Nanocrystalline slip zones in calcite fault gouge show intense crystallographic preferred orientation: Crystal plasticity at sub-seismic slip rates at 18–150 °C
Berend A. VerberneHans de BresserAndré NiemeijerChristopher J. SpiersD. A. Matthijs de WinterOliver Plümper
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Research Article| August 01, 2013 Nanocrystalline slip zones in calcite fault gouge show intense crystallographic preferred orientation: Crystal plasticity at sub-seismic slip rates at 18–150 °C Berend A. Verberne; Berend A. Verberne * 1Department of Earth Sciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, Netherlands *E-mail: B.A.Verberne@uu.nl. Search for other works by this author on: GSW Google Scholar Johannes H.P. de Bresser; Johannes H.P. de Bresser 1Department of Earth Sciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, Netherlands Search for other works by this author on: GSW Google Scholar André R. Niemeijer; André R. Niemeijer 1Department of Earth Sciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, Netherlands Search for other works by this author on: GSW Google Scholar Christopher J. Spiers; Christopher J. Spiers 1Department of Earth Sciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, Netherlands Search for other works by this author on: GSW Google Scholar D.A. Matthijs de Winter; D.A. Matthijs de Winter 2Department of Biology, Utrecht University, P.O. Box 80056, 3508 TB Utrecht, Netherlands Search for other works by this author on: GSW Google Scholar Oliver Plümper Oliver Plümper 1Department of Earth Sciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, Netherlands Search for other works by this author on: GSW Google Scholar Author and Article Information Berend A. Verberne * 1Department of Earth Sciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, Netherlands Johannes H.P. de Bresser 1Department of Earth Sciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, Netherlands André R. Niemeijer 1Department of Earth Sciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, Netherlands Christopher J. Spiers 1Department of Earth Sciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, Netherlands D.A. Matthijs de Winter 2Department of Biology, Utrecht University, P.O. Box 80056, 3508 TB Utrecht, Netherlands Oliver Plümper 1Department of Earth Sciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, Netherlands *E-mail: B.A.Verberne@uu.nl. Publisher: Geological Society of America Received: 30 Nov 2012 Revision Received: 18 Mar 2013 Accepted: 21 Mar 2013 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2013 Geological Society of America Geology (2013) 41 (8): 863–866. https://doi.org/10.1130/G34279.1 Article history Received: 30 Nov 2012 Revision Received: 18 Mar 2013 Accepted: 21 Mar 2013 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Berend A. Verberne, Johannes H.P. de Bresser, André R. Niemeijer, Christopher J. Spiers, D.A. Matthijs de Winter, Oliver Plümper; Nanocrystalline slip zones in calcite fault gouge show intense crystallographic preferred orientation: Crystal plasticity at sub-seismic slip rates at 18–150 °C. Geology 2013;; 41 (8): 863–866. doi: https://doi.org/10.1130/G34279.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract A central aim in fault mechanics is to understand the microphysical mechanisms controlling aseismic-seismic transitions in fault gouges, and to identify microstructural indicators for such transitions. We present new data on the slip stability of calcite fault gouges, and on microstructural development down to the nanometer scale. Our experiments consisted of direct shear tests performed dry at slip rates of 0.1–10 µm/s, at a constant normal stress of 50 MPa, at 18–150 °C. The results show a transition from stable to (potentially) unstable slip above ∼80 °C. All samples recovered showed an optical microstructure characterized by narrow, 30–40-µm-wide, Riedel and boundary shear bands marked by extreme grain comminution, and a crystallographic preferred orientation (CPO). Boundary shear bands, sectioned using FIB-SEM (focused ion beam scanning electron microscopy), revealed angular grain fragments decreasing from 10 to 20 µm at the outer margins to ∼0.3 µm in the shear band core, where dense aggregates of nanograins also occurred. Transmission electron microscopy, applied to foils extracted from boundary shears using FIB-SEM, combined with the optical CPO, showed that these aggregates consist of calcite nanocrystals, 5–20 nm in size, with the (104) dislocation glide system oriented parallel to the shear plane and direction. Our results suggest that the mechanisms controlling slip include cataclasis and localized crystal plasticity. Because crystal plasticity is strongly thermally activated, we infer that the transition to velocity-weakening slip is likely due to enhanced crystal plasticity at >80 °C. This implies that tectonically active limestone terrains will tend to be particularly prone to shallow-focus seismicity. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.Keywords:
Nanocrystalline material
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