Articles | Volume 10, issue 1
https://doi.org/10.5194/se-10-95-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-10-95-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
17 Jan 2019
Research article |
| 17 Jan 2019
Deformation of feldspar at greenschist facies conditions – the record of mylonitic pegmatites from the Pfunderer Mountains, Eastern Alps
Felix Hentschel
CORRESPONDING AUTHOR
Department for Earth and Environmental Sciences,
Ludwig-Maximilians-Universität München, Munich, Germany
Claudia A. Trepmann
Department for Earth and Environmental Sciences,
Ludwig-Maximilians-Universität München, Munich, Germany
Emilie Janots
Univ. Grenoble 1, ISTerre, Grenoble, France
Related authors
Felix Hentschel, Emilie Janots, Claudia A. Trepmann, Valerie Magnin, and Pierre Lanari
Eur. J. Mineral., 32, 521–544, https://doi.org/10.5194/ejm-32-521-2020, https://doi.org/10.5194/ejm-32-521-2020, 2020
Short summary
Short summary
We analysed apatite–allanite/epidote coronae around monazite and xenotime in deformed Permian pegmatites from the Austroalpine basement. Microscopy, chemical analysis and EBSD showed that these coronae formed by dissolution–precipitation processes during deformation of the host rocks. Dating of monazite and xenotime confirmed the magmatic origin of the corona cores, while LA-ICP-MS dating of allanite established a date of ~ 60 Ma for corona formation and deformation in the Austroalpine basement.
Felix Hentschel, Emilie Janots, Claudia A. Trepmann, Valerie Magnin, and Pierre Lanari
Eur. J. Mineral., 32, 521–544, https://doi.org/10.5194/ejm-32-521-2020, https://doi.org/10.5194/ejm-32-521-2020, 2020
Short summary
Short summary
We analysed apatite–allanite/epidote coronae around monazite and xenotime in deformed Permian pegmatites from the Austroalpine basement. Microscopy, chemical analysis and EBSD showed that these coronae formed by dissolution–precipitation processes during deformation of the host rocks. Dating of monazite and xenotime confirmed the magmatic origin of the corona cores, while LA-ICP-MS dating of allanite established a date of ~ 60 Ma for corona formation and deformation in the Austroalpine basement.
Christian A. Bergemann, Edwin Gnos, Alfons Berger, Emilie Janots, and Martin J. Whitehouse
Solid Earth, 11, 199–222, https://doi.org/10.5194/se-11-199-2020, https://doi.org/10.5194/se-11-199-2020, 2020
Short summary
Short summary
Metamorphic domes are areas in a mountain chain that were unburied and where deeper parts of the crust rose to the surface. The Lepontine Dome in the Swiss and Italian Alps is such a place, and it is additionally bordered on two sides by shear zones where crustal blocks moved past each other. To determine when these tectonic movements happened, we measured the ages of monazite crystals that form in fluid-filled pockets inside the rocks during these movements of exhumation and deformation.
Emilie Janots, Alexis Grand'Homme, Matthias Bernet, Damien Guillaume, Edwin Gnos, Marie-Christine Boiron, Magali Rossi, Anne-Magali Seydoux-Guillaume, and Roger De Ascenção Guedes
Solid Earth, 10, 211–223, https://doi.org/10.5194/se-10-211-2019, https://doi.org/10.5194/se-10-211-2019, 2019
Short summary
Short summary
This geochronological and thermometric study reveals unusually hot fluids in an Alpine-type fissure of granite from the external crystalline massif (Western Alps). The fluid is estimated to be 150-250 °C hotter than the host rock and requires a dynamic fluid pathway at mid-crustal conditions in the ductile regime. This fluid circulation resets the zircon fission track thermochronometer, but only at the fissure contact. Thermal disturbances due to advective heating appear to be localized.
C. A. Trepmann, J. Renner, and A. Druiventak
Solid Earth, 4, 423–450, https://doi.org/10.5194/se-4-423-2013, https://doi.org/10.5194/se-4-423-2013, 2013
J. Bial and C. A. Trepmann
Solid Earth, 4, 315–330, https://doi.org/10.5194/se-4-315-2013, https://doi.org/10.5194/se-4-315-2013, 2013
C. A. Trepmann and B. Stöckhert
Solid Earth, 4, 263–276, https://doi.org/10.5194/se-4-263-2013, https://doi.org/10.5194/se-4-263-2013, 2013
Related subject area
Subject area: Tectonic plate interactions, magma genesis, and lithosphere deformation at all scales | Editorial team: Structural geology and tectonics, paleoseismology, rock physics, experimental deformation | Discipline: Tectonics
The influence of crustal strength on rift geometry and development – insights from 3D numerical modelling
Construction of the Ukrainian Carpathian wedge from low-temperature thermochronology and tectono-stratigraphic analysis
Analogue modelling of basin inversion: a review and future perspectives
Insights into the interaction of a shale with CO2
Magnetic Fabric Analyses of Basin Inversion: A Sandbox Modelling Approach
Tectonostratigraphic evolution of the Slyne Basin
Control of crustal strength, tectonic inheritance, and stretching/ shortening rates on crustal deformation and basin reactivation: insights from laboratory models
Late Cretaceous–early Palaeogene inversion-related tectonic structures at the northeastern margin of the Bohemian Massif (southwestern Poland and northern Czechia)
The analysis of slip tendency of major tectonic faults in Germany
Earthquake ruptures and topography of the Chilean margin controlled by plate interface deformation
Late Quaternary faulting in the southern Matese (Italy): implications for earthquake potential and slip rate variability in the southern Apennines
Rare earth elements associated with carbonatite–alkaline complexes in western Rajasthan, India: exploration targeting at regional scale
Structural complexities and tectonic barriers controlling recent seismic activity in the Pollino area (Calabria–Lucania, southern Italy) – constraints from stress inversion and 3D fault model building
The Mid Atlantic Appalachian Orogen Traverse: a comparison of virtual and on-location field-based capstone experiences
Chronology of thrust propagation from an updated tectono-sedimentary framework of the Miocene molasse (western Alps)
Orogenic lithosphere and slabs in the greater Alpine area – interpretations based on teleseismic P-wave tomography
Ground-penetrating radar signature of Quaternary faulting: a study from the Mt. Pollino region, southern Apennines, Italy
U–Pb dating of middle Eocene–Pliocene multiple tectonic pulses in the Alpine foreland
Detrital zircon provenance record of the Zagros mountain building from the Neotethys obduction to the Arabia–Eurasia collision, NW Zagros fold–thrust belt, Kurdistan region of Iraq
The Subhercynian Basin: an example of an intraplate foreland basin due to a broken plate
Late to post-Variscan basement segmentation and differential exhumation along the SW Bohemian Massif, central Europe
Holocene surface-rupturing earthquakes on the Dinaric Fault System, western Slovenia
Contribution of gravity gliding in salt-bearing rift basins – a new experimental setup for simulating salt tectonics under the influence of sub-salt extension and tilting
Thick- and thin-skinned basin inversion in the Danish Central Graben, North Sea – the role of deep evaporites and basement kinematics
Complex rift patterns, a result of interacting crustal and mantle weaknesses, or multiphase rifting? Insights from analogue models
Interactions of plutons and detachments: a comparison of Aegean and Tyrrhenian granitoids
Insights from elastic thermobarometry into exhumation of high-pressure metamorphic rocks from Syros, Greece
Stress rotation – impact and interaction of rock stiffness and faults
Late Cretaceous to Paleogene exhumation in central Europe – localized inversion vs. large-scale domal uplift
Kinematics and extent of the Piemont–Liguria Basin – implications for subduction processes in the Alps
Effects of basal drag on subduction dynamics from 2D numerical models
Hydrocarbon accumulation in basins with multiple phases of extension and inversion: examples from the Western Desert (Egypt) and the western Black Sea
Long-wavelength late-Miocene thrusting in the north Alpine foreland: implications for late orogenic processes
A reconstruction of Iberia accounting for Western Tethys–North Atlantic kinematics since the late-Permian–Triassic
The enigmatic curvature of Central Iberia and its puzzling kinematics
Control of 3-D tectonic inheritance on fold-and-thrust belts: insights from 3-D numerical models and application to the Helvetic nappe system
Plio-Quaternary tectonic evolution of the southern margin of the Alboran Basin (Western Mediterranean)
Surface deformation relating to the 2018 Lake Muir earthquake sequence, southwest Western Australia: new insight into stable continental region earthquakes
Seismic reflection data reveal the 3D structure of the newly discovered Exmouth Dyke Swarm, offshore NW Australia
Cenozoic deformation in the Tauern Window (Eastern Alps) constrained by in situ Th-Pb dating of fissure monazite
Uncertainties in break-up markers along the Iberia–Newfoundland margins illustrated by new seismic data
Tectonic inheritance controls nappe detachment, transport and stacking in the Helvetic nappe system, Switzerland: insights from thermomechanical simulations
Can subduction initiation at a transform fault be spontaneous?
The Geodynamic World Builder: a solution for complex initial conditions in numerical modeling
From mapped faults to fault-length earthquake magnitude (FLEM): a test on Italy with methodological implications
Lithosphere tearing along STEP faults and synkinematic formation of lherzolite and wehrlite in the shallow subcontinental mantle
A systematic comparison of experimental set-ups for modelling extensional tectonics
Improving subduction interface implementation in dynamic numerical models
The Bortoluzzi Mud Volcano (Ionian Sea, Italy) and its potential for tracking the seismic cycle of active faults
The Ulakhan fault surface rupture and the seismicity of the Okhotsk–North America plate boundary
Thomas B. Phillips, John B. Naliboff, Ken J. W. McCaffrey, Sophie Pan, Jeroen van Hunen, and Malte Froemchen
Solid Earth, 14, 369–388, https://doi.org/10.5194/se-14-369-2023, https://doi.org/10.5194/se-14-369-2023, 2023
Short summary
Short summary
Continental crust comprises bodies of varying strength, formed through numerous tectonic events. When subject to extension, these areas produce distinct rift and fault systems. We use 3D models to examine how rifts form above
strongand
weakareas of crust. We find that faults become more developed in weak areas. Faults are initially stopped at the boundaries with stronger areas before eventually breaking through. We relate our model observations to rift systems globally.
Marion Roger, Arjan de Leeuw, Peter van der Beek, Laurent Husson, Edward R. Sobel, Johannes Glodny, and Matthias Bernet
Solid Earth, 14, 153–179, https://doi.org/10.5194/se-14-153-2023, https://doi.org/10.5194/se-14-153-2023, 2023
Short summary
Short summary
We study the construction of the Ukrainian Carpathians with LT thermochronology (AFT, AHe, and ZHe) and stratigraphic analysis. QTQt thermal models are combined with burial diagrams to retrieve the timing and magnitude of sedimentary burial, tectonic burial, and subsequent exhumation of the wedge's nappes from 34 to ∼12 Ma. Out-of-sequence thrusting and sediment recycling during wedge building are also identified. This elucidates the evolution of a typical wedge in a roll-back subduction zone.
Frank Zwaan, Guido Schreurs, Susanne J. H. Buiter, Oriol Ferrer, Riccardo Reitano, Michael Rudolf, and Ernst Willingshofer
Solid Earth, 13, 1859–1905, https://doi.org/10.5194/se-13-1859-2022, https://doi.org/10.5194/se-13-1859-2022, 2022
Short summary
Short summary
When a sedimentary basin is subjected to compressional tectonic forces after its formation, it may be inverted. A thorough understanding of such
basin inversionis of great importance for scientific, societal, and economic reasons, and analogue tectonic models form a key part of our efforts to study these processes. We review the advances in the field of basin inversion modelling, showing how the modelling results can be applied, and we identify promising venues for future research.
Eleni Stavropoulou and Lyesse Laloui
Solid Earth, 13, 1823–1841, https://doi.org/10.5194/se-13-1823-2022, https://doi.org/10.5194/se-13-1823-2022, 2022
Short summary
Short summary
Shales are identified as suitable caprock formations for geolocigal CO2 storage thanks to their low permeability. Here, small-sized shale samples are studied under field-representative conditions with X-ray tomography. The geochemical impact of CO2 on calcite-rich zones is for the first time visualised, the role of pre-existing micro-fissures in the CO2 invasion trapping in the matererial is highlighted, and the initiation of micro-cracks when in contact with anhydrous CO2 is demonstrated.
Thorben Schöfisch, Hemin Koyi, and Bjarne Almqvist
EGUsphere, https://doi.org/10.5194/egusphere-2022-1258, https://doi.org/10.5194/egusphere-2022-1258, 2022
Short summary
Short summary
Magnetic-fabric analysis provides information about the reorientation of magnetic grains and is applied to three sandbox models that simulate different stages of basin inversion. The analysed magnetic fabrics reflect the different developed structures and provides insights in the different deformed stages of basin inversion. It is a first attempt of applying magnetic-fabric analyses to basin inversion sandbox models, but shows the possibility of applying it to such models.
Conor M. O'Sullivan, Conrad J. Childs, Muhammad M. Saqab, John J. Walsh, and Patrick M. Shannon
Solid Earth, 13, 1649–1671, https://doi.org/10.5194/se-13-1649-2022, https://doi.org/10.5194/se-13-1649-2022, 2022
Short summary
Short summary
The Slyne Basin is a sedimentary basin located offshore north-western Ireland. It formed through a long and complex evolution involving distinct periods of extension. The basin is subdivided into smaller basins, separated by deep structures related to the ancient Caledonian mountain-building event. These deep structures influence the shape of the basin as it evolves in a relatively unique way, where early faults follow these deep structures, but later faults do not.
Benjamin Guillaume, Guido M. Gianni, Jean-Jacques Kermarrec, and Khaled Bock
Solid Earth, 13, 1393–1414, https://doi.org/10.5194/se-13-1393-2022, https://doi.org/10.5194/se-13-1393-2022, 2022
Short summary
Short summary
Under tectonic forces, the upper part of the crust can break along different types of faults, depending on the orientation of the applied stresses. Using scaled analogue models, we show that the relative magnitude of compressional and extensional forces as well as the presence of inherited structures resulting from previous stages of deformation control the location and type of faults. Our results gives insights into the tectonic evolution of areas showing complex patterns of deformation.
Andrzej Głuszyński and Paweł Aleksandrowski
Solid Earth, 13, 1219–1242, https://doi.org/10.5194/se-13-1219-2022, https://doi.org/10.5194/se-13-1219-2022, 2022
Short summary
Short summary
Old seismic data recently reprocessed with modern software allowed us to study at depth the Late Cretaceous tectonic structures in the Permo-Mesozoic rock sequences in the Sudetes. The structures formed in response to Iberia collision with continental Europe. The NE–SW compression undulated the crystalline basement top and produced folds, faults and joints in the sedimentary cover. Our results are of importance for regional geology and in prospecting for deep thermal waters.
Luisa Röckel, Steffen Ahlers, Birgit Müller, Karsten Reiter, Oliver Heidbach, Andreas Henk, Tobias Hergert, and Frank Schilling
Solid Earth, 13, 1087–1105, https://doi.org/10.5194/se-13-1087-2022, https://doi.org/10.5194/se-13-1087-2022, 2022
Short summary
Short summary
Reactivation of tectonic faults can lead to earthquakes and jeopardize underground operations. The reactivation potential is linked to fault properties and the tectonic stress field. We create 3D geometries for major faults in Germany and use stress data from a 3D geomechanical–numerical model to calculate their reactivation potential and compare it to seismic events. The reactivation potential in general is highest for NNE–SSW- and NW–SE-striking faults and strongly depends on the fault dip.
Nadaya Cubas, Philippe Agard, and Roxane Tissandier
Solid Earth, 13, 779–792, https://doi.org/10.5194/se-13-779-2022, https://doi.org/10.5194/se-13-779-2022, 2022
Short summary
Short summary
Earthquake extent prediction is limited by our poor understanding of slip deficit patterns. From a mechanical analysis applied along the Chilean margin, we show that earthquakes are bounded by extensive plate interface deformation. This deformation promotes stress build-up, leading to earthquake nucleation; earthquakes then propagate along smoothed fault planes and are stopped by heterogeneously distributed deformation. Slip deficit patterns reflect the spatial distribution of this deformation.
Paolo Boncio, Eugenio Auciello, Vincenzo Amato, Pietro Aucelli, Paola Petrosino, Anna C. Tangari, and Brian R. Jicha
Solid Earth, 13, 553–582, https://doi.org/10.5194/se-13-553-2022, https://doi.org/10.5194/se-13-553-2022, 2022
Short summary
Short summary
We studied the Gioia Sannitica normal fault (GF) within the southern Matese fault system (SMF) in southern Apennines (Italy). It is a fault with a long slip history that has experienced recent reactivation or acceleration. Present activity has resulted in late Quaternary fault scarps and Holocene surface faulting. The maximum slip rate is ~ 0.5 mm/yr. Activation of the 11.5 km GF or the entire 30 km SMF can produce up to M 6.2 or M 6.8 earthquakes, respectively.
Malcolm Aranha, Alok Porwal, Manikandan Sundaralingam, Ignacio González-Álvarez, Amber Markan, and Karunakar Rao
Solid Earth, 13, 497–518, https://doi.org/10.5194/se-13-497-2022, https://doi.org/10.5194/se-13-497-2022, 2022
Short summary
Short summary
Rare earth elements (REEs) are considered critical mineral resources for future industrial growth due to their short supply and rising demand. This study applied an artificial-intelligence-based technique to target potential REE-deposit hosting areas in western Rajasthan, India. Uncertainties associated with the prospective targets were also estimated to aid decision-making. The presented workflow can be applied to similar regions elsewhere to locate potential zones of REE mineralisation.
Daniele Cirillo, Cristina Totaro, Giusy Lavecchia, Barbara Orecchio, Rita de Nardis, Debora Presti, Federica Ferrarini, Simone Bello, and Francesco Brozzetti
Solid Earth, 13, 205–228, https://doi.org/10.5194/se-13-205-2022, https://doi.org/10.5194/se-13-205-2022, 2022
Short summary
Short summary
The Pollino region is a highly seismic area of Italy. Increasing the geological knowledge on areas like this contributes to reducing risk and saving lives. We reconstruct the 3D model of the faults which generated the 2010–2014 seismicity integrating geological and seismological data. Appropriate relationships based on the dimensions of the activated faults suggest that they did not fully discharge their seismic potential and could release further significant earthquakes in the near future.
Steven Whitmeyer, Lynn Fichter, Anita Marshall, and Hannah Liddle
Solid Earth, 12, 2803–2820, https://doi.org/10.5194/se-12-2803-2021, https://doi.org/10.5194/se-12-2803-2021, 2021
Short summary
Short summary
Field trips in the Stratigraphy, Structure, Tectonics (SST) course transitioned to a virtual format in Fall 2020, due to the COVID pandemic. Virtual field experiences (VFEs) were developed in web Google Earth and were evaluated in comparison with on-location field trips via an online survey. Students recognized the value of VFEs for revisiting outcrops and noted improved accessibility for students with disabilities. Potential benefits of hybrid field experiences were also indicated.
Amir Kalifi, Philippe Hervé Leloup, Philippe Sorrel, Albert Galy, François Demory, Vincenzo Spina, Bastien Huet, Frédéric Quillévéré, Frédéric Ricciardi, Daniel Michoux, Kilian Lecacheur, Romain Grime, Bernard Pittet, and Jean-Loup Rubino
Solid Earth, 12, 2735–2771, https://doi.org/10.5194/se-12-2735-2021, https://doi.org/10.5194/se-12-2735-2021, 2021
Short summary
Short summary
Molasse deposits, deposited and deformed at the western Alpine front during the Miocene (23 to 5.6 Ma), record the chronology of that deformation. We combine the first precise chronostratigraphy (precision of ∼0.5 Ma) of the Miocene molasse, the reappraisal of the regional structure, and the analysis of growth deformation structures in order to document three tectonic phases and the precise chronology of thrust westward propagation during the second one involving the Belledonne basal thrust.
Mark R. Handy, Stefan M. Schmid, Marcel Paffrath, Wolfgang Friederich, and the AlpArray Working Group
Solid Earth, 12, 2633–2669, https://doi.org/10.5194/se-12-2633-2021, https://doi.org/10.5194/se-12-2633-2021, 2021
Short summary
Short summary
New images from the multi-national AlpArray experiment illuminate the Alps from below. They indicate thick European mantle descending beneath the Alps and forming blobs that are mostly detached from the Alps above. In contrast, the Adriatic mantle in the Alps is much thinner. This difference helps explain the rugged mountains and the abundance of subducted and exhumed units at the core of the Alps. The blobs are stretched remnants of old ocean and its margins that reach down to at least 410 km.
Maurizio Ercoli, Daniele Cirillo, Cristina Pauselli, Harry M. Jol, and Francesco Brozzetti
Solid Earth, 12, 2573–2596, https://doi.org/10.5194/se-12-2573-2021, https://doi.org/10.5194/se-12-2573-2021, 2021
Short summary
Short summary
Past strong earthquakes can produce topographic deformations, often
memorizedin Quaternary sediments, which are typically studied by paleoseismologists through trenching. Using a ground-penetrating radar (GPR), we unveiled possible buried Quaternary faulting in the Mt. Pollino seismic gap region (southern Italy). We aim to contribute to seismic hazard assessment of an area potentially prone to destructive events as well as promote our workflow in similar contexts around the world.
Luca Smeraglia, Nathan Looser, Olivier Fabbri, Flavien Choulet, Marcel Guillong, and Stefano M. Bernasconi
Solid Earth, 12, 2539–2551, https://doi.org/10.5194/se-12-2539-2021, https://doi.org/10.5194/se-12-2539-2021, 2021
Short summary
Short summary
In this paper, we dated fault movements at geological timescales which uplifted the sedimentary successions of the Jura Mountains from below the sea level up to Earth's surface. To do so, we applied the novel technique of U–Pb geochronology on calcite mineralizations that precipitated on fault surfaces during times of tectonic activity. Our results document a time frame of the tectonic evolution of the Jura Mountains and provide new insight into the broad geological history of the Western Alps.
Renas I. Koshnaw, Fritz Schlunegger, and Daniel F. Stockli
Solid Earth, 12, 2479–2501, https://doi.org/10.5194/se-12-2479-2021, https://doi.org/10.5194/se-12-2479-2021, 2021
Short summary
Short summary
As continental plates collide, mountain belts grow. This study investigated the provenance of rocks from the northwestern segment of the Zagros mountain belt to unravel the convergence history of the Arabian and Eurasian plates. Provenance data synthesis and field relationships suggest that the Zagros Mountains developed as a result of the oceanic crust emplacement on the Arabian continental plate, followed by the Arabia–Eurasia collision and later uplift of the broader region.
David Hindle and Jonas Kley
Solid Earth, 12, 2425–2438, https://doi.org/10.5194/se-12-2425-2021, https://doi.org/10.5194/se-12-2425-2021, 2021
Short summary
Short summary
Central western Europe underwent a strange episode of lithospheric deformation, resulting in a chain of small mountains that run almost west–east across the continent and that formed in the middle of a tectonic plate, not at its edges as is usually expected. Associated with these mountains, in particular the Harz in central Germany, are marine basins contemporaneous with the mountain growth. We explain how those basins came to be as a result of the mountains bending the adjacent plate.
Andreas Eberts, Hamed Fazlikhani, Wolfgang Bauer, Harald Stollhofen, Helga de Wall, and Gerald Gabriel
Solid Earth, 12, 2277–2301, https://doi.org/10.5194/se-12-2277-2021, https://doi.org/10.5194/se-12-2277-2021, 2021
Short summary
Short summary
We combine gravity anomaly and topographic data with observations from thermochronology, metamorphic grades, and the granite inventory to detect patterns of basement block segmentation and differential exhumation along the southwestern Bohemian Massif. Based on our analyses, we introduce a previously unknown tectonic structure termed Cham Fault, which, together with the Pfahl and Danube shear zones, is responsible for the exposure of different crustal levels during late to post-Variscan times.
Christoph Grützner, Simone Aschenbrenner, Petra Jamšek
Rupnik, Klaus Reicherter, Nour Saifelislam, Blaž Vičič, Marko Vrabec, Julian Welte, and Kamil Ustaszewski
Solid Earth, 12, 2211–2234, https://doi.org/10.5194/se-12-2211-2021, https://doi.org/10.5194/se-12-2211-2021, 2021
Short summary
Short summary
Several large strike-slip faults in western Slovenia are known to be active, but most of them have not produced strong earthquakes in historical times. In this study we use geomorphology, near-surface geophysics, and fault excavations to show that two of these faults had surface-rupturing earthquakes during the Holocene. Instrumental and historical seismicity data do not capture the strongest events in this area.
Michael Warsitzka, Prokop Závada, Fabian Jähne-Klingberg, and Piotr Krzywiec
Solid Earth, 12, 1987–2020, https://doi.org/10.5194/se-12-1987-2021, https://doi.org/10.5194/se-12-1987-2021, 2021
Short summary
Short summary
A new analogue modelling approach was used to simulate the influence of tectonic extension and tilting of the basin floor on salt tectonics in rift basins. Our results show that downward salt flow and gravity gliding takes place if the flanks of the rift basin are tilted. Thus, extension occurs at the basin margins, which is compensated for by reduced extension and later by shortening in the graben centre. These outcomes improve the reconstruction of salt-related structures in rift basins.
Torsten Hundebøl Hansen, Ole Rønø Clausen, and Katrine Juul Andresen
Solid Earth, 12, 1719–1747, https://doi.org/10.5194/se-12-1719-2021, https://doi.org/10.5194/se-12-1719-2021, 2021
Short summary
Short summary
We have analysed the role of deep salt layers during tectonic shortening of a group of sedimentary basins buried below the North Sea. Due to the ability of salt to flow over geological timescales, the salt layers are much weaker than the surrounding rocks during tectonic deformation. Therefore, complex structures formed mainly where salt was present in our study area. Our results align with findings from other basins and experiments, underlining the importance of salt tectonics.
Frank Zwaan, Pauline Chenin, Duncan Erratt, Gianreto Manatschal, and Guido Schreurs
Solid Earth, 12, 1473–1495, https://doi.org/10.5194/se-12-1473-2021, https://doi.org/10.5194/se-12-1473-2021, 2021
Short summary
Short summary
We used laboratory experiments to simulate the early evolution of rift systems, and the influence of structural weaknesses left over from previous tectonic events that can localize new deformation. We find that the orientation and type of such weaknesses can induce complex structures with different orientations during a single phase of rifting, instead of requiring multiple rifting phases. These findings provide a strong incentive to reassess the tectonic history of various natural examples.
Laurent Jolivet, Laurent Arbaret, Laetitia Le Pourhiet, Florent Cheval-Garabédian, Vincent Roche, Aurélien Rabillard, and Loïc Labrousse
Solid Earth, 12, 1357–1388, https://doi.org/10.5194/se-12-1357-2021, https://doi.org/10.5194/se-12-1357-2021, 2021
Short summary
Short summary
Although viscosity of the crust largely exceeds that of magmas, we show, based on the Aegean and Tyrrhenian Miocene syn-kinematic plutons, how the intrusion of granites in extensional contexts is controlled by crustal deformation, from magmatic stage to cold mylonites. We show that a simple numerical setup with partial melting in the lower crust in an extensional context leads to the formation of metamorphic core complexes and low-angle detachments reproducing the observed evolution of plutons.
Miguel Cisneros, Jaime D. Barnes, Whitney M. Behr, Alissa J. Kotowski, Daniel F. Stockli, and Konstantinos Soukis
Solid Earth, 12, 1335–1355, https://doi.org/10.5194/se-12-1335-2021, https://doi.org/10.5194/se-12-1335-2021, 2021
Short summary
Short summary
Constraining the conditions at which rocks form is crucial for understanding geologic processes. For years, the conditions under which rocks from Syros, Greece, formed have remained enigmatic; yet these rocks are fundamental for understanding processes occurring at the interface between colliding tectonic plates (subduction zones). Here, we constrain conditions under which these rocks formed and show they were transported to the surface adjacent to the down-going (subducting) tectonic plate.
Karsten Reiter
Solid Earth, 12, 1287–1307, https://doi.org/10.5194/se-12-1287-2021, https://doi.org/10.5194/se-12-1287-2021, 2021
Short summary
Short summary
The influence and interaction of elastic material properties (Young's modulus, Poisson's ratio), density and low-friction faults on the resulting far-field stress pattern in the Earth's crust is tested with generic models. A Young's modulus contrast can lead to a significant stress rotation. Discontinuities with low friction in homogeneous models change the stress pattern only slightly, away from the fault. In addition, active discontinuities are able to compensate stress rotation.
Hilmar von Eynatten, Jonas Kley, István Dunkl, Veit-Enno Hoffmann, and Annemarie Simon
Solid Earth, 12, 935–958, https://doi.org/10.5194/se-12-935-2021, https://doi.org/10.5194/se-12-935-2021, 2021
Eline Le Breton, Sascha Brune, Kamil Ustaszewski, Sabin Zahirovic, Maria Seton, and R. Dietmar Müller
Solid Earth, 12, 885–913, https://doi.org/10.5194/se-12-885-2021, https://doi.org/10.5194/se-12-885-2021, 2021
Short summary
Short summary
The former Piemont–Liguria Ocean, which separated Europe from Africa–Adria in the Jurassic, opened as an arm of the central Atlantic. Using plate reconstructions and geodynamic modeling, we show that the ocean reached only 250 km width between Europe and Adria. Moreover, at least 65 % of the lithosphere subducted into the mantle and/or incorporated into the Alps during convergence in Cretaceous and Cenozoic times comprised highly thinned continental crust, while only 35 % was truly oceanic.
Lior Suchoy, Saskia Goes, Benjamin Maunder, Fanny Garel, and Rhodri Davies
Solid Earth, 12, 79–93, https://doi.org/10.5194/se-12-79-2021, https://doi.org/10.5194/se-12-79-2021, 2021
Short summary
Short summary
We use 2D numerical models to highlight the role of basal drag in subduction force balance. We show that basal drag can significantly affect velocities and evolution in our simulations and suggest an explanation as to why there are no trends in plate velocities with age in the Cenozoic subduction record (which we extracted from recent reconstruction using GPlates). The insights into the role of basal drag will help set up global models of plate dynamics or specific regional subduction models.
William Bosworth and Gábor Tari
Solid Earth, 12, 59–77, https://doi.org/10.5194/se-12-59-2021, https://doi.org/10.5194/se-12-59-2021, 2021
Short summary
Short summary
Many of the world's hydrocarbon resources are found in rifted sedimentary basins. Some rifts experience multiple phases of extension and inversion. This results in complicated oil and gas generation, migration, and entrapment histories. We present examples of basins in the Western Desert of Egypt and the western Black Sea that were inverted multiple times, sometimes separated by additional phases of extension. We then discuss how these complex deformation histories impact exploration campaigns.
Samuel Mock, Christoph von Hagke, Fritz Schlunegger, István Dunkl, and Marco Herwegh
Solid Earth, 11, 1823–1847, https://doi.org/10.5194/se-11-1823-2020, https://doi.org/10.5194/se-11-1823-2020, 2020
Short summary
Short summary
Based on thermochronological data, we infer thrusting along-strike the northern rim of the Central Alps between 12–4 Ma. While the lithology influences the pattern of thrusting at the local scale, we observe that thrusting in the foreland is a long-wavelength feature occurring between Lake Geneva and Salzburg. This coincides with the geometry and dynamics of the attached lithospheric slab at depth. Thus, thrusting in the foreland is at least partly linked to changes in slab dynamics.
Paul Angrand, Frédéric Mouthereau, Emmanuel Masini, and Riccardo Asti
Solid Earth, 11, 1313–1332, https://doi.org/10.5194/se-11-1313-2020, https://doi.org/10.5194/se-11-1313-2020, 2020
Short summary
Short summary
We study the Iberian plate motion, from the late Permian to middle Cretaceous. During this time interval, two oceanic systems opened. Geological evidence shows that the Iberian domain preserved the propagation of these two rift systems well. We use geological evidence and pre-existing kinematic models to propose a coherent kinematic model of Iberia that considers both the Neotethyan and Atlantic evolutions. Our model shows that the Europe–Iberia plate boundary was made of two rift systems.
Daniel Pastor-Galán, Gabriel Gutiérrez-Alonso, and Arlo B. Weil
Solid Earth, 11, 1247–1273, https://doi.org/10.5194/se-11-1247-2020, https://doi.org/10.5194/se-11-1247-2020, 2020
Short summary
Short summary
Pangea was assembled during Devonian to early Permian times and resulted in a large-scale and winding orogeny that today transects Europe, northwestern Africa, and eastern North America. This orogen is characterized by an
Sshape corrugated geometry in Iberia. This paper presents the advances and milestones in our understanding of the geometry and kinematics of the Central Iberian curve from the last decade with particular attention paid to structural and paleomagnetic studies.
Richard Spitz, Arthur Bauville, Jean-Luc Epard, Boris J. P. Kaus, Anton A. Popov, and Stefan M. Schmalholz
Solid Earth, 11, 999–1026, https://doi.org/10.5194/se-11-999-2020, https://doi.org/10.5194/se-11-999-2020, 2020
Short summary
Short summary
We apply three-dimensional (3D) thermo-mechanical numerical simulations of the shortening of the upper crustal region of a passive margin in order to investigate the control of 3D laterally variable inherited structures on fold-and-thrust belt evolution and associated nappe formation. The model is applied to the Helvetic nappe system of the Swiss Alps. Our results show a 3D reconstruction of the first-order tectonic evolution showing the fundamental importance of inherited geological structures.
Manfred Lafosse, Elia d'Acremont, Alain Rabaute, Ferran Estrada, Martin Jollivet-Castelot, Juan Tomas Vazquez, Jesus Galindo-Zaldivar, Gemma Ercilla, Belen Alonso, Jeroen Smit, Abdellah Ammar, and Christian Gorini
Solid Earth, 11, 741–765, https://doi.org/10.5194/se-11-741-2020, https://doi.org/10.5194/se-11-741-2020, 2020
Short summary
Short summary
The Alboran Sea is one of the most active region of the Mediterranean Sea. There, the basin architecture records the effect of the Africa–Eurasia plates convergence. We evidence a Pliocene transpression and a more recent Pleistocene tectonic reorganization. We propose that main driving force of the deformation is the Africa–Eurasia convergence, rather than other geodynamical processes. It highlights the evolution and the geometry of the present-day Africa–Eurasia plate boundary.
Dan J. Clark, Sarah Brennand, Gregory Brenn, Matthew C. Garthwaite, Jesse Dimech, Trevor I. Allen, and Sean Standen
Solid Earth, 11, 691–717, https://doi.org/10.5194/se-11-691-2020, https://doi.org/10.5194/se-11-691-2020, 2020
Short summary
Short summary
A magnitude 5.3 reverse-faulting earthquake in September 2018 near Lake Muir in southwest Western Australia was followed after 2 months by a collocated magnitude 5.2 strike-slip event. The first event produced a ~ 5 km long and up to 0.5 m high west-facing surface rupture, and the second triggered event deformed but did not rupture the surface. The earthquake sequence was the ninth to have produced surface rupture in Australia. None of these show evidence for prior Quaternary surface rupture.
Craig Magee and Christopher Aiden-Lee Jackson
Solid Earth, 11, 579–606, https://doi.org/10.5194/se-11-579-2020, https://doi.org/10.5194/se-11-579-2020, 2020
Short summary
Short summary
Injection of vertical sheets of magma (dyke swarms) controls tectonic and volcanic processes on Earth and other planets. Yet we know little of the 3D structure of dyke swarms. We use seismic reflection data, which provides ultrasound-like images of Earth's subsurface, to study a dyke swarm in 3D for the first time. We show that (1) dyke injection occurred in the Late Jurassic, (2) our data support previous models of dyke shape, and (3) seismic data provides a new way to view and study dykes.
Emmanuelle Ricchi, Christian A. Bergemann, Edwin Gnos, Alfons Berger, Daniela Rubatto, Martin J. Whitehouse, and Franz Walter
Solid Earth, 11, 437–467, https://doi.org/10.5194/se-11-437-2020, https://doi.org/10.5194/se-11-437-2020, 2020
Short summary
Short summary
This study investigates Cenozoic deformation during cooling and exhumation of the Tauern metamorphic and structural dome, Eastern Alps, through Th–Pb dating of fissure monazite-(Ce). Fissure (or hydrothermal) monazite-(Ce) typically crystallizes in a temperature range of 400–200 °C. Three major episodes of monazite growth occurred at approximately 21, 17, and 12 Ma, corroborating previous crystallization and cooling ages.
Annabel Causer, Lucía Pérez-Díaz, Jürgen Adam, and Graeme Eagles
Solid Earth, 11, 397–417, https://doi.org/10.5194/se-11-397-2020, https://doi.org/10.5194/se-11-397-2020, 2020
Short summary
Short summary
Here we discuss the validity of so-called “break-up” markers along the Newfoundland margin, challenging their perceived suitability for plate kinematic reconstructions of the southern North Atlantic. We do this on the basis of newly available seismic transects across the Southern Newfoundland Basin. Our new data contradicts current interpretations of the extent of oceanic lithosphere and illustrates the need for a differently constraining the plate kinematics of the Iberian plate pre M0 times.
Dániel Kiss, Thibault Duretz, and Stefan Markus Schmalholz
Solid Earth, 11, 287–305, https://doi.org/10.5194/se-11-287-2020, https://doi.org/10.5194/se-11-287-2020, 2020
Short summary
Short summary
In this paper, we investigate the physical mechanisms of tectonic nappe formation by high-resolution numerical modeling. Tectonic nappes are key structural features of many mountain chains which are packets of rocks displaced, sometimes even up to 100 km, from their original position. However, the physical mechanisms involved are not fully understood. We solve numerical equations of fluid and solid dynamics to improve our knowledge. The results are compared with data from the Helvetic Alps.
Diane Arcay, Serge Lallemand, Sarah Abecassis, and Fanny Garel
Solid Earth, 11, 37–62, https://doi.org/10.5194/se-11-37-2020, https://doi.org/10.5194/se-11-37-2020, 2020
Short summary
Short summary
We propose a new exploration of the concept of
spontaneouslithospheric collapse at a transform fault (TF) by performing a large study of conditions allowing instability of the thicker plate using 2-D thermomechanical simulations. Spontaneous subduction is modelled only if extreme mechanical conditions are assumed. We conclude that spontaneous collapse of the thick older plate at a TF evolving into mature subduction is an unlikely process of subduction initiation at modern Earth conditions.
Menno Fraters, Cedric Thieulot, Arie van den Berg, and Wim Spakman
Solid Earth, 10, 1785–1807, https://doi.org/10.5194/se-10-1785-2019, https://doi.org/10.5194/se-10-1785-2019, 2019
Short summary
Short summary
Three-dimensional numerical modelling of geodynamic processes may benefit strongly from using realistic 3-D starting models that approximate, e.g. natural subduction settings in the geological past or at present. To this end, we developed the Geodynamic World Builder (GWB), which enables relatively straightforward parameterization of complex 3-D geometric structures associated with geodynamic processes. The GWB is an open-source community code designed to easily interface with geodynamic codes.
Fabio Trippetta, Patrizio Petricca, Andrea Billi, Cristiano Collettini, Marco Cuffaro, Anna Maria Lombardi, Davide Scrocca, Giancarlo Ventura, Andrea Morgante, and Carlo Doglioni
Solid Earth, 10, 1555–1579, https://doi.org/10.5194/se-10-1555-2019, https://doi.org/10.5194/se-10-1555-2019, 2019
Short summary
Short summary
Considering all mapped faults in Italy, empirical scaling laws between fault dimensions and earthquake magnitude are used at the national scale. Results are compared with earthquake catalogues. The consistency between our results and the catalogues gives credibility to the method. Some large differences between the two datasets suggest the validation of this experiment elsewhere.
Károly Hidas, Carlos J. Garrido, Guillermo Booth-Rea, Claudio Marchesi, Jean-Louis Bodinier, Jean-Marie Dautria, Amina Louni-Hacini, and Abla Azzouni-Sekkal
Solid Earth, 10, 1099–1121, https://doi.org/10.5194/se-10-1099-2019, https://doi.org/10.5194/se-10-1099-2019, 2019
Short summary
Short summary
Subduction-transform edge propagator (STEP) faults are the locus of continual lithospheric tearing at the edges of subducted slabs, resulting in sharp changes in the lithospheric thickness and triggering lateral and/or near-vertical mantle flow. Here, we study upper mantle rocks recovered from a STEP fault context by < 4 Ma alkali volcanism. We reconstruct how the microstructure developed during deformation and coupled melt–rock interaction, which are promoted by lithospheric tearing at depth.
Frank Zwaan, Guido Schreurs, and Susanne J. H. Buiter
Solid Earth, 10, 1063–1097, https://doi.org/10.5194/se-10-1063-2019, https://doi.org/10.5194/se-10-1063-2019, 2019
Short summary
Short summary
This work was inspired by an effort to numerically reproduce laboratory models of extension tectonics. We tested various set-ups to find a suitable analogue model and in the process systematically charted the impact of set-ups and boundary conditions on model results, a topic poorly described in existing scientific literature. We hope that our model results and the discussion on which specific tectonic settings they could represent may serve as a guide for future (analogue) modeling studies.
Dan Sandiford and Louis Moresi
Solid Earth, 10, 969–985, https://doi.org/10.5194/se-10-969-2019, https://doi.org/10.5194/se-10-969-2019, 2019
Short summary
Short summary
This study investigates approaches to implementing plate boundaries within a fluid dynamic framework, targeted at the evolution of subduction over many millions of years.
Marco Cuffaro, Andrea Billi, Sabina Bigi, Alessandro Bosman, Cinzia G. Caruso, Alessia Conti, Andrea Corbo, Antonio Costanza, Giuseppe D'Anna, Carlo Doglioni, Paolo Esestime, Gioacchino Fertitta, Luca Gasperini, Francesco Italiano, Gianluca Lazzaro, Marco Ligi, Manfredi Longo, Eleonora Martorelli, Lorenzo Petracchini, Patrizio Petricca, Alina Polonia, and Tiziana Sgroi
Solid Earth, 10, 741–763, https://doi.org/10.5194/se-10-741-2019, https://doi.org/10.5194/se-10-741-2019, 2019
Short summary
Short summary
The Ionian Sea in southern Italy is at the center of active convergence between the Eurasian and African plates, with many known
Mw > 7.0 earthquakes. Here, a recently discovered mud volcano (called the Bortoluzzi Mud Volcano or BMV) was surveyed during the Seismofaults 2017 cruise (May 2017). The BMV is the active emergence of crustal fluids probably squeezed up during the seismic cycle. As such, the BMV may potentially be used to track the seismic cycle of active faults.
David Hindle, Boris Sedov, Susanne Lindauer, and Kevin Mackey
Solid Earth, 10, 561–580, https://doi.org/10.5194/se-10-561-2019, https://doi.org/10.5194/se-10-561-2019, 2019
Short summary
Short summary
On one of the least studied boundaries between tectonic plates (North America–Okhotsk in northeastern Russia), which moves very similarly to the famous San Andreas fault in California, we have found the traces of earthquakes from the recent past, but before the time of historical records. This makes us a little more sure that the fault is still the place where movement between the plates takes place, and when it happens again, there could be dangerous earthquakes.
Cited articles
Abart, R., Heuser, D., and Habler, G.: Mechanisms of myrmekite formation:
case study from the Weinsberg granite, Moldanubian zone, Upper Austria,
Contrib. Mineral. Petr., 168, 1–15,
https://doi.org/10.1007/s00410-014-1074-7, 2014.
Bachmann, F., Hielscher, R., and Schaeben, H.: Texture Analysis with MTEX – Free and Open Source Software Toolbox, Solid State Phenomena, 160, 63–68, 2010.
Behrmann, J. H. and Mainprice, D.: Deformation mechanisms in a
high-temperature quartz-feldspar mylonite: evidence for superplastic flow in
the lower continental crust, Tectonophysics, 140, 297–305,
https://doi.org/10.1016/0040-1951(87)90236-8, 1987.
Bergmann, R., Chan, R. H., Hielscher, R., Persch, J., and Steidl, G.: Restoration of Manifold-Valued Images
by Half-Quadratic Minimization, Inverse Problems and Imaging, 10, 281–304, 2016.
Borsi, S., Del Moro, A., Sassi, F. P., Zanferrari, A., and Zirpoli, G.: New
geopetrologic and radiometric data on the Alpine history of the Austridic
continental margin south of the Tauern window (Eastern Alps), Memorie di
Scienze Geologiche, 32, 1–19, 1978.
Borsi, S., Del Moro, A., Sassi, F. P., and Zirpoli, G.: On the age of the
Vedrette di Ries (Rieserferner) massif and its geodynamic significance,
Geol. Rundsch., 68, 41–60, https://doi.org/10.1007/BF01821121, 1979.
Borsi, S., Del Moro, A., Sassi, F. P., Visona, D., and Zirpoli, G.: On the
existence of Hercynian aplites and pegmatites in the lower Aurina valley
(Ahrntal, Austrides, Eastern Alps), Neues Jahrbuch für Mineralogie, 11,
501–514, 1980.
Brace, W. and Kohlstedt, D. L.: Limits on lithospheric stress imposed by
laboratory experiments, J. Geophys. Res., 85, 6248–6252,
1980.
Brander, L., Svahnberg, H., and Piazolo, S.: Brittle-plastic deformation in
initially dry rocks at fluid-present conditions: transient behaviour of
feldspar at mid-crustal levels, Contrib. Mineral. Petr.,
163, 403–425, https://doi.org/10.1007/s00410-011-0677-5, 2011.
Bürgmann, R. and Dresen, G.: Rheology of the Lower Crust and Upper
Mantle: Evidence from Rock Mechanics, Geodesy, and Field Observations,
Annu. Rev. Earth Planet. Sci., 36, 531–567,
https://doi.org/10.1146/annurev.earth.36.031207.124326, 2008.
Burov, E. B.: Plate Rheology and Mechanics, 99–151, Elsevier,
Amsterdam, https://doi.org/10.1016/B978-044452748-6.00102-4, 2007.
Burov, E. B.: Rheology and strength of the lithosphere, Mar. Petrol. Geol., 28, 1402–1443, https://doi.org/10.1016/j.marpetgeo.2011.05.008,
2011.
Eberlei, T., Habler, G., Grasemann, B., and Abart, R.: Upper-greenschist
facies intragrain deformation of albite in mylonitic meta-pegmatite and the
influence of crystallographic anisotropy on microstructure formation,
J. Struct. Geol., 69, 47–58,
https://doi.org/10.1016/j.jsg.2014.10.001, 2014.
Fitz Gerald, J. and Stünitz, H.: Deformation of granitoids at low
metamorphic grade. I: Reactions and grain size reduction, Tectonophysics,
221, 269–297, https://doi.org/10.1016/0040-1951(93)90163-E, 1993.
Fliervoet, T. F.: Deformation Mechanisms in Fine Grained Quartzo-Feldspathic
Mylonites, Ph.D. thesis, Universiteit Utrecht, 1995.
Gapais, D.: Shear structures within deformed granites: mechanical and
thermal indicators, Geology, 17, 1144–1147,
https://doi.org/10.1130/0091-7613(1989)017<1144:SSWDGM>2.3.CO, 1989.
Gleason, G. C. and Tullis, J.: Improving flow laws and piezometers for
quartz and feldspar aggregates, Geophys. Res. Lett., 20,
2111–2114, https://doi.org/10.1029/93GL02236, 1993.
Groshong, H.: Low-temperature deformation mechanisms and their
interpretation, Geol. Soc. Am. Bull., 100, 1329–1360, 1988.
Habler, G., Thöni, M., and Grasemann, B.: Cretaceous metamorphism in the
Austroalpine Matsch Unit (Eastern Alps): The interrelation between
deformation and chemical equilibration processes, Mineral. Petrol., 97,
149–171, https://doi.org/10.1007/s00710-009-0094-x, 2009.
Hildyard, R. C., Prior, D. J., Mariani, E., and Faulkner, D. R.:
Characterization of microstructures and interpretation of flow mechanisms in
naturally deformed, fine-grained anhydrite by means of EBSD analysis,
Geological Society, London, Special Publications, 360, 237–255,
https://doi.org/10.1144/SP360.14, 2011.
Hirth, G., Teyssier, C., and Dunlap, W. J.: An evaluation of quartzite flow
laws based on comparisons between experimentally and naturally deformed
rocks, Int. J. Earth Sci., 90, 77–87,
https://doi.org/10.1007/s005310000152, 2001.
Hofmann, K., Kleinschrodt, R., Lippert, R., Mager, D., and Stöckhert,
B.: Geologische Karte des Altkristallins südlich des Tauernfensters
zwischen Pfunderer Tal und Tauferer Tal (Südtirol), Der Schlern, 57,
572–590, 1983.
Hoinkes, G., Koller, F., Rantitsch, G., Dachs, E., Höck, V., Neubauer,
F., and Schuster, R.: Alpine metamorphism of the Eastern Alps,
Schweiz. Miner. Petrog., 79,
155–181, 1999.
Hövelmann, J., Putnis, A., Geisler, T., Schmidt, B. C., and
Golla-Schindler, U.: The replacement of plagioclase feldspars by albite:
Observations from hydrothermal experiments, Contrib. Mineral. Petr., 159, 43–59, https://doi.org/10.1007/s00410-009-0415-4, 2010.
Ishii, K., Kanagawa, K., Shigematsu, N., and Okudaira, T.: High ductility of
K-feldspar and development of granitic banded ultramylonite in the Ryoke
metamorphic belt, SW Japan, J. Struct. Geol., 29, 1083–1098,
https://doi.org/10.1016/j.jsg.2007.02.008, 2007.
Jaoul, O. and Tullis, J.: The effect of varying water contents on the creep
behaviour of Heavitree Quartzite, J. Geophys. Res., 89,
4298–4312, https://doi.org/10.1029/JB089iB06p04298, 1984.
Jiang, Z., Prior, D. J., and Wheeler, J.: Albite crystallographic preferred
orientation and grain misorientation distribution in a low-grade mylonite:
implications for granular flow, J. Struct. Geol., 22,
1663–1674, https://doi.org/10.1016/S0191-8141(00)00079-1, 2000.
Jordan, P.: The rheology of polymineralic rocks – an approach, Geol.
Rundsch., 77, 285–294, https://doi.org/10.1007/BF01848690, 1988.
Kilian, R. and Heilbronner, R.: Analysis of crystallographic preferred
orientations of experimentally deformed Black Hills Quartzite, Solid Earth,
8, 1095–1117, https://doi.org/10.5194/se-8-1095-2017, 2017.
Kilian, R., Heilbronner, R., and Stünitz, H.: Quartz grain size
reduction in a granitoid rock and the transition from dislocation to
diffusion creep, J. Struct. Geol., 33, 1265–1284,
https://doi.org/10.1016/j.jsg.2011.05.004, 2011.
Kleinschrodt, R.: Quarzkorngefügeanalyse im Altkristallin südlich des
westlichen Tauernfensters (Südtirol_Italien), Erlanger Geologische Abhandlungen, 114, 1–82, 1987.
Kohlstedt, D. L.: Strength of the lithosphere: Constraints imposed by
laboratory experiments, J. Geophys. Res., 100, 17587–17602,
https://doi.org/10.1029/95JB01460, 1995.
Korolyuk, V. N. and Lepezin, G. G.: The coefficients of heterovalent
NaSi-CaAl interdiffusion in plagioclases, Russian Geol. Geophys.,
50, 1146–1152, https://doi.org/10.1016/j.rgg.2009.11.013, 2009.
Krakow, R., Bennett, R. J., Johnstone, D. N., Vukmanovic, Z.,
Solano-Alvarez, W.,Lainé, S. J., Einsle, J. F., Midgley, P. A., Rae, C.
M. F., and Hielscher, R.: On three-dimensional misorientation spaces, P. Roy. Soc. A,
473,
https://doi.org/10.1098/rspa.2017.0274, 2017.
Kruse, R. and Stünitz, H.: Dynamic recrystallization processes in
plagioclase porphyroclasts, J. Struct. Geol., 23, 1781–1802,
https://doi.org/10.1016/S0191-8141(01)00030-X, 2001.
Mainprice, D., Bachmann, F., Hielscher, R., and Schaeben, H.: Descriptive tools
for the analysis of texture projects with large datasets using MTEX:
strength, symmetry and components, Geological Society, London, Special
Publications, 409, 251–271, https://doi.org/10.1144/SP409.8,
2014.
Mancktelow, N. S., Stöckli, D., Grollimund, B., Müller, W.,
Fügenschuh, B., Viola, G., Seward, D., and Villa, I. M.: The DAV and
Periadriatic fault systems in the Eastern Alps south of the Tauern window,
Int. J. Earth Sci., 90, 593–622,
https://doi.org/10.1007/s005310000190, 2001.
Mclaren, A. and Pryer, L. L.: Microstructural investigation of the
interaction and interdependence of cataclastic and plastic mechanisms in
Feldspar crystals deformed in the semi-brittle field, Tectonophysics, 335,
1–15, https://doi.org/10.1016/S0040-1951(01)00042-7, 2001.
Mehl, L. and Hirth, G.: Plagioclase preferred orientation in layered
mylonites: Evaluation of flow laws for the lower crust, J. Geophys. Res.-Solid Earth, 113, 1–19,
https://doi.org/10.1029/2007JB005075, 2008.
Menegon, L., Pennacchioni, G., and Stünitz, H.: Nucleation and growth of
myrmekite during ductile shear deformation in metagranites, J. Metamorph. Geol., 24, 553–568,
https://doi.org/10.1111/j.1525-1314.2006.00654.x, 2006.
Menegon, L., Pennacchioni, G., and Spiess, R.: Dissolution-precipitation
creep of K-feldspar in mid-crustal granite mylonites, J. Struct.
Geol., 30, 565–579, https://doi.org/10.1016/j.jsg.2008.02.001, 2008.
Menegon, L., Stünitz, H., Nasipuri, P., Heilbronner, R., and Svahnberg,
H.: Transition from fracturing to viscous flow in granulite facies perthitic
feldspar (Lofoten, Norway), J. Struct. Geol., 48, 95–112,
https://doi.org/10.1016/j.jsg.2012.12.004, 2013.
Mukai, H., Austrheim, H., Putnis, C. V., and Putnis, A.: Textural Evolution
of Plagioclase Feldspar across a Shear Zone: Implications for Deformation
Mechanism and Rock Strength, J. Petrol., 55, 1457–1477,
https://doi.org/10.1093/petrology/egu030, 2014.
Müller, W., Mancktelow, N. S., and Meier, M.: Rb-Sr microchrons of
synkinematic mica in mylonites: an example from the DAV fault of the Eastern
Alps, Earth Planet. Sc. Lett., 180, 385–397,
https://doi.org/10.1016/S0012-821X(00)00167-9, 2000.
Nicolas, A. and Poirier, J. P.: Crystalline Plasticity and Solid State Flow in
Metamorphic Rocks, Wiley-Interscience, New York, 444 pp., 1976.
Norberg, N., Neusser, G., Wirth, R., and Harlov, D. E.: Microstructural
evolution during experimental albitization of K-rich alkali feldspar,
Contrib. Mineral. Petr., 162, 531–546,
https://doi.org/10.1007/s00410-011-0610-y, 2011.
Passchier, C. W. and Trouw, R. A.: Microtectonics, Springer Berlin
Heidelberg, Berlin, Heidelberg, https://doi.org/10.1007/978-3-662-08734-3,
2005.
Paterson, M.: Problems in the extrapolation of laboratory rheological data,
Tectonophysics, 133, 33–43,
1987.
Paterson, M. and Luan, F. C.: Quartzite rheology under geological
conditions, Geological Society, London, Special Publications, 54, 299–307, https://doi.org/10.1144/GSL.SP.1990.054.01.26, 1990.
Pfiffner, O. and Ramsay, J.: Constraints on geological strain rates:
Arguments from finite strain states of naturally deformed rocks, J. Geophys. Res., 87, 311–321, https://doi.org/10.1029/JB087iB01p00311,
1982.
Plümper, O. and Putnis, A.: The Complex Hydrothermal History of Granitic
Rocks: Multiple Feldspar Replacement Reactions under Subsolidus Conditions,
J. Petrol., 50, 967–987,
https://doi.org/10.1093/petrology/egp028, 2009.
Poirier, J.-P.: Creep of Crystals: High-Temperature Deformation Processes in
Metals, Ceramics and Minerals, Cambridge Earth ScienceSeries, Cambridge
University Press, https://doi.org/10.1017/CBO9780511564451, 1985.
Prior, D. J. and Wheeler, J.: Feldspar fabrics in a greenschist facies
albite-rich mylonite from electron backscatter diffraction,
Tectonophysics,303, 29–49, https://doi.org/10.1016/S0040-1951(98)00257-1,
1999.
Putnis, A.: Mineral Replacement Reactions, Reviews in Mineralogy and Geochemistry, 70, 87–124, https://doi.org/10.2138/rmg.2009.70.3, 2009.
Ratschbacher, L., Merle, O., Davy, P., and Cobbold, P.: Lateral extrusion in
the eastern Alps, Part 1: Boundary conditions and experiments scaled for
gravity, Tectonics, 10, 245–256, https://doi.org/10.1029/90TC02622, 1991.
Ree, J.-H., Kim, H. S., Han, R., and Jung, H.: Grain-size reduction of
feldspars by fracturing and neocrystallization in a low-grade granitic
mylonite and its rheological effect, Tectonophysics, 407, 227–237,
https://doi.org/10.1016/j.tecto.2005.07.010, 2005.
Rosenberg, C. L. and Stünitz, H.: Deformation and recrystallization of
plagioclase along a temperature gradient: an example from the Bergell
tonalite, J. Struct. Geol., 25, 389–408,
https://doi.org/10.1016/S0191-8141(02)00036-6, 2003.
Rutter, E. H. and Brodie, K.: Lithosphere rheology – a note of caution,
J. Struct. Geol., 13, 363–367,
https://doi.org/10.1016/0191-8141(91)90136-7, 1991.
Rybacki, E. and Dresen, G.: Deformation mechanism maps for feldspar rocks,
Tectonophysics, 382, 173–187, https://doi.org/10.1016/j.tecto.2004.01.006,
2004.
Schmid, S. M., Fügenschuh, B., Kissling, E., and Schuster, R.: Tectonic
map and overall architecture of the Alpine orogen, Eclogae Geol.
Helv., 97, 93–117, https://doi.org/10.1007/s00015-004-1113-x, 2004.
Schulz, B.: Jungalpidische Gefügeentwicklung entlang der
Defereggen-Antholz-Vals-Linie (Osttirol, Österreich), Jahrbuch der Geologischen Bundesanstalt, 132, 775–789, 1989.
Schulz, B.: Microstructural Evolution of Metapelites from the Austroalpine
Basement North of Staller Sattel During Pre-Alpine and Alpine Deformation
and Metamorphism (Eastern Tyrol, Austria), Jahrbuch der Geologischen
Bundesanstalt, 137, 197–212, 1994.
Schulz, B., Steenken, A., and Siegesmund, S.: Geodynamic evolution of an
Alpine terrane – the Austroalpine basement to the south of the Tauern Window
as a part of the Adriatic Plate (eastern Alps), Geological Society London,
Special Publications, 298, 5–44, https://doi.org/10.1144/SP298.2, 2008.
Schuster, R. and Stüwe, K.: Permian metamorphic event in the Alps,
Geology, 36, 603, https://doi.org/10.1130/G24703A.1, 2008.
Simpson, C. and Wintsch, R.: Evidence for deformation-induced K-feldspar
replacement by myrmekite, J. Metamorph. Geol., 7, 261–275,
https://doi.org/10.1111/j.1525-1314.1989.tb00588.x, 1989.
Sinha, S., Alsop, G. I., and Biswal, T.: The evolution and significance of
microfracturing within feldspars in low-grade granitic mylonites: A case
study from the Eastern Ghats Mobile Belt, India, J. Struct. Geol., 32, 1417–1429, https://doi.org/10.1016/j.jsg.2010.07.006, 2010.
Steenken, A., Siegesmund, S., and Heinrichs, T.: The emplacement of the
Rieserferner Pluton (Eastern Alps, Tyrol): Contraints from field
observations, magnetic fabrics and microstructures, J. Struct. Geol., 22, 1855–1873, https://doi.org/10.1016/S0191-8141(00)00071-7, 2000.
Stipp, M., Stünitz, H., Heilbronner, R., and Schmid, S. M.: The eastern
Tonale fault zone: a `natural laboratory' for crystal plastic deformation of
quartz over a temperature range from 250 to 700 ∘C, J. Struct. Geol., 24, 1861–1884,
https://doi.org/10.1016/S0191-8141(02)00035-4, 2002.
Stöckhert, B.: Deformation und retrograde Metamorphose im Altkristallin
S' des westlichen Tauerfensters (Südtirol), Ph.D. thesis,
Universität Erlangen-Nürnberg, 1982.
Stöckhert, B.: K-Ar determinations on muscovites and phengites from
deformed pegmatites, and the minimum age of Old Alpine deformation in the
Austridic basement to the South of the western Tauern Window (Ahrn valley,
Southern Tyrol, Eastern Alps), Neues Jahrbuch für Mineralogie/Abhandlungen, 150, 103–120, 1984.
Stöckhert, B.: Das Uttenheimer Pegmatit-Feld (Ostalpines Altkristallin,
Südtirol) Genese und alpine Überprägung, Erlanger Geologische
Abhandlungen, 114, 83–106, 1987.
Stöckhert, B., Brix, M. R., Kleinschrodt, R., Hurford, A. J., and Wirth,
R.: Thermochronometry and microstructures of quartz - a comparison with
experimental flow laws and predictions on the temperature of the
brittle-plastic transition, J. Struct. Geol., 21, 351–369,
https://doi.org/10.1016/S0191-8141(98)00114-X, 1999.
Stünitz, H.: Syndeformational recrystallization – dynamic or
compositionally induced?, Contrib. Mineral. Petr., 131,
219–236, https://doi.org/10.1007/s004100050390, 1998.
Stünitz, H. and Fitz Gerald, J.: Deformation of granitoids at low
metamorphic grade. II: Granular flow in albite-rich mylonites,
Tectonophysics, 221, 299–324,
https://doi.org/10.1016/0040-1951(93)90164-F, 1993.
Stünitz, H., Fitz Gerald, J., and Tullis, J.: Dislocation generation,
slip systems, and dynamic recrystallization in experimentally deformed
plagioclase single crystals, Tectonophysics, 372, 215–233,
https://doi.org/10.1016/S0040-1951(03)00241-5, 2003.
Thöni, M. and Miller, C.: Garnet Sm-Nd data from the Saualpe and the
Koralpe (Eastern Alps, Austria): Chronological and P-T constraints on the
thermal and tectonic history, J. Metamorph. Geol., 14, 453–466,
https://doi.org/10.1046/j.1525-1314.1996.05995.x, 1996.
Thöni, M. and Miller, C.: The “Permian event” in the Eastern European
Alps: Sm–Nd and P–T data recorded by multi-stage garnet from the Plankogel
unit, Chemical Geology, 260, 20–36,
https://doi.org/10.1016/j.chemgeo.2008.11.017, 2009.
Trepmann, C. A., Stöckhert, B., and Chakraborty, S.: Oligocene
trondhjemitic dikes in the Austroalpine basement of the Pfunderer Berge,
Südtirol – level of emplacement and metamorphic overprint, Eur. J. Mineral., 16, 641–659,
https://doi.org/10.1127/0935-1221/2004/0016-0641, 2004.
Tröger, W.: Optische Bestimmung der gesteinsbildenden Minerale. Teil I:
Bestimmungstabellen, Schweizerbart'sche Verlagsbuchhandlung, 5. edn.,
https://doi.org/10.1002/crat.2170180211, 1982.
Tsurumi, J., Hosonuma, H., and Kanagawa, K.: Strain localization due to a
positive feedback of deformation and myrmekite-forming reaction in granite
and aplite mylonites along the Hatagawa Shear Zone of NE Japan, J. Struct. Geol., 25, 557–574,
https://doi.org/10.1016/S0191-8141(02)00048-2, 2003.
Tullis, T. E. and Tullis, J.: Experimental Rock Deformation Techniques, pp.
297–324 American Geophysical Union, https://doi.org/10.1029/GM036p0297, 1986.
Tullis, J.: Deformation of Feldspars, in: Reviews in Mineralogy: Feldspar
Mineralogy, edited by: Ribbe, P. H., chap. 13, 297–323, The
Mineralogical Society of America, 1983.
Tullis, J. and Yund, R. A.: Dynamic recrystallization of feldspar: A
mechanism for ductile shear zone formation, Geology, 13, 238–241,
https://doi.org/10.1130/0091-7613(1985)13<238:DROFAM>2.0.CO;2, 1985.
Tullis, J. and Yund, R. A.: Transition from cataclastic flow to dislocation
creep of feldspar: Mechanisms and microstructures, Geology, 15, 606–609,
https://doi.org/10.1130/0091-7613(1987)15<606:TFCFTD>2.0.CO;2, 1987.
Tullis, J. and Yund, R. A.: The Brittle-Ductile Transition In Feldspar
Aggregates: An Experimental Study, Int. Geophys., 51, 89–117,
https://doi.org/10.1016/S0074-6142(08)62816-8, 1992.
Tullis, J., Yund, R. A., and Farver, J.: Deformation-enhanced fluid
distribution in feldspar aggregates and implications for ductile shear
zones, Geology, 24, 63–66,
https://doi.org/10.1130/0091-7613(1996)024<0063:DEFDIF>2.3.CO;2, 1996.
Voll, G.: Recrystallization of Quartz, Biotite and Feldspars from Erstfeld
to the Leventina Nappe, Swiss Alps, and its Geological Significance,
Schweiz. Miner. Petrog., 56,
641–647, 1976.
Wassmann, S. and Stöckhert, B.: Rheology of the plate interfaced –
dissolution precipitation creep in high pressure metamorphic rocks,
Tectonophysics, 608, 1–29, 2013.
Wheeler J., Mariani, E., Piazolo, S., Prior, D. J., Trimby, P., and Drury, M. R.:
The weighted Burgers vector: a new quantity for constraining dislocation
densities and types using electronbackscatter diffraction on 2D sections
through crystalline materials, J. Microsc., 233, 482–494, 2009.
White, S.: Tectonic deformation and recrystallisation of Oligoclase,
Contrib. Mineral. Petr., 50, 287–304,
https://doi.org/10.1007/BF00394854, 1975.
Yund, R. A.: Interdiffusion of NaSi-CaAl in peristerite, Phys. Chem. Miner., 13, 11–16, https://doi.org/10.1007/BF00307308, 1986.
Short summary
We used microscopy and electron backscatter diffraction to analyse the deformation behaviour of feldspar at greenschist facies conditions in mylonitic pegmatites of the Austroalpine basement. There are strong uncertainties about feldspar deformation, mainly because of the varying contributions of different deformation processes. We observed that deformation is mainly the result of coupled fracturing and dislocation glide, followed by growth and granular flow.
We used microscopy and electron backscatter diffraction to analyse the deformation behaviour of...
