Articles | Volume 7, issue 3
https://doi.org/10.5194/se-7-857-2016
© 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-7-857-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
30 May 2016
Research article |
| 30 May 2016
Oblique collision and deformation partitioning in the SW Iberian Variscides
Departamento de Geodinámica, Facultad de Ciencias, Universidad
de Granada, Campus de Fuentenueva s/n, 18071 Granada, Spain
José Fernando Simancas
Departamento de Geodinámica, Facultad de Ciencias, Universidad
de Granada, Campus de Fuentenueva s/n, 18071 Granada, Spain
David Martínez Poyatos
Departamento de Geodinámica, Facultad de Ciencias, Universidad
de Granada, Campus de Fuentenueva s/n, 18071 Granada, Spain
Antonio Azor
Departamento de Geodinámica, Facultad de Ciencias, Universidad
de Granada, Campus de Fuentenueva s/n, 18071 Granada, Spain
Francisco González Lodeiro
Departamento de Geodinámica, Facultad de Ciencias, Universidad
de Granada, Campus de Fuentenueva s/n, 18071 Granada, Spain
Related authors
Irene Pérez-Cáceres, David Jesús Martínez Poyatos, Olivier Vidal, Olivier Beyssac, Fernando Nieto, José Fernando Simancas, Antonio Azor, and Franck Bourdelle
Solid Earth, 11, 469–488, https://doi.org/10.5194/se-11-469-2020, https://doi.org/10.5194/se-11-469-2020, 2020
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The metamorphism of the Pulo do Lobo unit (SW Iberian Massif) is described in this paper. To this end, three different and complementary methodologies have been applied. The new results reported here contribute to the knowledge of the metamorphic conditions of the Pulo do Lobo unit in relation to its deformation. Furthermore, the results are compared in order to assess the reliability of the different methods applied.
Puy Ayarza, José Ramón Martínez Catalán, Ana Martínez García, Juan Alcalde, Juvenal Andrés, José Fernando Simancas, Immaculada Palomeras, David Martí, Irene DeFelipe, Chris Juhlin, and Ramón Carbonell
Solid Earth, 12, 1515–1547, https://doi.org/10.5194/se-12-1515-2021, https://doi.org/10.5194/se-12-1515-2021, 2021
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Vertical incidence seismic profiling on the Iberian Massif images a mid-crustal-scale discontinuity at the top of the reflective lower crust. This feature shows that upper- and lower-crustal reflections merge into it, suggesting that it has often behaved as a detachment. The orogen-scale extension of this discontinuity, present in Gondwanan and Avalonian affinity terranes into the Iberian Massif, demonstrates its relevance, leading us to interpret it as the Conrad discontinuity.
Irene Pérez-Cáceres, David Jesús Martínez Poyatos, Olivier Vidal, Olivier Beyssac, Fernando Nieto, José Fernando Simancas, Antonio Azor, and Franck Bourdelle
Solid Earth, 11, 469–488, https://doi.org/10.5194/se-11-469-2020, https://doi.org/10.5194/se-11-469-2020, 2020
Short summary
Short summary
The metamorphism of the Pulo do Lobo unit (SW Iberian Massif) is described in this paper. To this end, three different and complementary methodologies have been applied. The new results reported here contribute to the knowledge of the metamorphic conditions of the Pulo do Lobo unit in relation to its deformation. Furthermore, the results are compared in order to assess the reliability of the different methods applied.
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Júlia Gómez-Romeu and Nick Kusznir
Solid Earth, 15, 477–492, https://doi.org/10.5194/se-15-477-2024, https://doi.org/10.5194/se-15-477-2024, 2024
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We investigate the extensional fault geometry and its evolution during the stretching and thinning of continental crust and lithosphere leading to continental breakup. We focus on the fault-controlled processes that thin and rupture the final 10 km of continental crust at magma-poor margins prior to mantle exhumation. We show that isostatic fault rotation in response to extension is fundamental to understanding the formation of tectonic structures observed on seismic reflection data.
Karsten Reiter, Oliver Heidbach, and Moritz O. Ziegler
Solid Earth, 15, 305–327, https://doi.org/10.5194/se-15-305-2024, https://doi.org/10.5194/se-15-305-2024, 2024
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It is generally assumed that faults have an influence on the stress state of the Earth’s crust. It is questionable whether this influence is still present far away from a fault. Simple numerical models were used to investigate the extent of the influence of faults on the stress state. Several models with different fault representations were investigated. The stress fluctuations further away from the fault (> 1 km) are very small.
Yukinojo Koyama, Simon R. Wallis, and Takayoshi Nagaya
Solid Earth, 15, 143–166, https://doi.org/10.5194/se-15-143-2024, https://doi.org/10.5194/se-15-143-2024, 2024
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Stress along a subduction plate boundary is important for understanding subduction phenomena such as earthquakes. We estimated paleo-stress using quartz recrystallized grain size combined with deformation temperature and P–T paths of exhumed rocks. The obtained results show differential stresses of 30.8–82.7 MPa consistent over depths of 17–27 km in the paleo-subduction boundary. The obtained stress may represent the initial conditions under which slow earthquakes nucleated in the same domain.
Annelotte Weert, Kei Ogata, Francesco Vinci, Coen Leo, Giovanni Bertotti, Jerome Amory, and Stefano Tavani
Solid Earth, 15, 121–141, https://doi.org/10.5194/se-15-121-2024, https://doi.org/10.5194/se-15-121-2024, 2024
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On the road to a sustainable planet, geothermal energy is considered one of the main substitutes when it comes to heating. The geological history of an area can have a major influence on the application of these geothermal systems, as demonstrated in the West Netherlands Basin. Here, multiple episodes of rifting and subsequent basin inversion have controlled the distribution of the reservoir rocks, thus influencing the locations where geothermal energy can be exploited.
Pâmela C. Richetti, Frank Zwaan, Guido Schreurs, Renata S. Schmitt, and Timothy C. Schmid
Solid Earth, 14, 1245–1266, https://doi.org/10.5194/se-14-1245-2023, https://doi.org/10.5194/se-14-1245-2023, 2023
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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 1000 m height, allowing for studies thereof, 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.
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.
Chiara Montemagni, Stefano Zanchetta, Martina Rocca, Igor M. Villa, Corrado Morelli, Volkmar Mair, and Andrea Zanchi
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.
Bastien Walter, Yves Géraud, Alexiane Favier, Nadjib Chibati, and Marc Diraison
EGUsphere, https://doi.org/10.5194/egusphere-2023-397, https://doi.org/10.5194/egusphere-2023-397, 2023
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Lake Abhe in southwestern Djibouti is known for its exposures of massive hydrothermal chimneys and hot springs on the lake’s eastern shore. This study highlights the control of the main structural faults of the area on the development of these hydrothermal features. This work contributes to better understand hydrothermal fluid pathways in this area and may help further exploration for the geothermal development of this remarkable site.
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.
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.
Cited articles
Abalos, B., Gil Ibarguchi, J. I., and Eguiluz, L.: Cadomian subduction/collision and Variscan transpression in the Badajoz-Córdoba shear belt, southwest Spain, Tectonophysics, 199, 51–72, 1991.
Araújo, A., Fonseca, P., Munhá, J., Moita, P., Pedro, J., and Ribeiro, A.: The Moura Phyllonitic Complex: An accretionary complex related with obduction in the southern Iberia Variscan suture, Geodin. Acta, 18, 375–388, 2005.
Azor, A., González Lodeiro, F., and Simancas, J. F.: Tectonic evolution of the boundary between the Central Iberian and Ossa-Morena zones (Variscan Belt, southwest Spain), Tectonics, 13, 45–61, 1994.
Azor, A., Rubatto, D., Simancas, J. F., González Lodeiro, F., Martínez Poyatos, D., Martín Parra, L. M., and Matas, J.: Rheic Ocean ophiolitic remnants in Southern Iberia questioned by SHRIMP U-Pb zircon ages on the Beja-Acebuches amphibolites, Tectonics, 27, TC5014, https://doi.org/10.1029/2009TC002527, 2008.
Bandrés, A., Eguíluz, L., Pin, C., Paquette, J. L., Ordóñez, B., Le Fèvre, B., Ortega, L. A., and Gil Ibarguchi, J. I.: The northern Ossa-Morena Cadomian batholith (Iberian Massif): magmatic arc origin and early evolution, Int. J. Earth Sci., 93, 860–885, 2004.
Bard, J. P.: Signification tectonique des métatholeites d'affinité abyssale de la ceinture de basse pression d'Aracena (Huelva, Espagne), Bulletin de la Société géologique de France, 19, 385–393, 1977.
Booth-Rea, G., Simancas, J. F., Azor, A., Azañón, J. M., Gonzalez Lodeiro, F., and Fonseca, P.: HP-LT Variscan metamorphism in the Cubito-Moura schists (Ossa-Morena Zone, southern Iberia), C. R. Geosci., 338, 1260–1267, 2006.
Braid, J. A., Murphy, J. B., and Quesada, C.: Structural analysis of an accretionary prism in a continental collisional setting, the Late Paleozoic Pulo do Lobo Zone, Southern Iberia, Gondwana Res., 17, 422–439, 2010.
Burg, J. P., Iglesias, M., Laurent, P., Matte, P., and Ribeiro, A.: Variscan intracontinental deformation: the Coimbra-Córdoba Shear zone (SW Iberian Peninsula), Tectonophysics, 78, 161–177, 1981.
Castro, A., Fernández, C., De la Rosa J. D., Moreno Ventas, I., and Rogers, G.: Significance of MORB-derived amphibolites from the Aracena metamorphic belt, southwest Spain, J. Petrol., 37, 235–260, 1996.
Castro, A., Fernández, C., El-Hmidi, H., El-Biad, M., Díaz-Azpiroz, M., De la Rosa, J., and Stuart, F.: Age constraints to the relationships between magmatism, metamorphism and tectonism in the Aracena metamorphic belt, southern Spain, Int. J. Earth Sci., 88, 26–37, 1999.
Crespo-Blanc, A.: Evolución geotectónica del contacto entre la zona de Ossa-Morena y la zona Surportuguesa en las sierras de Aracena y Aroche (Macizo Ibérico Meridional): Un contacto mayor en la cadena Hercínica Europea, Ph. D. Thesis, Univ. de Granada, 327 pp., 1991.
Crespo-Blanc, A.: Structure and kinematics of a sinistral transpressive suture between the Ossa-Morena and the South Portuguese Zones, South Iberian Massif, J. Geol. Soc. London, 149, 401–411, 1992.
Crespo-Blanc, A. and Orozco, M.: The southern Iberian shear zone: a major boundary in the Hercynian folded belt, Tectonophysics, 148, 221–227, 1988.
Czeck, D. M. and Hudleston, P. J.: Testing models for obliquely plunging lineations in transpression: a natural example and theoretical discussion, J. Struct. Geol., 25, 959–982, 2003.
Czeck, D. M. and Hudleston, P. J.: Physical experiment of vertical transpression with localized non vertical extrusion, J. Struct. Geol., 26, 573–581, 2004.
Dahn, D. R. L., Braid, J. A., Murphy, J. B., Quesada, C., Dupuis, N., and McFarlane, C. R. M.: Geochemistry of the Peramora Melange and Pulo do Lobo schist: geochemical investigation and tectonic interpretation of mafic melange in the Pangean suture zone, Southern Iberia, Int. J. Earth Sci., 103, 1415–1431, 2014.
Dallmeyer, R. D., Fonseca, P. E., Quesada, C., and Ribeiro, A.: 40Ar ∕ 39Ar Mineral age constraints for the Tectonothermal Evolution of a Variscan Suture in Southwest Iberia, Tectonophysics, 222, 177–194, 1993.
Dewey, J., Holdsworth, R. E., and Strachan, R. A.: Discussion on transpression and transtension zones, J. Geol. Soc. London, 156, 1048–1050, 1999.
Dias, R. and Ribeiro, A.: Constriction in a transpressive regime: an example in the Iberian branch of the Ibero-Armorican Arc, J. Struct. Geol., 16, 1545–1554, 1994.
Díaz-Azpiroz, M. and Fernández, C.: Kinematic analysis of the southern Iberian shear zone and tectonic evolution of the Acebuches metabasites (SW Variscan Iberian Massif), Tectonics, 24, TC3010, https://doi.org/10.1029/2004TC001682, 2005.
Dutton, B. J.: Finite strains in transpression zones with no boundary slip, J. Struct. Geol., 19, 1189–1200, 1997.
Eden, C. P.: Tectonostratigraphic analysis of the northern extent of the oceanic exotic terrane, Northwestern Huelva Province, Spain, Ph. D. Thesis, Univ. of Southampton, 214 pp., 1991.
Eden, C. P. and Andrews, J.: Middle to upper Devonian melanges in SW Spain and their relationship to the Meneage formation in south Cornwall, Proc. Ussher, 7, 217–222, 1990.
Ellis, M. A. and Watkinson, A. J: Reply on ”Orogen-parallel extension and oblique tectonics: The relation between stretching lineations and relative plate motions, Geology, 16, 857–861, 1988.
Expósito, I.: Evolución estructural de la mitad septentrional de la Zona de Ossa-Morena y su relación con el límite Zona de Ossa Morena/Zona Centroibérica, Ph. D. Thesis, Univ. de Granada, 296 pp., 2000.
Expósito, I., Simancas, J. F., González Lodeiro, F., Azor, A., and Martínez Poyatos, D.: Estructura de la mitad septentrional de la zona de Ossa-Morena: Deformación en el bloque inferior de un cabalgamiento cortical de evolución compleja, Revista de la Sociedad Geológica de España, 15, 3–14, 2002.
Fernández, C. and Díaz-Azpiroz, M.: Triclinic transpression zones with inclined extrusion, J. Struct. Geol., 31, 1225–1269, 2009.
Fernández, C., Czeck, D. M., and Díaz-Azpiroz, M.: Testing the model of oblique transpression with oblique extrusion in two natural cases: Steps and consequences, J. Struct. Geol., 54, 85–102, 2013.
Fonseca, P. and Ribeiro, A.: Tectonics of the Beja-Acebuches Ophiolite – a Major Suture in the Iberian Variscan Foldbelt, Geol. Rundsch., 82, 440–447, 1993.
Fonseca, P., Munhá, J., Pedro, J., Rosas, F., Moita, P., Araújo, A., and Leal, N.: Variscan ophiolites and high-pressure metamorphism in southern Iberia, Ofioliti, 24, 259–268, 1999.
Fossen, H. and Tikoff, B.: The deformation matrix for simultaneous simple shearing, pure shearing and volume change, and its application to transpression-transtension tectonics, J. Struct. Geol., 15, 413–422, 1993.
Franke, W.: The mid-European segment of the Variscides: Tectonostratigraphic units, terrane boundaries and plate tectonic evolution, in: Orogenic Processes: Quantification and Modelling in the Variscan Belt, edited by: Franke, W., Haak, V., Oncken, O., and Tanner, D., Geological Society of London Special Publications, 179, 35–61, 2000.
Gómez-Pugnaire, M. T., Azor, A., Fernández-Soler, J. M., and López Sánchez-Vizcaíno, V.: The amphibolites from the Ossa-Morena/Central Iberian Variscan suture (southwestern Iberian Massif): Geochemistry and tectonic interpretation, Lithos, 68, 23–42, 2003.
Harland, W. B.: Tectonic transpression in caledonian Spitsbergen, Geol. Mag., 108, 27–41. 1971.
Holdsworth, R. E. and Strachan, R. A.: Interlinked system of ductile strike slip and thrusting formed by Caledonian sinistral transpression in northeastern Greenland, Geology, 19, 510–513, 1991.
Jackson, P. and Sanderson, D. J.: Scaling of fault displacements from the Badajoz-Cordoba shear zone, SW Spain, Tectonophysics, 210, 179–190, 1992.
Jiang, D.: Sustainable transpression: An examination of strain and kinematics in deforming zones with migrating boundaries, J. Struct. Geol., 29, 1984–2005, 2007.
Jiang, D. and Williams, P. F.: High-strain zones: a unified model, J. Struct. Geol., 20, 1105–1120, 1998.
Jones, R. R., Holdsworth, R. E., and Bailey, W.: Lateral extrusion in transpression zones; the importance of boundary conditions, J. Struct. Geol., 19, 1201–1217, 1997.
Jones, R. R., Holdsworth, R. E., Clegg, P., McCaffrey, K., and Tavarnelli, E.: Inclined transpression, J. Struct. Geol., 26, 1531–1548, 2004.
Lin, S., Jiang, D., and Williams, P. F.: Transpression (or transtension) zones of triclinic symmetry: natural example and theoretical modelling, in: Continental Transpression and Transtension Tectonics, edited by: Holdsworth, R. E., Strachan, R. A., and Dewey, J. F., Geological Society of London Special Publications, 135, 41–57, 1998.
Lin, S., Jiang, D., and Williams, P. F.: Discussion on transpression and transtension zones, J. Geol. Soc. London, 156, 1045–1048, 1999.
Linnemann, U., Gehmlich, M., Tichomirowa, M., Buschmann, B., Nasdala, L., Jonas,P., Lützner, H., and Bombach, K.: The Cadomian Orogen: Neoproterozoic to Early Cambrian crustal growth and orogenic zoning along the periphery of the West African Craton – Constraints from U-Pb zircon ages and Hf isotopes (Schwarzburg Antiform, Germany), Precambrian Res., 244, 263–278, 2014.
López Sánchez-Vizcaíno, V., Gómez Pugnaire, M. T., Azor, A., and Fernández Soler, J. M.: Phase diagram sections applied to amphibolites: a case study from the Ossa-Morena/Central Iberian Variscan suture (Southwestern Iberian Massif), Lithos, 68, 1–21, 2003.
Martínez Catalán, J. R., Arenas, R., Díaz García, F., and Abati, J.: Variscan accretionary complex of northwest Iberia: terrane correlation and succession of tectonothermal events, Geology, 25, 1103–1106, 1997.
Martínez Poyatos, D.: Estructura del borde meridional de la Zona Centroibérica y su relación con el contacto entre las Zonas Centroibérica y de Ossa-Morena, Ph. D. Thesis, Univ. de Granada, 295 pp., 1997.
Matte, P.: Accretionary history and crustal evolution of the Variscan belt in Western Europe, Tectonophysics, 196, 309–337, 1991.
Matte, P.: The Variscan collage and orogeny (480–290 Ma) and the tectonic definition of the Armorica microplate: a review, Terra Nova, 13, 122–128, 2001.
Munhá, J., Oliveira, J. T., Ribeiro, A., Oliveira, V., Quesada, C., and Kerrich, R.: Beja-Acebuches ophiolite, characterization and geodynamic significance, Boletim da sociedade Geologica de Portugal, Maleo, 2, 31, 1986.
Murphy, J. B. and Nance, R. D.: A supercontinent model for the contrasting character of Late Proterozoic orogenic belts, Geology, 9, 469–472, 1991.
Oliveira, J. T.: Part VI: South Portuguese Zone, stratigraphy and synsedimentary tectonism, in: Pre-Mesozoic Geology of Iberia, edited by: Dallmeyer, R. D. and Martínez García, E., Springer, 334–347, 1990.
Ordóñez Casado, B.: Geochronological Studies of the Pre-Mesozoic Basement of the Iberian Massif: The Ossa-Morena Zone and the Allochthonous Complexes within the Central Iberian Zone, Ph. D. Thesis, ETH, Zürich, 235 pp., 1998.
Pereira, M. F., Apraiz, A., Chichorro, M., Silva, J. B., and Armstrong, R. A.: Exhumation of high pressure rocks in northern Gondwana during the Early Carboniferous (Coimbra-Cordoba shear zone, SW Iberian Massif): tectonothermal analysis and U-Th-Pb SHRIMP in-situ zircon geochronology, Gond. Res., 17, 440–460, 2010.
Pérez-Cáceres, I., Martínez Poyatos, D., Simancas, J. F., and Azor, A.: The elusive nature of the Rheic Ocean suture in SW Iberia, Tectonics, 34, 2429–2450, 2015.
Pin, C., Liñán, E., Pascual, E., Donaire, T., and Valenzuela, A.: Late Neoproterozoic crustal growth in the European Variscides: Nd isotope and geochemical evidence from the Sierra de Córdoba Andesites (Ossa-Morena Zone, Southern Spain), Tectonophysics, 352, 133–151, 2002.
Ponce, C., Simancas, J. F., Azor, A., Martínez Poyatos, D., Booth-Rea, G., and Expósito, I.: Metamorphism and kinematics of the early deformation in the Variscan suture of SW Iberia, J. Metamor. Geol., 30, 625–638, 2012.
Quesada, C. and Dallmeyer, R. D.: Tectonothermal evolutionof the Badajoz-Córdoba shear zone (SW Iberia): characteristics and 40Ar ∕ 39Ar mineral age constraints, Tectonophysics, 231, 195–213, 1994.
Quesada, C., Fonseca, P. E., Munhá, J., Oliveira J. T., and Ribeiro, A.: The Beja-Acebuches Ophiolite (Southern Iberia Variscan fold belt): geological characterization and significance, Boletín Geológico y Minero, 105, 3–49, 1994.
Ramsay, J. G. and Huber, M. I.: The Techniques of Modern Structural Geology, vol. 2, Folds and Fractures., Springer, 393 pp., 1987.
Ribeiro, A. and Silva, J. B.: Structure of the South Portuguese Zone, in: The Carboniferous of Portugal, edited by: Sousa, M. J. L. and Oliveira, J. T., Memória dos Serviços Geológicos de Portugal, 29, 83–89, 1983.
Ribeiro, A., Pereira, E., and Severo, L.: Análise da deformaçao da zona de cisalhament Porto-Tomar na transversal de Oliveira de Azeméis, Comunicações dos Serviços Geológicos de Portugal, 66, 3–9, 1980.
Robardet, M.: Alternative approach to the Variscan Belt in southwestern Europe: pre-orogenic paleobiogeographical constraints, in: Variscan-Appalachian Dynamics: The Building of the Late Paleozoic Basement, edited by: Martínez Catalán, J. R., Hatcher, R., Arenas, R., and Díaz García, F., Geological Society of America Special Paper, 364, 1–15, 2002.
Robin, P. Y. F. and Cruden, A. R.: Strain and vorticity patterns in ideally ductile transpressional zones, J. Struct. Geol., 16, 447–466, 1994.
Rodríguez-Alonso, M. D., Peinado, M., López-Plaza, M., Franco, P., Carnicero, A., and Gonzalo, J. C.: Neoproterozoic-Cambrian synsedimentary magmatism in the Central Iberian Zone (Spain): geology, petrology and geodynamic significance, Int. J. Earth Sci., 93, 897–920, 2004.
Rubio Pascual, F. J., Matas, J., and Martín Parra, L. M.: High-pressure metamorphism in the Early Variscan subduction complex of the SW Iberian Massif, Tectonophysics, 592, 187–199, 2013.
Sánchez Carretero, R., Eguíluz, L., Pascual, E., and Carracedo, M.: Ossa-Morena Zone: Igneous rocks, in: Pre-Mesozoic Geology of Iberia, edited by: Dallmeyer, R. D. and Martínez García, E., Springer, 292–313, 1990.
Sanderson, D. J. and Marchini, W. R. D.: Transpression, J. Struct. Geol., 6, 449–458, 1984.
Shelley, D. and Bossière, G.: A new model for the Hercynian Orogen of Gondwanan France and Iberia, J. Struct. Geol., 22, 757–776, 2000.
Silva, J. B. and Pereira, M. F.: Transcurrent continental tectonics model for the Ossa-Morena Zone Neoproterozoic-Paleozoic evolution, SW Iberian Massif, Portugal, Int. J. Earth Sci., 93, 886–896, 2004.
Silva, J. B., Oliveira, J. T., and Ribeiro, A.: South Portuguese Zone, estructural outline, in: Pre-Mesozoic Geology of Iberia, edited by: Dallmeyer, R. D. and Martínez García, E., Springer, 348–362, 1990.
Simancas, J. F.: Geología de la Extremidad Oriental de la Zona Sudportuguesa, Ph. D. Thesis, Univ. de Granada, 439 pp., 1983.
Simancas, J. F.: La deformación en el sector oriental de la zona Surportuguesa, Boletín Geológico y Minero, 82, 239–268, 1986.
Simancas, J. F., Martínez Poyatos, D., Expósito, I., Azor, A., and González Lodeiro, F.: The structure of a major suture zone in the SW Iberian Massif: the Ossa-Morena/Central Iberian contact, Tectonophysics, 332, 295–308, 2001.
Simancas, J. F., Carbonell, R., González Lodeiro, F., Pérez-Estaún, A., Juhlin, C., Ayarza, P., Kashubin, A., Azor, A., Martínez Poyatos, D., Almodóvar, G. R., Pascual, E., Sáez, R., and Expósito, I.: Crustal structure of the transpressional Variscan orogen of SW Iberia: SW Iberia deep seismic reflection profile (IBERSEIS), Tectonics, 22, 1062, https://doi.org/10.1029/2002TC001479, 2003.
Simancas, J. F., Expósito, I., Azor, A., Martínez Poyatos, D., and González Lodeiro, F.: From the Cadomian orogenesis to the Early Palaeozoic Variscan rifting in Southwest Iberia, J. Iber. Geol., 30, 53–71, 2004.
Simancas, J. F., Tahiri, A., Azor, A., González Lodeiro, F., Martínez Poyatos, D., and El Hadi, H.: The tectonic frame of the Variscan-Alleghanian orogen in southern Europe and northern Africa, Tectonophysics, 398, 181–198, 2005.
Stampfli, G. M. and Borel G. D.: A plate tectonic model for the Paleozoic and Mesozoic constrained by dynamic plate boundaries and restored synthetic oceanic isochrones, Earth Planet. Sc. Lett., 196, 17–33, 2002.
Teyssier, C. and Tikoff, B.: Fabric stability in oblique convergence and divergence, J. Struct. Geol., 21, 969–974, 1999.
Teyssier, C., Tikoff, B., and Markley, M.: Oblique plate motion and continental tectonics, Geology, 23, 447–450, 1995.
Tikoff, B. and Fossen, H.: Three-dimensional deformations and strain facies, J. Struct. Geol., 21, 1497–1512, 1999.
Tikoff, B. and Teyssier, C.: Strain modeling of displacement-field partitioning in transpressional orogens, J. Struct. Geol., 16, 1575–1588, 1994.
