a physical mapping exercise as closely as possible with the aid of real field data and photographs collected by the authors during previous years in the Cantabrian Zone (NW Spain). The course is delivered through Google Earth via a KMZ file with outcrop descriptions and links to GitHub-hosted photographs.
Yueyang Xia, Jacob Geersen, Dirk Klaeschen, Bo Ma, Dietrich Lange, Michael Riedel, Michael Schnabel, and Heidrun Kopp
Solid Earth, 12, 2467–2477, https://doi.org/10.5194/se-12-2467-2021, https://doi.org/10.5194/se-12-2467-2021, 2021
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The 2 June 1994 Java tsunami earthquake ruptured in a seismically quiet subduction zone and generated a larger-than-expected tsunami. Here, we re-process a seismic line across the rupture area. We show that a subducting seamount is located up-dip of the mainshock in a region that did not rupture during the earthquake. Seamount subduction modulates the topography of the marine forearc and acts as a seismic barrier in the 1994 earthquake rupture.
Steffen Abe and Hagen Deckert
Solid Earth, 12, 2407–2424, https://doi.org/10.5194/se-12-2407-2021, https://doi.org/10.5194/se-12-2407-2021, 2021
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We use numerical simulations and laboratory experiments on rock samples to investigate how stress conditions influence the geometry and roughness of fracture surfaces. The roughness of the surfaces was analyzed in terms of absolute roughness and scaling properties. The results show that the surfaces are self-affine but with different scaling properties between the numerical models and the real rock samples. Results suggest that stress conditions have little influence on the surface roughness.
Chao Deng, Rixiang Zhu, Jianhui Han, Yu Shu, Yuxiang Wu, Kefeng Hou, and Wei Long
Solid Earth, 12, 2327–2350, https://doi.org/10.5194/se-12-2327-2021, https://doi.org/10.5194/se-12-2327-2021, 2021
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This study uses seismic reflection data to interpret the geometric relationship and evolution of intra-basement and rift-related structures in the Enping sag in the northern South China Sea. Our observations suggest the primary control of pre-existing thrust faults is the formation of low-angle normal faults, with possible help from low-friction materials, and the significant role of pre-existing basement thrust faults in fault geometry, paleotopography, and syn-rift stratigraphy of rift basins.
Sonia Yeung, Marnie Forster, Emmanuel Skourtsos, and Gordon Lister
Solid Earth, 12, 2255–2275, https://doi.org/10.5194/se-12-2255-2021, https://doi.org/10.5194/se-12-2255-2021, 2021
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We do not know when the ancient Tethys Ocean lithosphere began to founder, but one clue can be found in subduction accreted tectonic slices, including Gondwanan basement terranes on the island of Ios, Cyclades, Greece. We propose a 250–300 km southwards jump of the subduction megathrust with a period of flat-slab subduction followed by slab break-off. The initiation and its subsequent rollback of a new subduction zone would explain the onset of Oligo–Miocene extension and accompanying magmatism.
Rahul Prabhakaran, Giovanni Bertotti, Janos Urai, and David Smeulders
Solid Earth, 12, 2159–2209, https://doi.org/10.5194/se-12-2159-2021, https://doi.org/10.5194/se-12-2159-2021, 2021
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Rock fractures are organized as networks with spatially varying arrangements. Due to networks' influence on bulk rock behaviour, it is important to quantify network spatial variation. We utilize an approach where fracture networks are treated as spatial graphs. By combining graph similarity measures with clustering techniques, spatial clusters within large-scale fracture networks are identified and organized hierarchically. The method is validated on a dataset with nearly 300 000 fractures.
Olivier Lacombe, Nicolas E. Beaudoin, Guilhem Hoareau, Aurélie Labeur, Christophe Pecheyran, and Jean-Paul Callot
Solid Earth, 12, 2145–2157, https://doi.org/10.5194/se-12-2145-2021, https://doi.org/10.5194/se-12-2145-2021, 2021
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This paper aims to illustrate how the timing and duration of contractional deformation associated with folding in orogenic forelands can be constrained by the dating of brittle mesostructures observed in folded strata. The study combines new and already published absolute ages of fractures to provide, for the first time, an educated discussion about the factors controlling the duration of the sequence of deformation encompassing layer-parallel shortening, fold growth, and late fold tightening.
Vincent Famin, Hugues Raimbourg, Muriel Andreani, and Anne-Marie Boullier
Solid Earth, 12, 2067–2085, https://doi.org/10.5194/se-12-2067-2021, https://doi.org/10.5194/se-12-2067-2021, 2021
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Sediments accumulated in accretionary prisms are deformed by the compression imposed by plate subduction. Here we show that deformation of the sediments transforms some minerals in them. We suggest that these mineral transformations are due to the proliferation of microorganisms boosted by deformation. Deformation-enhanced microbial proliferation may change our view of sedimentary and tectonic processes in subduction zones.
Marta Adamuszek, Dan M. Tămaş, Jessica Barabasch, and Janos L. Urai
Solid Earth, 12, 2041–2065, https://doi.org/10.5194/se-12-2041-2021, https://doi.org/10.5194/se-12-2041-2021, 2021
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We analyse folded multilayer sequences in the Ocnele Mari salt mine (Romania) to gain insight into the long-term rheological behaviour of rock salt. Our results indicate the large role of even a small number of impurities in the rock salt for its effective mechanical behaviour. We demonstrate how the development of folds that occur at various scales can be used to constrain the viscosity ratio in the deformed multilayer sequence.
Dario Zampieri, Paola Vannoli, and Pierfrancesco Burrato
Solid Earth, 12, 1967–1986, https://doi.org/10.5194/se-12-1967-2021, https://doi.org/10.5194/se-12-1967-2021, 2021
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The long-lived Schio-Vicenza Fault System is a major shear zone cross-cutting the foreland and the thrust belt of the eastern southern Alps. We review 150 years of scientific works and explain its activity and kinematics, characterized by sinistral and dextral transcurrent motion along its southern and northern sections, respectively, by a geodynamic model that has the Adria indenter as the main actor and coherently reconciles the available geological and geophysical evidence collected so far.
Vincent F. Verwater, Eline Le Breton, Mark R. Handy, Vincenzo Picotti, Azam Jozi Najafabadi, and Christian Haberland
Solid Earth, 12, 1309–1334, https://doi.org/10.5194/se-12-1309-2021, https://doi.org/10.5194/se-12-1309-2021, 2021
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Balancing along geological cross sections reveals that the Giudicarie Belt comprises two kinematic domains. The SW domain accommodated at least ~ 18 km Late Oligocene to Early Miocene shortening. Since the Middle Miocene, the SW domain experienced at least ~ 12–22 km shortening, whereas the NE domain underwent at least ~ 25–35 km. Together, these domains contributed to ~ 40–47 km of sinistral offset of the Periadriatic Fault along the Northern Giudicarie Fault since the Late Oligocene.
Emma A. H. Michie, Mark J. Mulrooney, and Alvar Braathen
Solid Earth, 12, 1259–1286, https://doi.org/10.5194/se-12-1259-2021, https://doi.org/10.5194/se-12-1259-2021, 2021
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Generating an accurate model of the subsurface is crucial when assessing a site for CO2 storage, particularly for a fault-bound storage site that may act as a seal or could reactivate upon CO2 injection. However, we have shown how picking strategy, i.e. line spacing, chosen to create the model significantly influences any subsequent fault analyses but is surprisingly rarely discussed. This analysis has been performed on the Vette Fault bounding the Smeaheia potential CO2 storage site.
David J. Anastasio, Frank J. Pazzaglia, Josep M. Parés, Kenneth P. Kodama, Claudio Berti, James A. Fisher, Alessandro Montanari, and Lorraine K. Carnes
Solid Earth, 12, 1125–1142, https://doi.org/10.5194/se-12-1125-2021, https://doi.org/10.5194/se-12-1125-2021, 2021
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The anisotropy of magnetic susceptibility (AMS) technique provides an effective way to interpret deforming mountain belts. In both the Betics, Spain, and Apennines, Italy, weak but well-organized AMS fabrics were recovered from young unconsolidated and unburied rocks that could not be analyzed with more traditional methods. Collectively, these studies demonstrate the novel ways that AMS can be combined with other data to resolve earthquake hazards in space and time.
Stefano Urbani, Guido Giordano, Federico Lucci, Federico Rossetti, and Gerardo Carrasco-Núñez
Solid Earth, 12, 1111–1124, https://doi.org/10.5194/se-12-1111-2021, https://doi.org/10.5194/se-12-1111-2021, 2021
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Structural studies in active calderas have a key role in the exploration of geothermal systems. We reply in detail to the points raised by the comment of Norini and Groppelli (2020), strengthening the relevance of our structural fieldwork for geothermal exploration and exploitation in active caldera geothermal systems including the Los Humeros caldera.
Jakob Bolz and Jonas Kley
Solid Earth, 12, 1005–1024, https://doi.org/10.5194/se-12-1005-2021, https://doi.org/10.5194/se-12-1005-2021, 2021
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To assess the role smaller graben structures near the southern edge of the Central European Basin System play in the basin’s overall deformational history, we take advantage of a feature found on some of these structures, where slivers from older rock units appear along the graben's main fault, surrounded on both sides by younger strata. The implications for the geometry of the fault provide a substantially improved estimate for the magnitude of normal and thrust motion along the fault system.
Domingo G. A. M. Aerden, Alejandro Ruiz-Fuentes, Mohammad Sayab, and Aidan Forde
Solid Earth, 12, 971–992, https://doi.org/10.5194/se-12-971-2021, https://doi.org/10.5194/se-12-971-2021, 2021
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We studied the geometry of foliations and microfolds preserved within metamorphic garnet crystals using X-ray tomography. The studied rocks are blueschists from Ile de Groix formed during Late Devonian subduction of Gondwana under Armorica. Several sets of differently oriented microfabrics were found recording variations in the direction of subduction. Comparison with similar data for Iberia supports that Iberia rotated only 10–20° during the Cretaceous opening of the North Atlantic.
Alessandro Tibaldi, Noemi Corti, Emanuela De Beni, Fabio Luca Bonali, Susanna Falsaperla, Horst Langer, Marco Neri, Massimo Cantarero, Danilo Reitano, and Luca Fallati
Solid Earth, 12, 801–816, https://doi.org/10.5194/se-12-801-2021, https://doi.org/10.5194/se-12-801-2021, 2021
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The Northeast Rift of Mt Etna is affected by ground deformation linked to gravity sliding of the volcano flank and dike injection. Drone surveys show that the rift is affected by NE-striking extensional fractures and normal faults. Given an age of 1614 CE for the offset lavas, we obtained an extension rate of 1.9 cm yr−1 for the last 406 years. The stress field is characterised by a NW–SE σHmin. Drone surveys allow us to quickly collect data with a resolution of 2–3 cm.
Matteo Demurtas, Steven A.F. Smith, Elena Spagnuolo, and Giulio Di Toro
Solid Earth, 12, 595–612, https://doi.org/10.5194/se-12-595-2021, https://doi.org/10.5194/se-12-595-2021, 2021
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We performed shear experiments on calcite–dolomite gouge mixtures to better understand the behaviour of carbonates during sub-seismic to seismic deformation in the shallow crust. The development of a foliation in the gouge was only restricted to coseismic sliding, whereas fluidisation occurred over a wide range of slip velocities (sub-seismic to coseismic) in the presence of water. These observations will contribute to a better interpretation of the rock record.
James Gilgannon, Marius Waldvogel, Thomas Poulet, Florian Fusseis, Alfons Berger, Auke Barnhoorn, and Marco Herwegh
Solid Earth, 12, 405–420, https://doi.org/10.5194/se-12-405-2021, https://doi.org/10.5194/se-12-405-2021, 2021
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Using experiments that simulate deep tectonic interfaces, known as viscous shear zones, we found that these zones spontaneously develop periodic sheets of small pores. The presence of porous layers in deep rocks undergoing tectonic deformation is significant because it requires a change to the current model of how the Earth deforms. Emergent porous layers in viscous rocks will focus mineralising fluids and could lead to the seismic failure of rocks that are never supposed to have this occur.
Cited articles
Abe, S., Urai, J. L., and Kettermann, M.: Fracture patterns in nonplane
strain boudinage-insights from 3-D discrete element models, J. Geophys. Res.-Sol. Ea., 118, 1304–1315, https://doi.org/10.1002/jgrb.50126, 2013.
Albertz, M. and Ings, S. J.: Some consequences of mechanical
stratification in basin-scale numerical models of passive-margin salt
tectonics, Geol. Soc. London, Spec. Publ. 363, 303–330,
https://doi.org/10.1144/SP363.14, 2012.
Albertz, M., Beaumont, C., Shimeld, J. W., Ings, S. J., and Gradmann, S.: An
investigation of salt tectonic structural styles in the Scotian Basin,
offshore Atlantic Canada: 1. Comparison of observations with geometrically
simple numerical models, Tectonics, 29, TC4017, https://doi.org/10.1029/2009TC002539, 2010.
Behlau, J. and Mingerzahn, G.: Geological and tectonic investigations in
the former Morsleben salt mine (Germany) as a basis for the safety
assessment of a radioactive waste repository, Eng. Geol., 61, 83–97,
https://doi.org/10.1016/S0013-7952(01)00038-2, 2001.
Biehl, B. C., Reuning, L., Strozyk, F., and Kukla, P. A.: Origin and
deformation of intra-salt sulphate layers: an example from the Dutch
Zechstein (Late Permian), Int. J. Earth Sci. 103, 697–712,
https://doi.org/10.1007/s00531-014-0999-4, 2014.
Borchert, H. and Muir, R.: Salt deposits: the origin, metamorphism and
deformation of evaporites, D. Van Nostrand Company Ltd, London, 338 pp., 1964.
Bornemann, O. and Fischbeck, R.: Zur geologie des salzstocks Gorleben
nach den Bohrergebnissen, Deutschland Bundesamt für Strahlenschutz,
Salzgitter, 65 pp., 1991.
Bornemann, O., Behlau, J., Fischbeck, R., Hammer, J., Jaritz, W., Keller,
S., Mingerzahn, G., and Schramm, M.: Projekt Gorleben,
Standortbeschreibung Gorleben, Teil 3: Ergebnisse der über- und untertägigen Erkundung des Salinars,
Geologisches Jahrbuch. Bundesanstalt für
Geowissenschaften und Rohstoffe (BGR), Hannover, 211 pp., 2008.
Brun, J. P. and Mauduit, T. P. O.: Salt rollers: Structure and kinematics
from analogue modelling, Mar. Pet. Geol., 26, 249–258,
https://doi.org/10.1016/j.marpetgeo.2008.02.002, 2009.
Burliga, S.: Kinematics within the Klodawa salt diapir, central
Poland, Geol. Soc. London, Spec. Publ., 100, 11–21,
https://doi.org/10.1144/GSL.SP.1996.100.01.02, 1996.
Cartwright, J., Jackson, M. P. A., Dooley, T., and Higgins, S.: Strain
partitioning in gravity-driven shortening of a thick, multilayered evaporite
sequence, Geol. Soc. London, Spec. Publ. 363, 449–470, https://doi.org/10.1144/SP363.21, 2012.
Cerqueira, R. M., Chaves, A. P. V., Pessoa, A. F. C., Monteiro, J. L. A., Pereira,
J. C., and Wanderley, M. L.: Principais depositos minerais do Brasil, in:
Rochas E Minerais Industriais, Pricipal Mineral Deposits of Brazil, v. 4,
Industrial Rocks and Minerals ,Brasilia, Brazil Departamento Nacional de
Producao Mineral, 277–312, 1997.
Chemia, Z., Koyi, H., and Schmeling, H.: Numerical modelling of rise and
fall of a dense layer in salt diapirs, Geophys. J. Int., 172, 798–816,
https://doi.org/10.1111/j.1365-246X.2007.03661.x, 2008.
Chemia, Z., Schmeling, H., and Koyi, H.: The effect of the salt viscosity
on future evolution of the Gorleben salt diapir, Germany, Tectonophysics,
473, 446–456, https://doi.org/10.1016/j.tecto.2009.03.027, 2009.
De Jager, J.: Geological development, in: Geology of the Netherlands, edited by: Wong, T. E., Batjes, D. A.
J., and
De Jager, J., Royal Netherlands Academy
of Arts and Sciences, 5–26, 2007.
Dooley, T. P., Jackson, M. P. A., Jackson, C. A.-L., Hudec, M. R., and Rodriguez,
C. R.: Enigmatic structures within salt walls of the Santos
Basin – Part 2: Mechanical explanation from physical modeling, J. Struct.
Geol., 75, 163–187, https://doi.org/10.1016/j.jsg.2015.01.009, 2015.
Fiduk, J. C. and Rowan, M. G.: Analysis of folding and deformation within
layered evaporites in Blocks BM-S-8 & -9, Santos Basin, Brazil. Geol.
Soc. London, Spec. Publ., 363, 471–487, https://doi.org/10.1144/SP363.22, 2012.
Fokker, P. A.: The behaviour of salt and salt caverns, Dissertation,
Delft University of Technology, 143 pp., 1995.
Gärtner, G., Stockmann, N., Fricke, H., and Wallmüller, R.:
Geological characterization of the Asse salt mine for mining, disposal of
radioactive waste, and proof of long-term safety, in: Reviews in Engineering
Geology Volume XIX: Deep Geologic Repositories, 41–52,
https://doi.org/10.1130/2008.4119(05), 2008.
Geluk, M. C.: Internal tectonics of salt structures, J. Seism. Explor.,
7, 237–250, 1998.
Geluk, M. C.: Triassic, in: Geology of the Netherlands, edited by: Wong, T. E., Batjes, D. A. J., De Jager, J., Royal Netherlands Academy of Arts and
Sciences, 85–106, 2007a.
Geluk, M. C.: Permian, in: Geology of the Netherlands, edited by: Wong, T. E., Batjes, D. A. J., and De Jager, J., Royal Netherlands Academy of Arts and
Sciences, 63–83, 2007b.
Geluk, M. C., Paar, W. A., and Fokker, P. A.: Salt, in: Geology of the Netherlands, Wong, T. E., Batjes,
D. A. J., and De Jager, J., Royal Netherlands
Academy of Arts and Sciences, 283–294, 2007.
Geluk, M. C., Röhling, H., and Brückner-Röhling, S.: Salt
occurrences in the Netherlands and Germany: new insights in the formation of
salt basins, in: Proceedings of the 8th World Salt
Symposium, edited by: Geertman, R. M., May 2000, The Hague, Elsevier, 126–131, 2000.
Goteti, R., Ings, S. J., and Beaumont, C.: Development of salt minibasins
initiated by sedimentary topographic relief, Earth Planet. Sci. Lett.,
339–340, 103–116, https://doi.org/10.1016/j.epsl.2012.04.045, 2012.
Hammer, J., Behlau, J., Mingerzahn, G., and Mertineit, M.: The mechanical
behavior and geometry of anhydrite layers in rock salt: Observations from
nature, in: Natural Analogues for Safety Cases of Repositories in Rock Salt
- “Salt Club” Workshop Proceedings Braunschweig, Germany, 05–07 September
2012, Hosted by Gesellschaft Für Anlagen Und Reaktorsicherheit (GRS)
mbH, Braunschweig and Project Management Agency, 2014.
Hudec, M. R. and Jackson, M. P. A.: Terra infirma: Understanding salt
tectonics, Earth-Science Rev., 82, 1–28, https://doi.org/10.1016/j.earscirev.2007.01.001, 2007.
Jackson, C. A.-L., Jackson, M. P. A., Hudec, M. R., and Rodriguez, C.:
Internal structure, kinematics, and growth of a salt wall: Insights from 3-D
seismic data, Geology, 42, 307–310, https://doi.org/10.1130/G34865.1, 2014.
Jackson, C. A.-L., Jackson, M. P. A., Hudec, M. R., and Rodriguez, C. R.:
Enigmatic structures within salt walls of the Santos Basin – Part 1:
Geometry and kinematics from 3-D seismic reflection and well data, J. Struct.
Geol., 75, 135–162, https://doi.org/10.1016/j.jsg.2015.01.010, 2015.
Jackson, M. P. A. and Talbot, C. J.: External shapes, strain rates, and
dynamics of salt structures, Geol. Soc. Am. Bull. 97, 305–323,
https://doi.org/10.1130/0016-710.1130/0016-7606(1986)97< 305:ESSRAD> 2.0.CO;2, 1986.
Jackson, M. P. A. and Talbot, C.: Anatomy of mushroom-shaped diapirs, J.
Struct. Geol., 11, 211–230, https://doi.org/10.1016/0191-8141(89)90044-8, 1989.
Jackson, M. P. A., Cornelius, R. R., Craig, C. H., Gansser, A., Stöcklin,
J., and Talbot, C. J.: Salt Diapirs of the Great Kavir, Central Iran,
Memoir of the Geological Society of America, https://doi.org/10.1130/MEM177, 1990.
Jackson, M. P. A., Roberts, D., and Snelson, S.: Salt Tectonics: A Global
Perspective: Based on the Hedberg International Research Conference, Bath,
UK, September 1993, No. 65, Amer Assn of Petroleum Geologists, Tulsa,
Oklahoma, 467 pp., 1996.
Koyi, H. A.: Modeling the influence of sinking anhydrite blocks on
salt diapirs targeted for hazardous waste disposal, Geology, 29, 387–390,
https://doi.org/10.1130/0091-7613(2001)029< 0387:MTIOSA> 2.0.CO;2, 2001.
Kukla, P., Pechnig, R., and Urai, J.: Analysis and evaluation of the
Gorleben site characteristics, Report on the working package 2, Preliminary
safety analysis Gorleben, Gesellschaft fuer Anlagen-und Reaktorsicherheit
mbH (GRS), Koeln (Germany), Funding organisation: Bundesministerium fuer
Umwelt, Naturschutz und Reaktorsicherheit, Berlin (Germany), ISBN
978-3-939355-52-6, 2011.
Langbein, R.: The Zechstein sulphates: The state of the art, in:
The Zechstein Facies in Europe, edited by: Peryt, T. M., Lecture Notes in Earth
Science, Vol. 10, Springer- Verlag Berlin, Heidelberg, 143–188, 1987.
Li, S., Abe, S., Reuning, L., Becker, S., Urai, J. L., and Kukla, P. A.:
Numerical modelling of the displacement and deformation of embedded rock
bodies during salt tectonics: A case study from the South Oman Salt Basin,
Geol. Soc. London, Spec. Publ., 363, 503–520, https://doi.org/10.1144/SP363.24, 2012a.
Li, S., Abe, S., Van Gent, H., Strozyk, F., Kukla, P. A., and Urai, J. L.:
A new method to evaluate the salt rheology during long term ceep by
inversion of numerical models of gravitational sinking of
carbonate-anhydrite inclusions (stringers) in salt, in: Proceedings of the
7th Conference on the Mechanical Behavior of Salt?, Saltmech7 Paris, 16–19
April 2012, 215–220, 2012b.
Liang, W., Yang, C., Zhao, Y., Dusseault, M. B., and Liu, J.: Experimental
investigation of mechanical properties of bedded salt rock, Int. J. Rock
Mech. Min. Sci., 44, 400–411, https://doi.org/10.1016/j.ijrmms.2006.09.007, 2007.
Lotze, F.: Steinsalz und kalisalze, Part I, in: Berlin: Gebruder
Borntrager, 446 pp., 1957.
Martini, H. J.: Salzsättel und Deckgebirge, in:
Frühjahrestagung “Salzlagerstätten” Der Deutschen Geologischen
Gesellschaft in Goslar, Mai 1953, 823–836, 1953.
Mohr, M., Kukla, P. A., Urai, J. L., and Bresser, G.: Multiphase salt
tectonic evolution in NW Germany: Seismic interpretation and
retro-deformation, Int. J. Earth Sci., 94, 917–940,
https://doi.org/10.1007/s00531-005-0039-5, 2005.
Müller, W. H., Schmid, S. M., and Briegel, U.: Deformation experiments
on anhydrite rocks of different grain sizes: Rheology and microfabric,
Tectonophysics, 78, 527–543, https://doi.org/10.1016/0040-1951(81)90027-5, 1981.
Poiate, E. J., Costa, A. M., Falcao, J. L., and Petrobrás, S. A.: Well
Design for Drilling Through Thick Evaporite Layers in Santos Basin- Brazil,
in: IADC/SPE Drilling Conference, 21–23 February 2006, Miami, Florida, USA,
Society of Petroleum Engineers, 16, https://doi.org/10.2523/99161-MS, 2006.
Schenk, O. and Urai, J. L.: The migration of fluid-filled grain boundaries
in recrystallizing synthetic bischofite: First results of in-situ
high-pressure, high-temperature deformation experiments in transmitted
light, J. Metamorph. Geol., 23, 695–709,
https://doi.org/10.1111/j.1525-1314.2005.00604.x, 2005.
Schléder, Z., Urai, J. L., Nollet, S., and Hilgers, C.:
Solution-precipitation creep and fluid flow in halite: A case study of
Zechstein (Z1) rocksalt from Neuhof salt mine (Germany), Int. J. Earth Sci.,
97, 1045–1056, https://doi.org/10.1007/s00531-007-0275-y, 2008.
Scott Duncan, E. J., and Lajtai, E. Z.: The creep of potash salt rocks from
Saskatchewan, Geotech. Geol. Eng., 11, 159–184, https://doi.org/10.1007/BF00531249, 1993.
Siemeister, G.: Primärparagenese und Metamorphose des
Ronnenberglagers nach Untersuchung im Grubenfeld Salzdetfurth, Beihefte zum
Geologischen Jahrbuch, Beiheft 62. Bundesanstalt für Bodenforschung,
Geologische Landesämter der Bundesrepublik Deutschland, Hannover, 122 pp., 1969.
Spiers, C. J., Urai, J. L., Lister, G. S., Boland, J. N., and Zwart, H. J.: The
influence of fluid-rock interaction on the rheology of salt rock and on
ionic transport in salt, Report over the period Nov. 1981–Dec. 1983, 131, 1983.
Strozyk, F., Van Gent, H., Urai, J. L., and Kukla, P. A.: 3-D seismic study
of complex intra-salt deformation: An example from the Upper Permian
Zechstein 3 stringer, western Dutch offshore, Geol. Soc. London, Spec. Publ.,
363, 489–501, https://doi.org/10.1144/SP363.23, 2012.
Strozyk, F., Urai, J. L., Gent, H. Van, Keijzer, M. De, and Kukla, P. A.:
The internal structure of salt?: insights from a regional 3-D seismic study
of the Permian Zechstein 3 intra-salt stringer in the Northern Netherlands
and its implications for salt tectonics, Interpretation 2, 101–117,
https://doi.org/10.1190/INT-2014-0037.1, 2014.
Talbot, C. J. and Aftabi, P.: Geology and models of salt extrusion at Qum
Kuh, central Iran, J. Geol. Soc. London., 161, 321–334,
https://doi.org/10.1144/0016-764903-102, 2004.
Urai, J. L.: Water assisted dynamic recrystallization and weakening in polycrystalline bischofite, Tectonophysics, 96, 125–157, https://doi.org/10.1016/0040-1951(83)90247-0, 1983.
Urai, J. L.: Water-enhanced dynamic recrystallization and solution transfer in experimentally deformed carnallite, Tectonophysics, 120, 285–317, https://doi.org/10.1016/0040-1951(85)90055-1, 1985.
Urai, J. L. and Boland, J. N.: Development of microstructures and the origin of hematite in naturally deformed carnallite, Neues Jahrb. für Mineral. H., 2, 58–72, 1985.
Urai, J. L., Spiers, C. J., Peach, C. J., Franssen, R. C. M. W., and Liezenberg, J. L.: Deformation mechanisms operating in naturally deformed halite, Geol. en Mijnb., 66, 165–176, 1987.
Urai, J. L., Schléder, Z., Spiers, C. J., Kukla, P. A., Lange, J.-M., and
Röhling, H.-G.: Flow and Transport Properties of Salt Rocks, in:
Dynamics of Complex Intracontinental Basins: The Central European Basin
System, Springer Science & Business Media, 277–290, 2008.
Vackiner, A. A., Antrett, P., Stollhofen, H., Back, S., Kukla, P. A., and
Bärle, C.: Syndepositional tectonic controls and palaeo-topography
of a permian tight gas reservoir in nw germany, J. Pet. Geol., 34, 411–428,
https://doi.org/10.1111/j.1747-5457.2011.00512.x, 2011.
van Eekelen, H. A., Urai, J. L., and Hulsebos, T.: Creep of Bischofite, in:
Proceedings, 1st Conference on the Mechanical Behaviour of Salt
Pennsylvania, 15 pp., 1981.
Van Gent, H., Urai, J. L., and de Keijzer, M.: The internal geometry of
salt structures – A first look using 3-D seismic data from the Zechstein of
the Netherlands, J. Struct. Geol., 33, 292–311,
https://doi.org/10.1016/j.jsg.2010.07.005, 2011.
Vysotskiy, E. A. and Kislik, V. Z.: Epochs of bischofite deposition in
geologic history, Int. Geol. Rev., 29, 134–139,
https://doi.org/10.1080/00206818709466130, 1987.
Warren, J. K.: Evaporites: Sediments, Resources and Hydrocarbons,
Springer Science & Business Media, Berlin Heidelberg, 1035 pp., 2006.
Williamson, M. D., Murray, S. J. J., Hamilton, T. A. P. A. P., Copland, M. A. A.,
Wil, M. D., Murray, S. J. J., Science, W. S. A., Hamilton, T. A. P. A. P., and Copland,
M. A. A.: A Review of Zechstein Drilling Issues, in: Offshore Europe
Conference in Aberdeen, Scotland, 9–12 September 1997, 189–196,
https://doi.org/10.2118/51182-PA, 1998.
Wong, T. E.: Jurassic, in: Geology of the Netherlands, edited by: Wong, T. E., Batjes, D. A. J., and De Jager,
J., Royal Netherlands Academy of Arts and
Sciences, 107–125, 2007a.
Wong, T. E.: Cretaceous, in: Geology of the Netherlands, edited by: Wong, T. E., Batjes, D. A. J., and De Jager, J.,
Royal Netherlands Academy of Arts and
Sciences, 127–150, 2007b.
Ziegler, P. A.: North-Western Europe: Tectonics and Basin Development,
Geol Mijnb, 57, 589–626, 1978.
Zirngast, M.: The development of the Gorleben salt dome (northwest
Germany) based on quantitative analysis of peripheral sinks, Geol. Soc.
London, Spec. Publ., 100, 203–226, https://doi.org/10.1144/GSL.SP.1996.100.01.13, 1996.
Zulauf, G., Zulauf, J., Bornemann, O., Brenker, F. E., Höfer, H. E.,
Peinl, M., and Woodland, A. B.: Experimental deformation of a single-layer
anhydrite in halite matrix under bulk constriction, Part 2: Deformation
mechanisms and the role of fluids, J. Struct. Geol., 32, 264–277,
https://doi.org/10.1016/j.jsg.2009.12.001, 2010.
Zulauf, J. and Zulauf, G.: Coeval folding and boudinage in four
dimensions, J. Struct. Geol., 27, 1061–1068, https://doi.org/10.1016/j.jsg.2005.04.003, 2005.
Short summary
3D seismic and well data were used to study the evolution of salt pillows with extreme mechanical stratification to gain a better understanding of layered evaporite deposits. During evaporation an active basement graben caused the local accumulation of thick K-Mg salts. The resulting structure after the following extensional and compressional salt flow was strongly influenced by folding of the ruptured ZIII-AC stringer, leading to thickening and internal deformation of the soft K-Mg salt layers.
3D seismic and well data were used to study the evolution of salt pillows with extreme...
