T13E:
Strain Localization in the Lithosphere: From Experiments to Nature II

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Session ID#: 16557

Session Description:
Strain localization occurs throughout the lithosphere and spans orders of magnitude in scale. In the upper crust, seismic and aseismic brittle faults are the primary form of localization; at higher temperatures, ductile processes dominate. A more complete understanding of processes resulting in strain localization can be provided by microfabrics. However, the interpretation of fabric found in naturally-deformed rocks can be challenging because of the complex interplay of factors such as composition, temperature, stress, and strain-rate. Due to the better control of these factors in laboratory experiments, experimental studies enable to link the observed microfabrics to those found in nature and draw conclusions towards the operative deformation mechanisms, allowing further understanding of faulting processes, earthquake dynamics and deformation localization. In this session, we invite contributions from field observations, laboratory experiments, and numerical modeling constraining deformation mechanisms and mechanical and physical properties of rocks in brittle and ductile regimes during localization processes.
Primary Convener:  Marieke Rempe, Ruhr University Bochum, Bochum, Germany
Conveners:  Anna Rogowitz, University of Vienna, Vienna, Austria, Luiz F. G. Morales, Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum GFZ, Potsdam, Germany and Giulio Di Toro, University of Manchester, SEAES, Manchester, United Kingdom
Chairs:  Anna Rogowitz, University of Vienna, Vienna, Austria and Marieke Rempe, Ruhr University Bochum, Bochum, Germany
OSPA Liaison:  Giulio Di Toro, University of Manchester, SEAES, Manchester, United Kingdom

Cross-Listed:
  • MR - Mineral and Rock Physics
Index Terms:

8012 High strain deformation zones [STRUCTURAL GEOLOGY]
8030 Microstructures [STRUCTURAL GEOLOGY]
8159 Rheology: crust and lithosphere [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Understanding Earthquake Slip Surface Distribution in a Lithologically Heterogeneous Shear Zone (145287)
Erik Young, McGill University, Earth & Planetary Sciences, Montreal, QC, Canada and Christie D Rowe, McGill University, Dept of Earth and Planetary Sciences, Montreal, QC, Canada
Migmatites to mylonites – Crustal deformation mechanisms in the Western Gneiss Region, Norway (124777)
Amicia Lisbeth Lee1, Taija Torvela2, Geoffrey Edward Lloyd2 and Andrew Walker2, (1)University of Leeds, Leeds, LS2, United Kingdom, (2)University of Leeds, Leeds, United Kingdom
Grain Boundary Sliding in Deforming Wehrlite: Rheology and Microstructure (134165)
Ningli Zhao, Carnegie Institute for Science, Earth and Planets Laboratory, Washington, United States, Greg Hirth, Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, RI, United States, Reid F Cooper, Brown University, Providence, RI, United States and Seth C Kruckenberg, Boston College, Earth and Environmental Sciences, Chestnut Hill, MA, United States
Pressure Solution Creep and Textural Softening in Greenschist Facies Phyllonites (131825)
Robert P Wintsch1, Miriam Attenoukon2, Michael J. Kunk3, Ryan J. McAleer3, Bryan Wathen2 and Decheng Yi4, (1)Wesleyan University, Earth and Environmental Sciences, Middletown, Conn, United States, (2)Indiana University Bloomington, Bloomington, IN, United States, (3)USGS Headquarters, Reston, VA, United States, (4)NCKU National Cheng Kung University, Tainan, Taiwan
Rheological weakening due to phase mixing in olivine + orthopyroxene aggregates (132687)
Miki Tasaka, Niigata University, Niigata, Japan, Mark E Zimmerman, University of Minnesota Twin Cities, Minneapolis, United States and David L Kohlstedt, University of Minnesota Twin Cities, Minneapolis, MN, United States
Significance of grain bondary sliding for localization of ductile deformation in rocks (138328)
Alexandre Dimanov1, Mathieu Bourcier2, Ababacar Gaye3, Eva Héripré2, Michel Bornert4, Jean L Raphanel2, Hakim Gharbi2 and Wolfgang Ludwig5, (1)Laboratoire de Mécanique des Solides, UMR7649, Ecole Polytechnique, 91128, Palaiseau, France, (2)Laboratoire de Mécanique des Solides, UMR7649, Ecole Polytechnique, Mechanics, 91128, Palaiseau, France, (3)Laboratoire Navier, UMR8205, ENSPC, Champs sur Marne, France, (4)Ecole des Ponts ParisTech, Laboratoire Navier, Champs-sur-Marne, France, (5)Mateis, UMR5510, INSA-Lyon, Lyon, France
Interplay between fracture and flow at different scales in the middle and lower continental crust (Invited) (117679)
Neil S Mancktelow1, Giorgio Pennacchioni2, Friedrich Hawemann1, Sebastian Wex1 and Alfredo Camacho3, (1)ETH Zurich, Department of Earth Sciences, Zurich, Switzerland, (2)University of Padova, Department of Geosciences, Padova, Italy, (3)University of Manitoba, Winnipeg, MB, Canada

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