T017
Ductile deformation in the middle and lower crust: Integrating experimental and geologic observations to constrain crustal rheology
Session ID#: 78057
Session Description:
The strength of the middle to lower crust is fundamental to constraining the mechanical behaviour of the lithosphere, yet a clear framework of where and why the ductile crust is ‘strong’ or ‘weak’ has yet to be achieved. Field observations of deformed rocks exhumed from the crust suggest a variety of deformation mechanisms operate within various mineral phases across a broad range of conditions. These observations provide valuable geologic contexts, yet often lack quantitative constraints on material properties during deformation. Experimental studies characterize these properties, such as a mineral’s temperature dependent viscosity, and indicate a dependence on microstructural variables (e.g., dislocation density, grain size, crystallographic texture), fluid chemistry, and the occurrence of secondary phases. Integrating these two approaches yields a more complete picture of the ductile rheology of the middle and lower crust. In this session, we welcome field and experimental contributions focused on constraining crustal rheology.
Index Terms:
8120 Dynamics of lithosphere and mantle: general [TECTONOPHYSICS]
8159 Rheology: crust and lithosphere [TECTONOPHYSICS]
8160 Rheology: general [TECTONOPHYSICS]
8164 Stresses: crust and lithosphere [TECTONOPHYSICS]
Primary Convener: Leif Tokle, Brown University, Providence, RI, United States
Conveners: Cailey Brown Condit, Rice University, Houston, TX, United States, Matej Pec, Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, Cambridge, MA, United States and Omero Orlandini, Univ of Colorado, Centennial, CO, United States
Primary Liaison: Leif Tokle, Brown University, Providence, RI, United States
Rupture Directivity Analysis of the 2018 Hokkaido Eastern Iburi Earthquake and Its rheology Implication (487343)
Chong Zang, University of Science and Technology of China, School of Earth and Space Sciences, Hefei, China, Sidao Ni, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, State Key Laboratory of Geodesy and Earth's Dynamics, Wuhan,Hubei, China and Zhichao Shen, CalTech Seismological Laboratory, Pasadena, CA, United States
Significance of high-temperature deformational microstructures in quartz and ice (489844)
John P Platt1, Thomas M Mitchell2, David John Prior3, Marianne Negrini3, Sheng Fan3, Mark Jefferd4 and Blaise Robertson Winnard4, (1)University of Southern California, Earth Sciences, Los Angeles, CA, United States, (2)University College London, Department of Earth Sciences, London, United Kingdom, (3)University of Otago, Dunedin, New Zealand, (4)University College London, Rock and Ice Physics and Seismological Laboratory, London, United Kingdom
Normal grain growth of quartz by experiment and discussion on the effect of grain size reduction by deformation in natural conditions (497896)
Junichi Fukuda, Kobe University, Research Center for Inland Seas, Department of Planetology, Kobe, Japan, Hugues Raimbourg, ISTO Institut des Sciences de la Terre d'Orléans, Orléans Cedex 2, France, Ichiko Shimizu, Kyoto University, Division of Earth and Planetary Sciences, Sakyo-ku, Japan, Kai Neufeld, University of Tromsø, Department of Geosciences, Tromsø, Norway and Holger Stunitz, University of Tromsø, Department of Geology, Tromsø, Norway
Using subgrain-size piezometry to measure stress in polymineralic mylonites of the Great Slave Lake shear zone (512380)
Rellie Goddard1, Lars N Hansen2, David Wallis3, Brendan Joel Dyck4 and Kathryn M. Kumamoto1, (1)University of Oxford, Oxford, United Kingdom, (2)University of Oxford, Department of Earth Sciences, Oxford, United Kingdom, (3)Utrecht University, Department of Earth Sciences, Utrecht, Iceland, (4)University of Oxford, Earth Sciences, Oxford, United Kingdom
Reconciling Rheologies Inferred from Post-seismic Deformation across the Tibetan Plateau (523275)
Camilla Penney1,2, Jean-Philippe Avouac2 and Adriano Gualandi3,4, (1)University of Cambridge, Cambridge, United Kingdom, (2)California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States, (3)California Institute of Technology, Geological and Planetary Sciences, Pasadena, CA, United States, (4)NASA Jet Propulsion Laboratory, Pasadena, CA, United States
Brittle-viscous deformation and the earthquake cycle in the lower crust (Invited) (533151)
Luca Menegon, Plymouth University, School of Geography, Earth and Environmental Sciences, Plymouth, PL4, United Kingdom, Lucy Campbell, Plymouth University, Plymouth, United Kingdom, Ake Fagereng, University of Cape Town, Department of Geological Sciences, Cape Town, South Africa and Giorgio Pennacchioni, University of Padova, Department of Geosciences, Padova, Italy
The mechanical, rheological and mineralogical impact of microscale stress heterogeneities (535262)
Scott E Johnson1, Christopher C Gerbi1, Won Joon Song1 and Senthil S Vel2, (1)University of Maine, School of Earth and Climate Sciences, Orono, ME, United States, (2)University of Maine, Department of Mechanical Engineering, Orono, ME, United States
Grain Size Piezometry is Affected by Increasing Stress during Cooling (536974)
Hamid Soleymani, CUNY Graduate Center, New York, NY, United States, Steven B Kidder, CUNY City College, New York, NY, United States, Greg Hirth, Brown Univeristy, Department of Earth, Environmental, and Planetary Sciences, Providence, RI, United States and Gordana Garapic, SUNY College at New Paltz, Department of Geology, New Paltz, NY, United States
Experimental investigation of amphibole rheology and deformation mechanisms at deep crustal conditions (541191)
Cailey Brown Condit, Massachusetts Institute of Technology, Cambridge, MA, United States, Matej Pec, Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, Cambridge, MA, United States, Emily J Chin, UC San Diego, Scripps Institution of Oceanography, GRD, La Jolla, CA, United States and Teodora Mitroi, UNAVCO, Inc., Boulder, CO, United States
Do Plate Boundary Forces Drive Seismicity in Continental Interiors? Insights from a Study in Central-Western Europe (573396)
Lavinia Tunini, Ecole Normale Supérieure Paris, Department of Geosciences, Paris, France, Eric Calais, Ecole Normale Supérieure Paris, Paris, France, Frederic Ego, Agence Nationale pour la gestion des Déchets Radioactifs, Châtenay-Malabry, France, David Baumont, SEISTER, Montrouge, France and Philippe Combes, GEOTER SAS/Fugro Group, Castries, France
The strength of Southern California from rheological and geodynamical approaches (583450)
Laurent Montesi1, Kristel Izquierdo2, William E Holt3, Alireza Bahadori3 and William Joseph Shinevar4,5, (1)University of Maryland College Park, Department of Geology, College Park, MD, United States, (2)University of Maryland College Park, College Park, MD, United States, (3)Stony Brook University, Stony Brook, NY, United States, (4)Brown University, Providence, RI, United States, (5)Woods Hole Oceanographic Institution, Woods Hole, MA, United States
High-stress creep in amphibolite-facies ultramylonites hosting pseudotachylytes: ductile instability or brittle failure? (588737)
Simone Papa1, Giorgio Pennacchioni1, Luca Menegon2,3 and Marcel Thielmann4, (1)University of Padova, Department of Geosciences, Padova, Italy, (2)Plymouth University, School of Geography, Earth and Environmental Sciences, Plymouth, PL4, United Kingdom, (3)University of Oslo, Oslo, Norway, (4)Universität Bayreuth, Bayerisches Geoinstitut, Bayreuth, Germany
Microstructural and geochemical analysis of rutilated quartzite from the Wildhorse Detachment, Pioneer Mountains, Idaho: Implications for strain and mid-crustal rheology (618975)
Jennifer Margaret Taylor1, William O Nachlas2, Christian Teyssier1, Donna L Whitney1, Rory R McFadden3 and Alex Senjem3, (1)University of Minnesota Twin Cities, Department of Earth and Environmental Sciences, Minneapolis, MN, United States, (2)Syracuse University, Earth Sciences, Syracuse, NY, United States, (3)Gustavus Adolphus College, Saint Peter, United States
