T34C:
Multidisciplinary Constraints on the Rheology and Dynamics of the Lithosphere and Asthenosphere I


Session ID#: 10714

Session Description:
The effective rheology of the lithosphere is of key importance for most tectonic processes. Despite remarkable advances in experimental rock-mechanics, the implications of laboratory data for tectonic processes are still not straightforward, as this typically requires extrapolations over many orders of magnitude in strain rate. Natural processes might also be controlled by local and regional conditions, including lithology, heterogeneities, fluid content, and the thermal structure of the lithosphere.

Our goal is to reconcile short-time/small-scale and long-time/large-scale observations with models to assess the rheological properties of the lithosphere and its role in geodynamic processes such as subduction, collision, or mantle-lithosphere interactions. We also welcome discussions of new methods to directly constrain rheology from geophysical and geological observations.

We invite researchers from different domains (rock mechanics, geodynamics, structural geology, geodesy and geophysics) to share their views on how we can improve our knowledge of the long-term rheology of the lithosphere.

Primary Convener:  Boris J P Kaus, Johannes Gutenberg University of Mainz, Institute for Geosciences, Mainz, Germany
Conveners:  Jessica M Warren, University of Delaware, Newark, DE, United States, E B Burov, University Pierre and Marie Curie Paris VI, Paris, France and Claire A Currie, University of Alberta, Department of Physics, Edmonton, AB, Canada
Chairs:  Boris J P Kaus, Johannes Gutenberg University of Mainz, Institute for Geosciences, Mainz, Germany, Jolante van Wijk, New Mexico Institute of Mining and Technology, Earth & Environmental Science, Socorro, United States and Andrew J Schaeffer, University of Ottawa, Department of Earth and Environmental Sciences, Ottawa, ON, Canada
OSPA Liaison:  Boris J P Kaus, Johannes Gutenberg University of Mainz, Institute for Geosciences, Mainz, Germany

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

1236 Rheology of the lithosphere and mantle [GEODESY AND GRAVITY]
3902 Creep and deformation [MINERAL PHYSICS]
8120 Dynamics of lithosphere and mantle: general [TECTONOPHYSICS]
8160 Rheology: general [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Testing How Depletion, Dehydration and Melt Affect Seismic Expressions of the Asthenosphere (Invited) (59088)
John J Armitage, Royal Holloway University of London, Egham, United Kingdom, Saskia D B Goes, Imperial College London, Department of Earth Science and Engineering, London, United Kingdom and James O S Hammond, Imperial College London, London, United Kingdom
The Seismic Properties of the Southeastern U.S. Asthenosphere (Invited) (60299)
Karen M Fischer1, Julia MacDougall2, Emily Hopper2, Lara S Wagner3 and Robert B Hawman4, (1)Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, RI, United States, (2)Brown University, Dept. of Earth, Environmental and Planetary Sciences, Providence, RI, United States, (3)Carnegie Institution for Science, Department of Terrestrial Magnetism, Washington, United States, (4)University of Georgia, Department of Geology, Athens, GA, United States
Interplay between Tectonic Plate Motions, Anisotropic Viscosity, and the Development of Rock Fabrics in the Asthenosphere (Invited) (60611)
Clinton P Conrad, University of Oslo, Centre for Planetary Habitability, Oslo, Norway and Lars N Hansen, University of Oxford, Department of Earth Sciences, Oxford, United Kingdom
What Petit-Spot Volcanoes Tell us about the Lithosphere-Asthenosphere Boundary? (Invited) (68325)
Sebastien Pilet1, Natsue Abe2, Laetitia Rochat3, Mary-Alix Kaczmarek4, Annelore Bessat3, Thibault Duretz1 and Othmar Muntener5, (1)University of Lausanne, Institute of Earth Sciences, Lausanne, Switzerland, (2)Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Mantle Drilling Promotion Office, MarE3, Yokohama, Japan, (3)University of Lausanne, Lausanne, Switzerland, (4)GET Géosciences Environnement Toulouse, Toulouse, France, (5)University of Lausanne, Institute of mineralogy and geochemistry, Lausanne, Switzerland
Impact of far-field stress distributions and thermo-rheological structure of continental lithosphere on mantle-lithosphere interactions. (69257)
E B Burov1, Alexander Koptev1, Taras Gerya2, Eric Calais3 and Sylvie D Leroy4, (1)University Pierre and Marie Curie Paris VI, Paris, France, (2)Geophysical Fluid Dynamics, Institute of Geophysics, ETH Zurich, Zurich, Switzerland, (3)Ecole Normale Supérieure, Université PSL, Paris, France, (4)University Pierre and Marie Curie Paris VI, istep, Paris, France
Constraints from Xenoliths on Cenozoic Deformation and Rheology of the Western North American Mantle Lithosphere (Invited) (61400)
Whitney M Behr, Structural Geology and Tectonics Group, Geological Institute, ETH Zurich, Zurich, Switzerland, Zurich, Switzerland, Douglas Smith, University of Texas at Austin, Austin, TX, United States and Rachel E Bernard, Amherst College, Amherst, MA, United States
How can geological datasets help us to choose between rheological behaviours suggested by experimental measurements? Examples from the Alpine Fault and the Japan Trench. (Invited) (71558)
Virginia Toy1, Carolyn J Boulton2, Genevieve L Coffey1, Paul H Denys3 and Robert McCaffrey4, (1)University of Otago, Dunedin, New Zealand, (2)Victoria University of Wellington, Wellington, New Zealand, (3)University of Otago, National School of Surveying, Dunedin, New Zealand, (4)Portland State University, Department of Geology, Portland, OR, United States
Early post-seismic deformation due to the 2015 M7.8 Gorkha (Nepal) earthquake: Constraints on rheology of the Tibetan lithosphere (Invited) (70988)
Yuri A Fialko, University of California San Diego, Scripps Institution of Oceanography, La Jolla, CA, United States and Kang Wang, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, United States

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