T33H:
Creep Deformation in the Lithosphere: Fabrics, Rheology, and Derived Physical Properties I


Session ID#: 8153

Session Description:
Ductile deformation in Earth’s lithosphere is predominantly controlled by creep of anisotropic minerals. The interaction among different deformation mechanisms in rocks containing multiple phases and/or fluids, leads to complex rheological behaviors that we are far from completely understanding. In recent years, significant insight has been gained into the nature of high-strain zones and their impact on the strength of the lithosphere. Key processes include grain-size reduction, phase changes, presence/migration of fluids and melts, and development of CPOs. All these processes likely modify the physical properties of rocks, providing key information on the evolution of the lithosphere. The aim of this session is to bring together interdisciplinary contributions that aim the better understanding of the lithosphere rheology based in physical and chemical material properties. We welcome contributions that constrain deformation mechanisms, the role of fluids, and the physical and mechanical properties of rocks deformed in different conditions and tectonic settings.
Primary Convener:  Luiz F. G. Morales, Helmholtz Centre Potsdam, GFZ, Potsdam, Germany
Conveners:  Whitney M Behr, Structural Geology and Tectonics Group, Geological Institute, Zurich, Switzerland and Lars N Hansen, University of Oxford, Department of Earth Sciences, Oxford, United Kingdom
Chairs:  Lars N Hansen, University of Oxford, Department of Earth Sciences, Oxford, United Kingdom, Luiz F. G. Morales, Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum GFZ, Potsdam, Germany and Whitney M Behr, Structural Geology and Tectonics Group, Geological Institute, Zurich, Switzerland
OSPA Liaison:  Luiz F. G. Morales, Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum GFZ, Potsdam, Germany

Cross-Listed:
  • DI - Study of the Earth's Deep Interior
  • MR - Mineral and Rock Physics
Index Terms:

5112 Microstructure [PHYSICAL PROPERTIES OF ROCKS]
5120 Plasticity, diffusion, and creep [PHYSICAL PROPERTIES OF ROCKS]
8120 Dynamics of lithosphere and mantle: general [TECTONOPHYSICS]
8160 Rheology: general [TECTONOPHYSICS]

Abstracts Submitted to this Session:

In situ observation of crystallographic preferred orientation of deforming olivine at high pressure and high temperature (Invited) (58699)
Tomohiro Ohuchi1, Yu Nishihara2, Yusuke Seto3, Takaaki Kawazoe4, Masayuki Nishi2, Genta Maruyama5, Mika Hashimoto2, Yuji Higo6, Ken-ichi Funakoshi7, Akio Suzuki8, Takumi Kikegawa9 and Tetsuo Irifune1, (1)Ehime University, Geodynamics Research Center, Matsuyama, Japan, (2)Ehime University, Matsuyama, Japan, (3)Kobe University, Faculty of Science, Kobe, Japan, (4)University of Bayreuth, Bayerisches Geoinstitut, Bayreuth, Germany, (5)University of Tokyo, Bunkyo-ku, Japan, (6)Japan Synchrotron Radiation Research Institute, Kouto, Japan, (7)Japan Synchrotron Radiation Research Institute, Hyogo, Japan, (8)Tohoku University, Sendai, Japan, (9)High Energy Accelerator Research Organization, Tsukuba, Japan
Rheological weakening due to phase mixing in olivine + orthopyroxene rocks (64109)
Miki Tasaka, Kanazawa University, Earth Science Course, School of Natural System, Kanazawa, 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
Evidence of phase nucleation during olivine diffusion creep: a new perspective for mantle strain localization and Plate tectonics (69266)
Jacques Precigout1, Holger Stunitz2 and Nicole Le Breton1, (1)ISTO Institut des Sciences de la Terre d'Orléans, Orléans Cedex 2, France, (2)University of Tromsø, Department of Geology, Tromsø, Norway
Determining Grain-scale Vorticity Axes from Crystallographic Orientation Data (77189)
Dr. Zachary D Michels, PhD, University of Arizona, Tucson, AZ, United States, Seth C Kruckenberg, Boston College, Earth and Environmental Sciences, Chestnut Hill, MA, United States, Joshua R. Davis, Carleton College, Northfield, MN, United States and Basil Tikoff, Univ Wisconsin, Madison, United States
Water weakening in experimentally deformed milky quartz single crystals (Invited) (59115)
Holger Stunitz1, Anja Thust2, Ruediger Kilian2, Renee Heilbronner2, Harald Behrens3, Alexandre Tarantola4 and John D. Fitz Gerald5, (1)University of Tromsø, Department of Geology, Tromsø, Norway, (2)Basel University, Basel, Switzerland, (3)University of Hannover, Mineralogy, Hannover, Germany, (4)Univ. Lorraine, Nancy, France, (5)ANU, Canberra, Australia
Creep of quartz by dislocation and grain boundary processes (69197)
Junichi Fukuda, Texas A & M University College Station, College Station, TX, United States, Caleb W Holyoke III, University of Akron Main Campus, Akron, OH, United States and Andreas K Kronenberg, Texas A&M University, Department of Geology and Geophysics, College Station, United States
Stresses and pressures at the quartz-coesite transition in shear experiments (69138)
Bettina Richter1, Holger Stunitz2 and Renee Heilbronner1, (1)University of Basel, Basel, Switzerland, (2)University of Tromsø, Department of Geology, Tromsø, Norway
Stress states in subduction zones: Extrapolation of flow laws and piezometric relations of quartz to high-P/low-T metamorphic conditions (86662)
Ichiko Shimizu and Tadamasa Ueda, University of Tokyo, Bunkyo-ku, Japan

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