Research article
13 Jun 2019
Research article
| 13 Jun 2019
Fluid-mediated, brittle–ductile deformation at seismogenic depth – Part 1: Fluid record and deformation history of fault veins in a nuclear waste repository (Olkiluoto Island, Finland)
Barbara Marchesini et al.
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Francesca Prando, Luca Menegon, Mark Anderson, Barbara Marchesini, Jussi Mattila, and Giulio Viola
Solid Earth, 11, 489–511, https://doi.org/10.5194/se-11-489-2020, https://doi.org/10.5194/se-11-489-2020, 2020
Giulio Viola, Giovanni Musumeci, Francesco Mazzarini, Lorenzo Tavazzani, Espen Torgersen, Roelant van der Lelij, and Luca Aldega
EGUsphere, https://doi.org/10.5194/egusphere-2022-229, https://doi.org/10.5194/egusphere-2022-229, 2022
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A structural-geochronological approach helps to unravel the Zuccale Fault architecture. By mapping its internal structure and dating some of its fault rocks we constrained a deformation history lasting 20 Myr starting c. 22 Ma ago. Such long activity is recorded by now tightly juxtaposed Brittle Structural Facies, that is, different types of fault rocks. Our results have also implications on the regional evolution of the Northern Apennines, of which the Zuccale Fault is an important structure.
Alberto Ceccato, Giulia Tartaglia, Marco Antonellini, and Giulio Viola
EGUsphere, https://doi.org/10.5194/egusphere-2022-255, https://doi.org/10.5194/egusphere-2022-255, 2022
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The Earth's surface is commonly characterized by the occurrence of fractures, which can be mapped and their 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 scale. In doing so, we can improve our understanding of how fracture geometry and geology affect fluid flow within the fractured Earth crust.
Henning Lorenz, Jan-Erik Rosberg, Christopher Juhlin, Iwona Klonowska, Rodolphe Lescoutre, George Westmeijer, Bjarne S. G. Almqvist, Mark Anderson, Stefan Bertilsson, Mark Dopson, Jens Kallmeyer, Jochem Kück, Oliver Lehnert, Luca Menegon, Christophe Pascal, Simon Rejkjær, and Nick N. W. Roberts
Sci. Dril., 30, 43–57, https://doi.org/10.5194/sd-30-43-2022, https://doi.org/10.5194/sd-30-43-2022, 2022
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The Collisional Orogeny in the Scandinavian Caledonides project provides insights into the deep structure and bedrock of a ca. 400 Ma old major orogen to study deformation processes that are hidden at depth from direct access in modern mountain belts. This paper describes the successful operations at the second site. It provides an overview of the retrieved geological section that differs from the expected and summarises the scientific potential of the accomplished data sets and drill core.
Leonardo Del Sole, Marco Antonellini, Roger Soliva, Gregory Ballas, Fabrizio Balsamo, and Giulio Viola
Solid Earth, 11, 2169–2195, https://doi.org/10.5194/se-11-2169-2020, https://doi.org/10.5194/se-11-2169-2020, 2020
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This study focuses on the impact of deformation bands on fluid flow and diagenesis in porous sandstones in two different case studies (northern Apennines, Italy; Provence, France) by combining a variety of multiscalar mapping techniques, detailed field and microstructural observations, and stable isotope analysis. We show that deformation bands buffer and compartmentalize fluid flow and foster and localize diagenesis, recorded by carbonate cement nodules spatially associated with the bands.
Francesca Prando, Luca Menegon, Mark Anderson, Barbara Marchesini, Jussi Mattila, and Giulio Viola
Solid Earth, 11, 489–511, https://doi.org/10.5194/se-11-489-2020, https://doi.org/10.5194/se-11-489-2020, 2020
Roger Soliva, Frantz Maerten, Laurent Maerten, and Jussi Mattila
Solid Earth, 10, 1141–1154, https://doi.org/10.5194/se-10-1141-2019, https://doi.org/10.5194/se-10-1141-2019, 2019
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We propose innovative parametric modeling allowing for analysis of a very large number of fault-slip numerical simulations on 3-D discrete fault network. The approach allows for the first time producing failure envelopes of large rock volumes containing faults, using variations of geological conditions such as remote stresses, cohesion, friction, and fluid pressure. This tool helps to define the most conservative fault slip hazard case or to account for potential uncertainties in the input data.
Mirko Carlini, Giulio Viola, Jussi Mattila, and Luca Castellucci
Solid Earth, 10, 343–356, https://doi.org/10.5194/se-10-343-2019, https://doi.org/10.5194/se-10-343-2019, 2019
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Physical properties of layered sedimentary rocks affect nucleation and propagation of discontinuities therein. Fractures developing through sedimentary sequences characterized by the alternation of strong and weak layers are strongly deviated along their track at layers’ boundaries, and depending on the layer they cross-cut, they show very thick (strong layers) or very thin (weak layers) infills of precipitated minerals, potentially representing pathways for ore deposits and oil/water resources.
Alberto Ceccato, Luca Menegon, Giorgio Pennacchioni, and Luiz Fernando Grafulha Morales
Solid Earth, 9, 1399–1419, https://doi.org/10.5194/se-9-1399-2018, https://doi.org/10.5194/se-9-1399-2018, 2018
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Metamorphic fine-grained reaction products make continental crust rocks weaker. Microstructural processes related to the transformation of strong K-feldspar into weak aggregates of plagioclase and quartz during crustal deformation have been investigated through electron microscopy. Rheological calculations show that the occurrence of even small amounts of weak aggregates, whose deformation is mainly diffusion-assisted, would lead to a decrease in rock viscosity of several orders of magnitude.
James Gilgannon, Florian Fusseis, Luca Menegon, Klaus Regenauer-Lieb, and Jim Buckman
Solid Earth, 8, 1193–1209, https://doi.org/10.5194/se-8-1193-2017, https://doi.org/10.5194/se-8-1193-2017, 2017
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We examine rocks from the middle crust to explore how fluids circulate and influence a rock’s response to larger-scale tectonic movements. A model is developed in which fluids deep in the Earth migrate to clusters of pores generated during those movements. We document how distinct pores form in a specific order in association with local changes in how quartz deforms. The porosity evolves out of the deformation, changing the rate the rock moved under tectonic forces.
Giancarlo Molli, Luca Menegon, and Alessandro Malasoma
Solid Earth, 8, 767–788, https://doi.org/10.5194/se-8-767-2017, https://doi.org/10.5194/se-8-767-2017, 2017
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We present a new case study on the role of brittle precursors in nucleating shear zone. Our studied sample shows a high-pressure, low-temperature (HP/LT) microscale ultramylonite developed by brittle precursors induced during deformation within a host HP/LT granitic mylonite. We infer that the studied structures may be considered as a small-scale example of fault structures related to stick-slip strain accommodation during subduction of continental crust.
Gustavo Viegas, Luca Menegon, and Carlos Archanjo
Solid Earth, 7, 375–396, https://doi.org/10.5194/se-7-375-2016, https://doi.org/10.5194/se-7-375-2016, 2016
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This paper presents microstructural and chemical data of mylonitic granitoids deformed at the brittle-ductile transition in the continental crust. Through a combination of microstructures, chemical analyses and modelling of the strength of constituent phases, we were able to show that strain localisation in shear zones may be triggered primarily by brittle failure, without the need for reaction-softening mechanisms promoted by metamorphic fluids.
H. J. Kjøll, G. Viola, L. Menegon, and B. E. Sørensen
Solid Earth, 6, 681–699, https://doi.org/10.5194/se-6-681-2015, https://doi.org/10.5194/se-6-681-2015, 2015
Related subject area
Subject area: Tectonic plate interactions, magma genesis, and lithosphere deformation at all scales | Editorial team: Structural geology and tectonics, rock physics, experimental deformation | Discipline: Structural geology
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Chao Deng, Rixiang Zhu, Jianhui Han, Yu Shu, Yuxiang Wu, Kefeng Hou, and Wei Long
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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.
Jin Lai, Dong Li, Yong Ai, Hongkun Liu, Deyang Cai, Kangjun Chen, Yuqiang Xie, and Guiwen Wang
Solid Earth Discuss., https://doi.org/10.5194/se-2021-85, https://doi.org/10.5194/se-2021-85, 2021
Revised manuscript accepted for SE
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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 presences of fracture.
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.
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.
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.
Jef Deckers, Bernd Rombaut, Koen Van Noten, and Kris Vanneste
Solid Earth, 12, 345–361, https://doi.org/10.5194/se-12-345-2021, https://doi.org/10.5194/se-12-345-2021, 2021
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This study shows the presence of two structural domains in the western border fault system of the Roer Valley graben. These domains, dominated by NW–SE-striking faults, displayed distinctly different strain distributions during both Late Cretaceous compression and Cenozoic extension. The southern domain is characterized by narrow, localized faulting, while the northern domain is characterized by wide, distributed faulting. The non-colinear WNW–ESE Grote Brogel fault links both domains.
José Piquer, Orlando Rivera, Gonzalo Yáñez, and Nicolás Oyarzún
Solid Earth, 12, 253–273, https://doi.org/10.5194/se-12-253-2021, https://doi.org/10.5194/se-12-253-2021, 2021
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A proper recognition of deep, long-lived fault systems is very important for society. They can produce potentially dangerous earthquakes. They can also act as pathways for magmas and hydrothermal fluids, leading to the formation of volcanoes, geothermal systems and mineral deposits. However, the manifestations of these very old faults in the present-day surface can be very subtle. Here, we present a detailed, multi-disciplinary study of a fault system of this type in the Andes of central Chile.
Antonin Bilau, Yann Rolland, Stéphane Schwartz, Nicolas Godeau, Abel Guihou, Pierre Deschamps, Benjamin Brigaud, Aurélie Noret, Thierry Dumont, and Cécile Gautheron
Solid Earth, 12, 237–251, https://doi.org/10.5194/se-12-237-2021, https://doi.org/10.5194/se-12-237-2021, 2021
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As a result of the collision between the European and Apulian plates, the Alps have experienced several evolutionary stages. The Penninic frontal thrust (PFT) (major thrust) was associated with compression, and now seismic studies show ongoing extensional activity. Calcite mineralization associated with shortening and extensional structures was sampled. The last deformation stages are dated by U–Pb on calcite at ~ 3.5 and ~ 2.5 Ma. Isotope analysis evidences deep crustal fluid mobilization.
Kathryn E. Elphick, Craig R. Sloss, Klaus Regenauer-Lieb, and Christoph E. Schrank
Solid Earth, 12, 141–170, https://doi.org/10.5194/se-12-141-2021, https://doi.org/10.5194/se-12-141-2021, 2021
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We analysed a sedimentary rock package located in Castlepoint, New Zealand, to test the control of the tectonic setting on the observed deformation structures. In extension and contraction, we observed faults and small fault-like structures characterised by complex spatial patterns and a reduction in porosity and grain size compared with the host rock. With these properties, the structures are likely to act as barriers to fluid flow and cause compartmentalisation of the sedimentary sequence.
Penelope I. R. Wilson, Robert W. Wilson, David J. Sanderson, Ian Jarvis, and Kenneth J. W. McCaffrey
Solid Earth, 12, 95–117, https://doi.org/10.5194/se-12-95-2021, https://doi.org/10.5194/se-12-95-2021, 2021
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Magma accommodation in the shallow crust leads to deformation of the surrounding host rock through the creation of faults, fractures and folds. This deformation will impact fluid flow around intrusive magma bodies (including sills and laccoliths) by changing the porosity and permeability network of the host rock. The results may have important implications for industries where fluid flow within the subsurface adds value (e.g. oil and gas, hydrology, geothermal and carbon sequestration).
Martin Balcewicz, Benedikt Ahrens, Kevin Lippert, and Erik H. Saenger
Solid Earth, 12, 35–58, https://doi.org/10.5194/se-12-35-2021, https://doi.org/10.5194/se-12-35-2021, 2021
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The geothermal potential of a carbonate reservoir in the Rhine-Ruhr area, Germany, was investigated by field and laboratory investigations. The carbonate layer of interest is approx. 150 m thick; located at 4 to 6 km depth; and might extend below Essen, Bochum, and Dortmund. We proposed focusing on discontinuities striking NNW–SSE for geothermal applications, as these are the most common, strike in the direction of the main horizontal stress, and dominate reservoir fluid flow.
Andrea Bistacchi, Silvia Mittempergher, Mattia Martinelli, and Fabrizio Storti
Solid Earth, 11, 2535–2547, https://doi.org/10.5194/se-11-2535-2020, https://doi.org/10.5194/se-11-2535-2020, 2020
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We present an innovative workflow for the statistical analysis of fracture data collected along scanlines. Our methodology is based on performing non-parametric statistical tests, which allow detection of important features of the spatial distribution of fractures, and on the analysis of the cumulative spacing function (CSF) and cumulative spacing derivative (CSD), which allows the boundaries of stationary domains to be defined in an objective way.
Martina Kirilova, Virginia Toy, Katrina Sauer, François Renard, Klaus Gessner, Richard Wirth, Xianghui Xiao, and Risa Matsumura
Solid Earth, 11, 2425–2438, https://doi.org/10.5194/se-11-2425-2020, https://doi.org/10.5194/se-11-2425-2020, 2020
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Processes associated with open pores can change the physical properties of rocks and cause earthquakes. In borehole samples from the Alpine Fault zone, we show that many pores in these rocks were filled by weak materials that can slide easily. The amount of open spaces was thus reduced, and fluids circulating within them built up high pressures. Both weak materials and high pressures within pores reduce the rock strength; thus the state of pores here can trigger the next Alpine Fault earthquake.
José Manuel Benítez-Pérez, Pedro Castiñeiras, Juan Gómez-Barreiro, José R. Martínez Catalán, Andrew Kylander-Clark, and Robert Holdsworth
Solid Earth, 11, 2303–2325, https://doi.org/10.5194/se-11-2303-2020, https://doi.org/10.5194/se-11-2303-2020, 2020
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The Sobrado unit represents an allochthonous tectonic slice of exhumed high-grade metamorphic rocks formed during a complex sequence of orogenic processes in the middle to lower crust. We have combined U–Pb geochronology and REE analyses (LASS-ICP-MS) of accessory minerals in migmatitic paragneiss (monazite, zircon) and mylonitic amphibolites (titanite) to constrain the evolution. A Middle Devonian minimum age for HP metamorphism has been obtained.
Anna M. Dichiarante, Ken J. W. McCaffrey, Robert E. Holdsworth, Tore I. Bjørnarå, and Edward D. Dempsey
Solid Earth, 11, 2221–2244, https://doi.org/10.5194/se-11-2221-2020, https://doi.org/10.5194/se-11-2221-2020, 2020
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We studied the characteristics of fracture systems in the Devonian rocks of the Orcadian Basin in Caithness. These mineral-filled fractures have properties that may be used to predict the size and spatial arrangement of similar structures in offshore basins. This includes the Clair field in the Faroe–Shetland Basin.
Leonardo Del Sole, Marco Antonellini, Roger Soliva, Gregory Ballas, Fabrizio Balsamo, and Giulio Viola
Solid Earth, 11, 2169–2195, https://doi.org/10.5194/se-11-2169-2020, https://doi.org/10.5194/se-11-2169-2020, 2020
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This study focuses on the impact of deformation bands on fluid flow and diagenesis in porous sandstones in two different case studies (northern Apennines, Italy; Provence, France) by combining a variety of multiscalar mapping techniques, detailed field and microstructural observations, and stable isotope analysis. We show that deformation bands buffer and compartmentalize fluid flow and foster and localize diagenesis, recorded by carbonate cement nodules spatially associated with the bands.
Billy James Andrews, Zoe Kai Shipton, Richard Lord, and Lucy McKay
Solid Earth, 11, 2119–2140, https://doi.org/10.5194/se-11-2119-2020, https://doi.org/10.5194/se-11-2119-2020, 2020
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Through geological mapping we find that fault zone internal structure depends on whether or not the fault cuts multiple lithologies, the presence of shale layers, and the orientation of joints and coal cleats at the time of faulting. During faulting, cementation of fractures (i.e. vein formation) is highest where the fractures are most connected. This leads to the counter-intuitive result that the highest-fracture-density part of the network often has the lowest open-fracture connectivity.
Nicolas Mansard, Holger Stünitz, Hugues Raimbourg, Jacques Précigout, Alexis Plunder, and Lucille Nègre
Solid Earth, 11, 2141–2167, https://doi.org/10.5194/se-11-2141-2020, https://doi.org/10.5194/se-11-2141-2020, 2020
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Our rock deformation experiments (solid-medium Griggs-type apparatus) on wet assemblages of mafic compositions show that the ability of minerals to react controls the portions of rocks that deform and that minor chemical and mineralogical variations can considerably modify the strength of deformed assemblages. Our study suggests that the rheology of mafic rocks, which constitute a large part of the oceanic crust, cannot be summarized as being rheologically controlled by monophase materials.
Vladimir Shipilin, David C. Tanner, Hartwig von Hartmann, and Inga Moeck
Solid Earth, 11, 2097–2117, https://doi.org/10.5194/se-11-2097-2020, https://doi.org/10.5194/se-11-2097-2020, 2020
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In our work, we carry out an in-depth structural analysis of a geometrically decoupled fault system in the southern German Molasse Basin using a high-resolution 3-D seismic dataset. Based on this analysis, we reconstruct the tectonic history and changes in the stress regimes to explain the structure and evolution of faults. The results contribute in understanding the driving mechanisms behind formation, propagation, and reactivation of faults during foreland basin formation.
Nick M. W. Roberts, Jack K. Lee, Robert E. Holdsworth, Christopher Jeans, Andrew R. Farrant, and Richard Haslam
Solid Earth, 11, 1931–1945, https://doi.org/10.5194/se-11-1931-2020, https://doi.org/10.5194/se-11-1931-2020, 2020
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We characterise a well-known fractured and faulted exposure of Cretaceous chalk in NE England, combining field observations with novel U–Pb calcite dating. We show that the faulting and associated fluid flow occurred during the interval of ca. 64–56 Ma, predating earlier estimates of Alpine-related tectonic inversion. We demonstrate that the main extensional fault zone acted as a conduit linking voluminous fluid flow and linking deeper sedimentary layers with the shallow subsurface.
Elizabeth S. Petrie, Kelly K. Bradbury, Laura Cuccio, Kayla Smith, James P. Evans, John P. Ortiz, Kellie Kerner, Mark Person, and Peter Mozley
Solid Earth, 11, 1803–1821, https://doi.org/10.5194/se-11-1803-2020, https://doi.org/10.5194/se-11-1803-2020, 2020
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A summary of observed rock properties across the contact between crystalline basement rock and the overlying younger sedimentary rocks from outcrop and core samples is presented. The data span a range of tectonic settings and describe the rock types immediately adjacent to the contact. The range of features observed at these contacts can influence the migration of fluids. The observations presented here are critical for the safe implementation of fluid injection and geothermal production.
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.
I. Tonguç Uysal, Claudio Delle Piane, Andrew James Todd, and Horst Zwingmann
Solid Earth, 11, 1653–1679, https://doi.org/10.5194/se-11-1653-2020, https://doi.org/10.5194/se-11-1653-2020, 2020
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This study represents an integrated approach to radiometric age dating using potassium-bearing clay minerals formed during faulting and provides insights into the enigmatic time–space distribution of Precambrian tectonic zones in north-central Australia. Specifically, our work firmly indicates a late Mesoproterzoic minimum age for the Millungera Basin in north Australia and a previously unrecorded concealed late Mesoproterozoic–early Neoproterozoic tectonic event in north-central Australia.
Stefano Tavani, Pablo Granado, Amerigo Corradetti, Thomas Seers, Josep Maria Casas, and Josep Anton Muñoz
Solid Earth, 11, 1643–1651, https://doi.org/10.5194/se-11-1643-2020, https://doi.org/10.5194/se-11-1643-2020, 2020
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Using orthophotos, we manually digitized 30 000 joints in the eastern Ebro Basin of the Pyrenees. Joints are perpendicular to the belt in the frontal portion of the belt and in the inner and central portion of the foredeep basin. Joint orientations in the external portion of the foredeep become less clustered. Joints in the studied area formed in the foredeep in response to foredeep-parallel stretching, which becomes progressively less intense within the external portion of the foredeep basin.
Thomas B. Phillips, Christopher A.-L. Jackson, and James R. Norcliffe
Solid Earth, 11, 1489–1510, https://doi.org/10.5194/se-11-1489-2020, https://doi.org/10.5194/se-11-1489-2020, 2020
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Normal faults often reactivate under compression, in a process called inversion. The 3D geometry of these structures (and the effect on resultant inversion structural style) is often not considered. Using seismic reflection data, we examine how stresses form different inversion styles that are controlled by the geometry of the pre-existing structure. Geometrically simple faults are preferentially reactivated; more complex areas are typically not reactivated and instead experience bulk uplift.
Ashton Krajnovich, Wendy Zhou, and Marte Gutierrez
Solid Earth, 11, 1457–1474, https://doi.org/10.5194/se-11-1457-2020, https://doi.org/10.5194/se-11-1457-2020, 2020
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In this paper, a novel methodology of 3D geologic model uncertainty assessment that considers both input data and prior knowledge is developed and applied to characterize fault zones – areas of damaged rock surrounding a fault surface that are important to subsurface engineering projects. The results of the study demonstrate how existing frameworks can be expanded to incorporate new types of information to arrive at a realistic and straightforward model of fault zone geometry in the subsurface.
Sreyashi Bhowmick and Tridib Kumar Mondal
Solid Earth, 11, 1227–1246, https://doi.org/10.5194/se-11-1227-2020, https://doi.org/10.5194/se-11-1227-2020, 2020
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We explore pre-existing fabric in metabasalts replete with a wide range of crisscross fractures/faults, hosting quartz veins of variable orientations and thicknesses in the Chitradurga region, India. The fractures are identified as components of a riedel shear system. We evaluate reactivation potential of fractures and conclude that episodic changes in fluid pressure conditions triggered fault-valve action, thereby reactivating fabric and fractures, leading to vein emplacement in the region.
Tim P. Dooley and Michael R. Hudec
Solid Earth, 11, 1187–1204, https://doi.org/10.5194/se-11-1187-2020, https://doi.org/10.5194/se-11-1187-2020, 2020
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Sandbox models investigated extension and inversion of salt-bearing rifts such as those found in the Moroccan High Atlas, North Africa. Sand packs were stretched and the structural lows were filled with a salt analog. Models were then subjected to additional extension and loading that remobilized the salt into diapirs. During shortening the distribution of the salt in the overburden governed the structural styles and trends in the supra-salt strata, strongly decoupled from subsalt deformation.
Christopher A.-L. Jackson, Paul S. Whipp, Robert L. Gawthorpe, and Matthew M. Lewis
Solid Earth, 11, 1027–1051, https://doi.org/10.5194/se-11-1027-2020, https://doi.org/10.5194/se-11-1027-2020, 2020
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Plate tectonics describes the creation, motion, and ultimate destruction of the Earth's continents and oceans. A key plate tectonic process is continental extension; this occurs when the Earth's plates are pulled apart to ultimately form a new ocean. Giant fractures (faults) accommodate plate stretching, although buckling (folding) is thought to be locally important. We use field data to understand how fracturing and buckling relate to each other, demonstrating they are spatially complex.
Efstratios Delogkos, Muhammad Mudasar Saqab, John J. Walsh, Vincent Roche, and Conrad Childs
Solid Earth, 11, 935–945, https://doi.org/10.5194/se-11-935-2020, https://doi.org/10.5194/se-11-935-2020, 2020
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Normal faults have irregular geometries on a range of scales. A quantitative model has been presented which illustrates the range of deformation arising from movement on fault surface irregularities, with fault-bend folding generating geometries reminiscent of normal drag and reverse drag. We show that fault throw can be subject to errors of up to ca. 50 % for realistic fault bend geometries (up to ca. 40°), even on otherwise sub-planar faults with constant displacement.
David A. Ferrill, Kevin J. Smart, and Alan P. Morris
Solid Earth, 11, 899–908, https://doi.org/10.5194/se-11-899-2020, https://doi.org/10.5194/se-11-899-2020, 2020
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This paper explores failure modes and deformation behavior of faults in the mechanically layered Eagle Ford Formation, an ultra-low permeability self-sourced oil and gas reservoir and aquitard in southwest Texas, USA. The role of dilation versus slip relates in predictable ways to mechanical stratigraphy, stress field, and dilation and slip tendency. We conclude that dilation tendency vs. slip tendency can be used to infer fault and fracture deformation modes and conduit versus seal behaviour.
Raúl Pérez-López, José F. Mediato, Miguel A. Rodríguez-Pascua, Jorge L. Giner-Robles, Adrià Ramos, Silvia Martín-Velázquez, Roberto Martínez-Orío, and Paula Fernández-Canteli
Solid Earth, 11, 719–739, https://doi.org/10.5194/se-11-719-2020, https://doi.org/10.5194/se-11-719-2020, 2020
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Long-term monitoring of CO2 of onshore storage has to consider thousands of years as a medium lifetime of the storage. In this wide time interval, the stress and strain properties of the reservoir change and earthquakes could occur. Therefore, we have to identify those fault sets which can be reactivated by changing the stress conditions. We need to know the role of active fault sets and model the changing conditions to prevent induced seismicity.
Joel B. H. Andersson, Tobias E. Bauer, and Edward P. Lynch
Solid Earth, 11, 547–578, https://doi.org/10.5194/se-11-547-2020, https://doi.org/10.5194/se-11-547-2020, 2020
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In this field-based study, geological structures and hydrothermal alterations in one of the least known geological terrains in Sweden are investigated. The area is located above the polar circle in northwestern Sweden that produces a significant portion of the iron and copper in the EU. A new tectonic model based on field evidence and microstructures is presented and it is shown that minerals typical for iron and copper–gold deposits can be linked to different phases of the structural evolution.
Cited articles
Aaltonen, I., Lahti, M., Engström, J., Mattila, J., Paananen, M.,
Paulamäki, S., Gehör, S., Kärki, A., Ahokas, T., Torvela, T., and
Front, K.: Geological model of the Olkiluoto site, Version 2.0, Posiva
Working Report 2010-70, Posiva Oy, Eurajoki, 2010.
Aaltonen, I., Engström, J., Front, K., Gehör, S., Kosunen, P., and
Kärki, A.: Geology of Olkiluoto, Posiva Working Report 2016-16, Posiva
Oy, Eurajoki, 2016.
Andersen, T., Austrheim, H., and Burke, E. A. J.: Fluid inclusions in
granulites and eclogites from the Bergen Arcs, Caledonides of W. Norway,
Mineral. Mag., 54, 145–158, 1990.
Ault, A. K. and Selverstone, J.: Microtextural constraints on the interplay
between fluid-rock reactions and deformation, Contrib. Mineral. Petr.,
156, 501–515, https://doi.org/10.1007/s00410-008-0298-9, 2008.
Bakker, R.: Re-Equilibration Processes in Fluid Inclusion Assemblages,
Minerals, 7, 1–19, https://doi.org/10.3390/min7070117, 2017.
Bakker, R. J. and Jansen, J. B. H.: Preferential water leakage from fluid
inclusions by means of mobile dislocations, Nature, 345, 58–60,
https://doi.org/10.1038/345058a0, 1990.
Bakker, R. J. and Jansen, J. B. H.: Experimental post-entrapment water loss
from synthetic CO2-H2O inclusions in natural quartz, Geochim. Cosmochim.
Ac., 55, 2215–2230, https://doi.org/10.1016/0016-7037(91)90098-P, 1991.
Bakker, R. J. and Jansen, J. B. H.: A mechanism for preferential H2O leakage
from fluid inclusions in quartz, based on TEM observations, Contrib. Mineral. Petr., 116, 7–20, https://doi.org/10.1007/BF00310686, 1994.
Basson, I. J. and Viola, G.: Passive kimberlite intrusion into actively
dilating dyke-fracture arrays: Evidence from fibrous calcite veins and
extensional fracture cleavage, Lithos, 76, 283–297,
https://doi.org/10.1016/j.lithos.2004.03.041, 2004.
Bestmann, M., Pennacchioni, G., Nielsen, S., Göken, M., and de Wall, H.:
Deformation and ultrafine dynamic recrystallization of quartz in
pseudotachylyte-bearing brittle faults: A matter of a few seconds, J. Struct.
Geol., 38, 21–38, https://doi.org/10.1016/j.jsg.2011.10.001, 2012.
Bodnar, R. J.: The origin of fluid inclusions, in: Fluid inclusions: Analysis and
Interpretation, edited by: Samson, I., Anderson, A.,
and Marshall, D.,
Vancouver, Canada: Mineralogical Association of Canada, 11–18, 2003a.
Bodnar, R. J.: Re-equilibration of fluid inclusions, in: Fluid inclusions: Analysis and
Interpretation, edited by: Samson, I.,
Anderson, A., and Marshall, D., Vancouver, Canada: Mineralogical Association of Canada,
213–230, 2003b.
Boiron, M., Cathelineau, M., Banks, D. A., Fourcade, S., and Vallance, J.:
Mixing of metamorphic and surficial fluids during the uplift of the Hercynian
upper crust: consequences for gold deposition, Chem. Geol., 194, 119–141,
2003.
Bons, P. D.: The formation of large quartz veins by rapid ascent of fluids in
mobile hydrofractures, Tectonophysics, 336, 1–17,
https://doi.org/10.1016/S0040-1951(01)00090-7, 2001.
Bons, P. D., Elburg, M. A., and Gomez-Rivas, E.: A review of the formation of
tectonic veins and their microstructures, J. Struct. Geol., 43, 33–62,
https://doi.org/10.1016/j.jsg.2012.07.005, 2012.
Bourdelle, F. and Cathelineau, M.: Low-temperature chlorite geothermometry: a
graphical representation based on a a T–R2+–Si diagram, Eur. J. Mineral.,
27, 617–626, https://doi.org/10.1127/ejm/2015/0027-2467, 2015.
Caine, J. S., Evans, J. P., and Forster, C. B.: Fault zone architechture and
permeability structure, Geology, 24, 1025–1028,
https://doi.org/10.1130/0091-7613(1996)024<1025, 1996.
Compton, K. E., Kirkpatrick, J. D., and Holk, G. J.: Cyclical shear fracture
and viscous flow during transitional ductile-brittle deformation in the
Saddlebag Lake Shear Zone, California, Tectonophysics, 708, 1–14,
https://doi.org/10.1016/j.tecto.2017.04.006, 2017.
Cox, S., Knackstedt, M., and Braun, J.: Principles of structural control on
permeability and fluid flow in hydrothermal systems, Rev. Econ. Geol.,
14, 1–24, 2001.
Cox, S. F.: Faulting processes at high fluid pressures: An example of fault
valve behavior from the Wattle Gully Fault, Victoria, Australia, J. Geophys.
Res., 100, 841–859, 1995.
Cox, S. F.: Coupling between deformation, fluid pressures and fluid flow in
ore-producing hydrothermal environments, Econ. Geol., 100th Anniversary
Volume, 39–75, 2005.
Cox, S. F.: Injection-driven swarm seismicity and permeability enhancement:
Implications for the dynamics of hydrothermal ore systems in high fluid-flux,
overpressured faulting regimes – An invited paper, Econ. Geol., 111,
559–587, https://doi.org/10.2113/econgeo.111.3.559, 2016.
Crider, J. G. and Peacock, D. C. P.: Initiation of brittle faults in the
upper crust: A review of field observations, J. Struct. Geol., 26,
691–707, https://doi.org/10.1016/j.jsg.2003.07.007, 2004.
De Paola, N., Collettini, C., Trippetta, F., Barchi, M. R., and Minelli, G.: A
mechanical model for complex fault patterns induced by evaporite dehydration
and cyclic changes in fluid pressure, J. Struct. Geol., 29, 1573–1584,
https://doi.org/10.1016/j.jsg.2007.07.015, 2007.
Derez, T., Pennock, G., Drury, M., and Sintubin, M.: Low-temperature
intracrystalline deformation microstructures in quartz, J. Struct. Geol., 71,
3–23, https://doi.org/10.1016/j.jsg.2014.07.015, 2015.
Diamond, L. W.: Introduction to gas-bearing, aqueous fluid inclusions, in:
Fluid Inclusions: Analysis and Interpretation, edited by: Samson, I.,
Anderson, A., and Marshall, D., 363–372, 2003.
Diamond, L. W., Tarantola, A., and Stünitz, H.: Modification of fluid
inclusions in quartz by deviatoric stress. II: Experimentally induced changes
in inclusion volume and composition, Contrib. Mineral. Petr., 160,
845–864, https://doi.org/10.1007/s00410-010-0510-6, 2010.
Dubessy, J., Buschaert, S., Lamb, W., Pironon, J., and Thiéry, R.:
Methane-bearing aqueous fluid inclusions: Raman analysis, thermodynamic
modelling and application to petroleum basins, Chem. Geol., 173,
193–205, https://doi.org/10.1016/S0009-2541(00)00275-8, 2001.
Ehlers, C., Lindroos, A., and Selonen, O.: The late Svecofennian
granite-migmatite zone of southern Finland-a belt of transpressive
deformation and granite emplacement, Precambrian Res., 64, 295–309,
1993.
Fall, A., Donald, R., and Bodnar, R. J.: The effect of fluid inclusion size on
determination of homogenization temperature and density of liquid-rich
aqueous inclusions, Am. Mineral., 94, 1569–1579,
https://doi.org/10.2138/am.2009.3186, 2009.
Famin, V., Hébert, R., Philippot, P., and Jolivet, L.: Evolution of
hydrothermal regime along a crustal shear zone, Tinos Island, Greece,
Tectonics, 23, TC5004, https://doi.org/10.1029/2003TC001509, 2004.
Famin, V., Hébert, R., Phillippot, P., and Jolivet, L.: Ion probe and
fluid inclusion evidence for co-seismic fluid infiltration in a crustal
detachment, Contrib. Mineral Petrol., 150, 354–367,
https://doi.org/10.1007/s00410-005-0031-x, 2005.
Garofalo, P. S.: Mass transfer during gold precipitation within a vertically
extensive vein network (Sigma deposit – Abitibi greenstone belt – Canada).
Part II. Mass transfer calculations, Eur. J. Mineral., 16, 761–776,
https://doi.org/10.1127/0935-1221/2004/0016-0761, 2004.
Garofalo, P. S., Matthäi, S. K., and Heinrich, C. A.: Three-dimensional
geometry, ore distribution, and time-integrated mass transfer through the
quartz-tourmaline-gold vein network of the Sigma deposit (Abitibi belt –
Canada), Geofluids, 2, 217–232, 2002.
Garofalo, P. S., Fricker, M. B., Günther, D., Bersani, D., and Lottici,
P.: Physical-chemical properties and metal budget of Au-transporting
hydrothermal fluids in orogenic deposits, Geol. Soc. London, Spec. Publ.,
402, 71–102, https://doi.org/10.1144/SP402.8, 2014.
Goddard, J. V. and Evans, J. P.: Chemical changes and fluid-rock interaction
in faults of crystalline thrust sheets, northwestern Wyoming, USA, J.
Struct. Geol., 17, 533–547, https://doi.org/10.1016/0191-8141(94)00068-B, 1995.
Goldstein, R. H.: Petrographic analysis of fluid inclusions, in: Fluid inclusions: Analysis and Interpretation: Mineralogical Association of Canada, edited by: Samson, I., Anderson, A., and Marshall, D., 1–45, 2003.
Goldstein, R. H. and Reynolds, T. J.: Fluid inclusion microthermometry, in: Systematics of fluid inclusions in diagenetic minerals – SEPM Short Course 31. SEPM (Society for Sedimentary Geology), edited by: Goldstein, R. H., Tulsa, Oklahoma, 87–121,
1994.
Gorbatschev, R. and Bogdanova, S.: Frontiers in the Baltic Shield,
Precambrian Res., 64, 3–21, https://doi.org/10.1016/0301-9268(93)90066-B, 1993.
Griffith, A. A.: The Phenomena of Rupture and Flow in Solids, Philos. T.
Roy. Soc. Lond., 221, 163–198, 1920.
Guermani, A. and Pennacchioni, G.: Brittle precursors of plastic deformation
in a granite: An example from the Mont Blanc massif (Helvetic, western Alps),
J. Struct. Geol., 20, 135–148, https://doi.org/10.1016/S0191-8141(97)00080-1,
1998.
Healy, J. H., Rubey, W. W., Griggs, D. T., and Raleigh, C. B.: The Denver
Earthquakes. Disposal of waste fluids by injection into a deep well has
riggered earthquakes near Denver, Colorado, Science, 161, 1301–1310,
1968.
Heinrich, C. A., Andrew, A. S., and Knill, M. D.: Regional metamorphism and
ore formation: Evidence from stable isotopes and other fluid tracers, Rev. Econ. Geol., 11, 97–117, 2000.
Hey, M. H.: A new review of the chlorites, Mineral. Mag. J. M. Soc.,
224, 277–292, https://doi.org/10.1180/minmag.1954.030.224.01, 1954.
Hudson, J. A. and Cosgrove, J.: Geological History and Its Impact on the Rock
Mechanics Properties of the Olkiluoto Site, Posiva Working Report 2006,
Posiva Oy, Eurajoki, 2006.
Invernizzi, C., Vityk, M., Cello, G., and Bodnar, R.: Fluid inclusions in high
pressure/low temperature rocks from the Calabrian Arc (Southern Italy): the
burial and exhumation history of the subduction-related Diamante-Terranova
unit, J. Metamorph. Geol., 16, 2, 247–258, 1998.
Jaques, L. and Pascal, C.: Full paleostress tensor reconstruction using
quartz veins of Panasqueira Mine, central Portugal; part I: Paleopressure
determination, J. Struct. Geol., 102, 58–74, https://doi.org/10.1016/j.jsg.2017.07.006,
2017.
Kaduri, M., Gratier, J. P., Renard, F., Çakir, Z., and Lasserre, C.: The
implications of fault zone transformation on aseismic creep: Example of the
North Anatolian Fault, Turkey, J. Geophys. Res.-Sol. Ea., 122,
4208–4236, https://doi.org/10.1002/2016JB013803, 2017.
Kärki, A. and Paulamäki, S.: Petrology of Olkiluoto, Posiva Report
2006-02, Posiva Oy, Eurajoki, 2006.
Kerrich, R.: Some effects of tectonic recrystallisation on fluid inclusions
in vein quartz, Contrib. Mineral. Petr., 59, 195–202,
https://doi.org/10.1007/BF00371308, 1976.
Kjøll, H. J., Viola, G., Menegon, L., and Sørensen, B. E.: Brittle-viscous deformation of vein quartz under fluid-rich lower greenschist
facies conditions, Solid Earth, 6, 681–699, https://doi.org/10.5194/se-6-681-2015, 2015.
Kohlstedt, D. L., Evans, B., and Mackwell, S. J.: Strength of the lithosphere:
Constraints imposed by laboratory experiments, J. Geophys. Res., 100,
587–602, 1995.
Korja, A., Heikkinen, P., and Aaro, S.: Crustal structure of the northern
Baltic Sea palaeorift, Tectonophysics, 331, 341–358,
https://doi.org/10.1016/S0040-1951(00)00290-0, 2001.
Kukkonen, I. T. and Lauri, L. S.: Modelling the thermal evolution of a
collisional Precambrian orogen: High heat production migmatitic granites of
southern Finland, Precambrian Res., 168, 233–246,
https://doi.org/10.1016/j.precamres.2008.10.004, 2009.
Lahtinen, R., Korja, A., and Nironen, M: Palaeoproterozoic tectonic evolution, in: Precambrian Geology of Finland: Key to the Evolution of the Fennoscandian Shield, edited by: Lehtinen, M., Nurmi, P. A., and Rämö, O. T., Developments in Precambrian Geology, 2005.
Mancktelow, N. S. and Pennacchioni, G.: The influence of grain boundary
fluids on the microstructure of quartz-feldspar mylonites, J. Struct. Geol.,
26, 47–69, https://doi.org/10.1016/S0191-8141(03)00081-6, 2004.
Mancktelow, N. S. and Pennacchioni, G.: The control of precursor brittle
fracture and fluid-rock interaction on the development of single and paired
ductile shear zones, J. Struct. Geol., 27, 645–661,
https://doi.org/10.1016/j.jsg.2004.12.001, 2005.
Mattila, J. and Viola, G.: New constraints on 1.7Gyr of brittle tectonic
evolution in southwestern Finland derived from a structural study at the site
of a potential nuclear waste repository (Olkiluoto Island), J. Struct. Geol.,
67, 50–74, https://doi.org/10.1016/j.jsg.2014.07.003, 2014.
Menegon, L., Marchesini, B., Prando, F., Garofalo, P. S., Viola, G.,
Anderson, M., and Mattila, J.: Brittle-viscous oscillations and different slip
behaviours in a conjugate set of strike-slip faults, Geophys. Res.,
Abstracts Vol. 20, EGU2018-14799, 2018.
Miller, S. A.: The Role of Fluids in Tectonic and Earthquake Processes,
edited by: Dmowska, R., Elsevier, 2013.
Mittempergher, S., Dallai, L., Pennacchioni, G., Renard, F., and Di Toro, G.:
Origin of hydrous fluids at seismogenic depth: Constraints from natural and
experimental fault rocks, Earth Planet. Sc. Lett., 385, 97–109,
https://doi.org/10.1016/j.epsl.2013.10.027, 2014.
Moritz, R., Ghazban, F., and Singer, B. S.: Eocene Gold Ore Formation at
Muteh, Sanandaj-Sirjan Tectonic Zone, Western Iran: A Result of Late-Stage
Extension and Exhumation of Metamorphic Basement Rocks within the Zagros
Orogen, Econ. Geol., 101, 1–28, 2006.
Morrison, J.: Meteoric water-rock interaction in the lower plate of the
Whipple Mountain metamorphic core complex, California, J. Metamorph.
Geol., 12, 827–840, 1994.
Morrison, J. and Anderson, J. L.: Footwall Refrigeration Along a Detachment
Fault: Implications for the Thermal Evolution of Core Complexes, Science,
279, 63–67, 1998.
Mulch, A.,
Teyssier, C.,
Cosca, M. A.,
Vanderhaeghe, O., and
Vennemann, T. W.: Reconstructing paleoelevation in eroded
orogens, 6, 525–528, https://doi.org/10.1130/G20394.1, 2004.
Nekrasov, I. J., Sorokin, V. I., and Osadchii, E. G.: Fe and Zn partitioning
between stannite and sphalerite and its application in geothermometry, Phys.
Chem. Earth, 11, 739–742, https://doi.org/10.1016/0079-1946(79)90069-7, 1979.
Oliver, N. H. S. and Bons P. D.: Mechanisms of fluid flow and fluid–rock
interaction in fossil metamorphic hydrothermal systems inferred from
vein–wallrock patterns, geometry and microstructure, Geofluids, 1, 137–162,
2001.
Olsen, M. P., Scholz, C. H., and Léger, A.: Healing and sealing of a
simulated fault gouge under hydrothermal conditions: Implications for fault
healing, J. Geophys. Res., 103, 7421, https://doi.org/10.1029/97JB03402, 1998.
Prando, F., Menegon, L., Anderson, M. W., Marchesini, B., Mattila, J., and Viola, G.:
Fluid-mediated, brittle-ductile deformation at seismogenic depth: Part 2 – The microstructural record of oscillations of differential stress and fluid pressure in a shear zone in a nuclear waste repository (Olkiluoto Island, Finland), Solid Earth, in preparation, 2019.
Roedder, E.: Fluid Inclusions, Mineralogical Society of America, 1984.
Roedder, E. and Bodnar, R. J.: Geologic determinations from fluid inclusion
studies, Annu. Rev. Earth Planet. Sc., 8, 263–301, 1980.
Rolandone, F. and Jaupart, C.: The distributions of slip rate and ductile
deformation in a strike-slip shear zone, Geophys. J. Int., 148, 179–192,
https://doi.org/10.1046/j.1365-246X.2002.01574.x, 2002.
Rosso, K. M. and Bodnar, R. J.: Microthermometric and Raman spectroscopic
detection limits of CO2 in fluid inclusions and the Raman spectroscopic
characterization of CO2, Geochim. Cosmochim. Ac., 59, 3961–3975,
https://doi.org/10.1016/0016-7037(95)94441-H, 1995.
Scheffer, C., Tarantola, A., Vanderhaeghe, O., Rigaudier, T., and Photiades,
A.: CO2 flow during orogenic gravitational collapse: Syntectonic
decarbonation and fl uid mixing at the ductile-brittle transition, Chem.
Geol., 450, 248–263, https://doi.org/10.1016/j.chemgeo.2016.12.005, 2017a.
Scheffer, C., Tarantola, A., Vanderhaeghe, O., Voudouris, P., Rigaudier, T.,
Photiades, A., Morin, D., and Alloucherie, A.: The Lavrion Pb-Zn-Fe-Cu-Ag
detachment-related district (Attica, Greece): Structural control on
hydrothermal flow and element transfer-deposition, Tectonophysics, 717,
607–627, https://doi.org/10.1016/j.tecto.2017.06.029, 2017b.
Selverstone, J., Franz, G., Thomas, S., and Getty, S.: Fluid variability in 2
GPa eclogites as an indicator of fluid behavior during subduction, Contrib. Mineral. Petr., 112, 341–357, 1992.
Selverstone, J., Axen, G. J., and Bartley, J. M: Fluid inclusion constraints on
the kinematics of footwall uplift beneath the Brebber Line normal fault,
estern Alps, Tectonics, 14, 264–278, 1995.
Shimizu, M. and Shikazono, N.: Iron and zinc partitioning between coexisting
stannite and sphalerite: a possible indicator of temperature and sulfur
fugacity, Miner. Deposita, 20, 314–320, 1985.
Scholz, C. H.: The Mechanics of Earthquakes and Faulting, Cambridge,
Cambridge University Press, 1990.
Sibson, R. H.: Earthquake faulting as a structural process, J. Struct. Geol.,
11, 1–14, https://doi.org/10.1016/0191-8141(89)90032-1, 1989.
Sibson, R. H.: Fault-valve behavior and the hydrostatic-lithostatic fluid
pressure interface, Earth Sci. Rev., 32, 141–144,
https://doi.org/10.1016/0012-8252(92)90019-P, 1992a.
Sibson, R. H.: Implications of fault-valve behaviour for rupture nucleation
and recurrence, Tectonophysics, 211, 283–293, 1992b.
Sibson, R. H.: Load-strengthening versus load-weakening faulting, J. Struct.
Geol., 15, 123–128, https://doi.org/10.1016/0191-8141(93)90090-W, 1993.
Sibson, R. H.: Structural permeability of fluid-driven fault-fracture meshes,
J. Struct. Geol, 18, 1031–1042, https://doi.org/10.1016/0191-8141(96)00032-6, 1996.
Sibson, R. H., Robert, F., and Poulsen, K. H.: High-angle reverse faults,
fluid-pressure cycling, and mesothermal gold-quartz deposits, Geology,
16, 551–555, https://doi.org/10.1130/0091-7613(1988)016<0551:HARFFP>2.3.CO;2, 1988.
Siebenaller, L., Boiron, M. C., Vanderhaeghe, O., Hibsch, C., Jessell, M. W.,
Andre-Mayer, A. S., France-Lanord, C., and Photiades, A.: Fluid record of rock
exhumation across the brittle-ductile transition during formation of a
Metamorphic Core Complex (Naxos Island, Cyclades, Greece), J. Metamorph.
Geol., 31, 313–338, https://doi.org/10.1111/jmg.12023, 2013.
Skyttä, P. and Torvela, T.: Brittle reactivation of ductile precursor
structures: The role of incomplete structural transposition at a nuclear
waste disposal site, Olkiluoto, Finland, J. Struct. Geol., 116, 253–259,
https://doi.org/10.1016/j.jsg.2018.06.009, 2018.
Spruzeniece, L. and Piazolo, S.: Strain localization in brittle-ductile shear zones: fluid-abundant vs. fluid-limited
conditions (an example from Wyangala area, Australia), Solid Earth, 6, 881–901, https://doi.org/10.5194/se-6-881-2015, 2015.
Steele-MacInnis, M., Lecumberri-Sanchez, P., and Bodnar, R. J.:
HokieFlincs_H2O-NaCl: A Microsoft Excel spreadsheet for
interpreting microthermometric data from fluid inclusions based on the PVTX
properties of H2O-NaCl, Comput. Geosci., 49, 334–337,
https://doi.org/10.1016/j.cageo.2012.01.022, 2012.
Sterner, S. M. and Bodnar J.: Synthetic fluid inclusions – VII.
Re-equilibration of fluid inclusions in quartz during laboratory-simulated
metamorphic burial and uplift, J. Metamorph. Geol., 7, 243–260, 1989.
Suominen, V.: The chronostratigraphy of southern Finland, with special
reference to Postjotnian and Subjotnian diabases, Bull. Geol. Surv. Finl.,
356, 100, 1991.
Tarantola, A., Diamond, L. W., and Stünitz, H.: Modification of fluid
inclusions in quartz by deviatoric stress I: Experimentally induced changes
in inclusion shapes and microstructures, Contrib. Mineral. Petr., 160,
825–843, https://doi.org/10.1007/s00410-010-0509-z, 2010.
Tchalenko, J. S.: Similarities between Shear Zones of Different Magnitudes,
Geol. Soc. Am. Bull., 81, 1625–1640,
https://doi.org/10.1130/0016-7606(1970)81[1625:SBSZOD]2.0.CO;2, 1970.
Tenthorey, E. and Cox, S. F.: Cohesive strengthening of fault zones during
the interseismic period: An experimental study, J. Geophys. Res.-Sol. Ea.,
111, 1–14, https://doi.org/10.1029/2005JB004122, 2006.
Trepmann, C. A. and Stöckhert, B.: Quartz microstructures developed
during non-steady state plastic flowat rapidly decaying stress and strain
rate, J. Struct. Geol., 25, 2035–2051,
https://doi.org/10.1016/S0191-8141(03)00073-7, 2003.
Trepmann, C. A. and Stöckhert, B.: Short-wavelength undulatory extinction in quartz recording coseismic deformation in the middle crust – an
experimental study, Solid Earth, 4, 263–276, https://doi.org/10.5194/se-4-263-2013, 2013.
Trepmann, C. A., Stöckhert, B., Dorner, D., Moghadam, R. H., Küster,
M., and Röller, K.: Simulating coseismic deformation of quartz in the
middle crust and fabric evolution during postseismic stress relaxation – An
experimental study, Tectonophysics, 442, 83–104,
https://doi.org/10.1016/j.tecto.2007.05.005, 2007.
Trepmann, C. A., Hsu, C., Hentschel, F., Döhler, K., Schneider, C., and
Wichmann, V.: Recrystallization of quartz after low-temperature plasticity –
The record of stress relaxation below the seismogenic zone, J. Struct. Geol.,
95, 77–92, https://doi.org/10.1016/j.jsg.2016.12.004, 2017.
Van Noten, K., Muchez, P., and Sintubin, M.: Stress-state evolution of the
brittle upper crust during compressional tectonic inversion as defined by
successive quartz vein types (High-Ardenne slate belt, Germany), J. Geol.
Soc. London, 168, 407–422, https://doi.org/10.1144/0016-76492010-112.Stress-state,
2011.
Van den Kerkhof, A., Kronz, A., and Simon, K.: Deciphering fluid inclusions in
high-grade rocks, Geosci. Front., 5, 683–695,
https://doi.org/10.1016/j.gsf.2014.03.005, 2014.
Viola, G., Mancktelow, N. S., and Miller, J. A.: Cyclic frictional-viscous
slip oscillations along the base of an advancing nappe complex: Insights into
brittle-ductile nappe emplacement mechanisms from the Naukluft Nappe Complex,
central Namibia, Tectonics, 25, 1–20, https://doi.org/10.1029/2005TC001939, 2006.
Viola, G., Venvik Ganerød, G., and Wahlgren, C. H.: Unraveling 1.5 Ga of
brittle deformation history in the Laxemar-Simpevarp area, southeast Sweden:
A contribution to the Swedish site investigation study for the disposal of
highly radioactive nuclear waste, Tectonics, 28, 1–29,
https://doi.org/10.1029/2009TC002461, 2009.
Viola, G., Mattila, J., Zwingmann, H., Todd, A., and Raven, M.: Structural and
K/Ar Illite Geochronological Constraints on the Brittle Deformation History
of the Olkiluoto Region, Southwest Finland, Posiva Working Report 2011,
Posiva Oy, Eurajoki, 2011.
Viola, G., Scheiber, T., Fredin, O., Zwingmann, H., Margreth, A., and Knies,
J.: Deconvoluting complex structural histories archived in brittle fault
zones, Nat. Commun., 7, 1–10, https://doi.org/10.1038/ncomms13448, 2016.
Vityk, M. O. and Bodnar, R. J.: Textural evolution of synthetic fluid
inclusions in quartz during reequilibration, with applications to tectonic
reconstruction, Contrib. Mineral. Petr., 121, 309–323,
https://doi.org/10.1007/BF02688246, 1995.
Vityk, M. O. and Bodnar, R. J.: Statistical microthermometry of synthetic
fluid inclusions in quartz during decompression reequilibration, Contrib. Mineral. Petr., 132, 149–162, https://doi.org/10.1007/s004100050413, 1998.
Vityk, M. O., Bodnar, R. J., and Schmidt, C. S.: Fluid inclusion as a
tectonothermobarometers: Relation between pressure-tempreture history and
reequilibration morphology during crystal thickening, Geology, 22, 731–734,
https://doi.org/10.1130/0091-7613(1994)022<0731:FIATRB>2.3.CO, 1994.
Wehrens, P., Berger, A., Peters, M., Spillmann, T., and Herwegh, M.:
Deformation at the frictional-viscous transition: Evidence for cycles of
fluid-assisted embrittlement and ductile deformation in the granitoid crust,
Tectonophysics, 693, 66–84, https://doi.org/10.1016/j.tecto.2016.10.022, 2016.
Wilkins, R. W. T. and Barkas, J. P.: Fluid inclusions, Deformation and
Recrystallization in Granite Tectonites, Contrib. Mineral. Petrol., 65,
293–299, 1978.
Short summary
We documented the role of fluids in the initial embrittlement of the Svecofennian basement and subsequent strain localization and fault evolution at the brittle–ductile transition zone. We studied the fault rocks of a deeply exhumed fault system characterized by mixed brittle–ductile deformation. Results from fluid inclusions, mineral chemistry, and geothermometry of synkinematic minerals document the ingress of distinct fluid batches and fluid pressure oscillations.
We documented the role of fluids in the initial embrittlement of the Svecofennian basement and...