DI016
Unusual Subduction Processes
Session ID#: 158999
Session Description:
Subduction drives plate tectonics, releases 90% of global seismic moment, governs the largest element recycling system, and shapes the Earthâs surface. Despite progress in our understanding of subduction zones, important questions remain regarding subduction dynamics, especially in atypical subduction environments (e.g., complex slab geometries, interactions with the overriding plate, variable properties of the incoming subducting plate, and subducting-overriding plate memory). Further progress requires integrating observations from geochemistry, geophysics, field geology, and geodynamic modelling, as well as expanding the range of subduction zone investigations to include atypical examples. Unusual slab morphologies and processes such as slab tearing, lithospheric delamination, STEP fault propagation and anomalous arc volcanism all highlight aspects of unusual subduction dynamics. In this session, we invite contributions from all disciplines, including geodynamics, geophysics, geochemistry, field geology, and mineral physics in a common effort to advance the understanding of subduction processes and dynamics. Session Mentee: Manas Kurup
Co-Organized:
Index Terms:
7240 Subduction zones [SEISMOLOGY]
8104 Continental margins: convergent [TECTONOPHYSICS]
8170 Subduction zone processes [TECTONOPHYSICS]
8413 Subduction zone processes [VOLCANOLOGY]
Primary Convener: Antoniette Greta Grima, University of Texas at Austin, Institute of Geophysics, Austin, United States
Conveners: Caroline Seyler, University of Texas, Austin, Institute for Geophysics, Austin, TX, United States, Antoniette Greta Grima, University of Texas at Austin, Institute of Geophysics, Austin, United States and Ping Zhang, Australian National University, Canberra, ACT, Australia
Student/Early Career Convener: Shubham Agrawal, Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia
Multi-scale, finite-frequency body wave tomography of Southern Patagonia (1047836)
Walid Ben Mansour, Washington University in St Louis, St. Louis, MO, United States, Douglas Wiens, Washington University in St. Louis, St. Louis, MO, United States, Valerie Maupin, University of Oslo, CEED, Oslo, Norway, Hannah Mark, Woods Hole Oceanographic Institution, Woods Hole, United States, Andreas Richter, TU Dresden, Dresden, Germany and Sergio Eduardo Barrientos, Universidad de Chile, Centro Simológical Nacional, Santiago, Chile
Scaling of Free Subduction on a Sphere (1048995)
Neil M Ribe, CNRS, Paris Cedex 16, France; Paris-Saclay University, Laboratoire FAST, Orsay, France, Gianluca Gerardi, PSL Research University, MINES ParisTech, Fontainebleau, France, Alexander Chamolly, Institut Pasteur, Paris, France and Zhong-Hai Li, Chinese Academy Geological Sciences, Beijing, China
Seismic Imaging of Subsurface Structural Variations along the Japan Trench South of the 2011 Tohoku Earthquake Rupture Zone (1055060)
Yanfang Qin1, Yasuyuki Nakamura2, Shuichi Kodaira3 and Gou Fujie2, (1)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan, (2)Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan, (3)Yokohama National University, Yokohama, Japan
Focusing Effects of Teleseismic Wavefields by the Cascadia Slab: Evidence for Slab Continuity (1056059)
Guanning Pang, Cornell University, Ithaca, NY, United States, Geoffrey A Abers, Cornell University, Ithaca, United States and Peter E van Keken, Carnegie Institution for Science, Earth and Planets Laboratory, Washington, DC, United States
Elastic Anomalies across the α-β Phase Transition in Orthopyroxene: Implication for the Metastable Wedge in the Cold Subduction Slab (1060593)
Li Luo1, Ningyu Sun1, Weigang Shi1, Zhu Mao2, Yingxin Yu1, Yanyao Zhang3 and Jung-Fu Lin4, (1)University of Science and Technology of China, Hefei, China, (2)University Science & Technology of China, Hefei, Anhui, China, (3)The University of Texas at Austin, Department of Geological Sciences, Jackson School of Geosciences, Austin, TX, United States, (4)The University of Texas, Austin, Department of Geological Sciences, Jackson School of Geosciences, Austin, TX, United States
Origin and Evolution of Flat Slab Subduction: Insights From Numerical Modeling of Thermo-Mechanical Behavior (1064808)
Ji-Ching Chen, National Taiwan University, Taipei, Taiwan, Eh Tan, Academia Sinica, Taipei, Taiwan and Shu-Huei Hung, Natl Taiwan Univ, Taipei, Taiwan
Thermal effects of flat-slab subduction on the overlying continent: Insights from numerical modeling (Invited) (1069133)
Xiaowen Liu, University of Alberta, Edmonton, AB, Canada; University of Toronto, Department of Earth Sciences, Toronto, ON, Canada, Claire A Currie, University of Alberta, Department of Physics, Edmonton, AB, Canada and Lara S Wagner, UNC-Chapel Hill, Chapel Hill, United States
Can the downdip extent of subducted aseismic ridges under the Andean margin be mapped from published P-wave tomography? (1073885)
Oriyomi Ojelabi1, Jonny Wu1 and Yi-Wei Chen2, (1)University of Houston, Department of Earth and Atmospheric Sciences, Houston, United States, (2)University of Houston, Department of Earth and Atmospheric Sciences, Houston, TX, United States
Slab-Plume Interactions across North/Central America Revealed by Adjoint Tomography (1076523)
Junlin Hua, University of Texas at Austin, Department of Geological Sciences, Austin, TX, United States, Stephen P Grand, University of Texas at Austin, Jackson School of Geosciences, Austin, TX, United States, Chujie Liu, University of Texas at Austin, Department of Geological Sciences, Austin, United States, Helen A Janiszewski, University of Hawai`i at Mānoa, Department of Earth Sciences, Honolulu, United States and Daniel T Trugman, University of Nevada Reno, Nevada Seismological Laboratory, Reno, United States; University of Texas at Austin, Jackson School of Geosciences, Austin, United States
Slab segmentation, tearing, and the development of anomalous arc magmatism (1082813)
Gideon Rosenbaum, University of Queensland, St Lucia, QLD, Australia, John Caulfield, Queensland University of Technology, Brisbane, Australia, Teresa Ubide Garralda, University of Queensland, Brisbane, Australia, Jack Ward, University of Queensland, Brisbane, QLD, Australia, Dan Sandiford, Monash University, Clayton, VIC, Australia and Mike Sandiford, University of Melbourne, Parkville, Australia
Constraints on the protolith accumulation and metamorphic age of the lowest unit (Oboke unit) of deeply subducted accretion complex -Case study of the Cretaceous high P/T metamorphic rocks (Sanbagawa metamorphic rocks), Japan- (1083790)
Kazuaki Okamoto, Saitama University, Saitama, Japan, Yukari Otsuka, Kawagoe-MInami high school, Kawagoe, Japan and Kazumasa Aoki, Okayama University of Science, Okayama, Japan
Reanalyzing Existing Seismic Observations to Image the Pampean Flat Slab Region (1087298)
Steven W Roecker1, Ariane Maharaj2, Andrea Paz Navarro-Aránguiz3, Agostina Lía Venerdini4, Mauro Saez5, Diana Comte6 and Sol Trad5, (1)Rensselaer Polytechnic Inst, Earth & Environmental Sciences, Troy, NY, United States, (2)Rensselaer Polytechnic Institute, Earth and Environmental Sciences, Troy, NY, United States, (3)Universidad de Chile, Departamento de Geofísica, Santiago, Chile, (4)CIGEOBIO (CONICET - FCEFN, Universidad Nacional de San Juan), Departamento de Geofísica y Astronomía, FCEFN, UNSJ, San Juan, Argentina, (5)Universidad Nacional de San Juan, Departamento de Geofísica y Astronomía, San Juan, Argentina, (6)University of Chile, Santiago, Chile
The Geodynamic Evolution of the Subducting Chile Ridge, thermal and geodynamic consequences constrained by geophysical and geological data. (1105967)
Jorge Sanhueza1, Gonzalo A Yanez1, Roger Buck2, Jaime Araya3 and Eugenio E Veloso4, (1)Pontifical Catholic University of Chile, Deparment of Structural and Geotechnical Engineering, Santiago, Chile, (2)Columbia University of New York, Lamont-Doherty Earth Observatory, Palisades, NY, United States, (3)Universidad de Atacama, Geology department, Copiapo, Chile, (4)Pontifical Catholic University of Valparaíso, School of Ocean Sciences, Valparaíso, Chile
A New Plate Tectonic Reconstruction for Western North America, 40 Ma to Present (1119565)
Neta Bar, Yale University, New Haven, CT, United States and Mark T Brandon, Yale University, Earth and Planetary Sciences, New Haven, CT, United States
A 3-D numerical investigation of the impact of aseismic ridges on subduction dynamics and stress (1126740)
Lior Suchoy1, Saskia D B Goes1, Fangqin Chen2 and Rhodri Davies2, (1)Imperial College London, Department of Earth Science and Engineering, London, United Kingdom, (2)Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia
Unravelling an enigmatic boundary along the Sunda-Banda volcanic arc (1134051)
Ping Zhang1, Meghan Samanth Miller1 and Caroline M Eakin2, (1)Australian National University, Canberra, ACT, Australia, (2)Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia
Progressive flat-slab coupling as a driving mechanism for the Laramide orogeny (1134193)
Noah Hobbs, New Mexico Institute of Mining and Technology, Socorro, NM, United States, Jolante van Wijk, Los Alamos National Laboratory, Los Alamos, United States and Gary J Axen, New Mexico Institute of Mining and Technology, Earth and Environmental Science, Socorro, NM, United States
Forced Cenozoic Continental Subduction of Tarim Craton-like Lithosphere below the Tianshan in the Framework of Indian-Eurasian Collision (1134633)
Weijia Sun1, Qingya Tang1, Songjian Ao1, Marco Giovanni Malusa'2, Liang Zhao1 and Wenjiao Xiao3, (1)Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China, (2)University of Milano-Bicocca, Milano, Italy, (3)Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China
The Crust and Upper mantle structure beneath Bangladesh: understanding the Indo-Burma subduction. (1140665)
Ritima Das, Pondicherry University, Pondicherry, India, Utpal Saikia, Indian Institute of Science Education and Research Pune, Earth and Climate Science, Pune, India and Gokul Kumar Saha, National Geophysical Research Institute, Hyderabad, India
Numerically Modelling Along-strike Rheologic Variations in 3D Subduction Zones (1146033)
Derek J Neuharth1, Whitney M Behr1 and Adam Holt2, (1)ETH Zurich, Structural Geology and Tectonics Group, Geological Institute, Zurich, Switzerland, (2)University of Miami, Rosenstiel School of Marine, Atmospheric, and Earth Science, Miami, United States
What Controls Lateral Segmentation in Cascadia? Sub-Slab Density Anomalies or Slab Age Variations (1146234)
Vincent Sassard1,2, Ylona van Dinther3, Miles Bodmer4, Emilie E E Hooft5 and Douglas R Toomey5, (1)Purdue University, Earth, Atmospheric, and Planetary Sciences, West Lafayette, IN, United States, (2)Utrecht University, Faculty of Geosciences, Utrecht, Netherlands, (3)Utrecht University, Utrecht, Netherlands, (4)Sandia National Laboratories, Albuquerque, United States, (5)University of Oregon, Department of Earth Sciences, Eugene, OR, United States
Anisotropy of the Mantle Lid of the Subducting Juan de Fuca Plate (Cascadia) Inferred from Receiver Functions: A Proxy for Slab Hydration? (1155676)
Wasja Bloch1, Michael G Bostock1, Pascal Audet2 and Sarah Brownlee3, (1)University of British Columbia, Vancouver, BC, Canada, (2)University of Ottawa, Department of Earth and Environmental Sciences, Ottawa, ON, Canada, (3)Wayne State University, Detroit, United States
The North Borneo Puzzle: Detailed seismic imaging of a complex post-subduction tectonic setting (1163892)
Nicholas Rawlinson1, Simone Pilia2,3, Amy Gilligan4, Harry Telajan Linang2, Tim Greenfield5, David G Cornwell4, Felix Tongkul6, Deborah Wehner2, Conor Andrew Bacon7 and Joe Fone8, (1)University of Cambridge, Bullard Labs, Department of Earth Sciences, Cambridge, United Kingdom, (2)University of Cambridge, Cambridge, United Kingdom, (3)University Di Milano, Department of Earth and Environmental Sciences, Milan, Italy, (4)University of Aberdeen, Aberdeen, United Kingdom, (5)Bullard Laboratories, Cambridge, United Kingdom, (6)Univ Malaysia Sabah, Kota Kinabalu, Malaysia, (7)Bullard Laboratories, Department of Earth Sciences, Cambridge, United Kingdom, (8)Bullard Laboratories, Bullard Labs, Department of Earth Sciences, Cambridge, United Kingdom
A Multidisciplinary Investigation of the Seismic Expression and Tectonomagmatic Evolution of Subduction Termination (Invited) (1172262)
Jonathan R Delph, Purdue University, Earth, Atmospheric, and Planetary Sciences, West Lafayette, IN, United States, Mary R Reid, Northern Arizona Univ, Flagstaff, AZ, United States, Daniel Evan Portner, Arizona State University, School of Earth and Space Exploration, Tempe, United States, W. Kirk Schleiffarth, Sibanye-Stillwater, Red Lodge, United States, Susan L Beck, University of Arizona, Tucson, United States, Colton Lynner, University of Delaware, Earth Sciences, Newark, United States and Eric A Sandvol, University of Missouri, Department of Geological Sciences, Columbia, MO, United States
Unraveling links between upper mantle pressure, flow, and dynamic topography using global subduction models (1181087)
Adam Holt, University of Miami, Rosenstiel School of Marine, Atmospheric, and Earth Science, Miami, United States and Samuel Lukens Lukens Goldberg, University of Miami, Rosenstiel School of Marine, Atmospheric, and Earth Science, Miami, United States
Three Dimensional S-wave Velocity and Discontinuity Structure of the Caucasus (1184356)
Utku Kocum, University of Missouri Columbia, Columbia, MO, United States, Gurban Yetirmishli, Azerbaijan National Academy of Sciences, Department of Earth Sciences, Baku, Azerbaijan, Tea Godoladze, Institute of Earth Sciences, Ilia State University, Tbilisi, Georgia, Hektor Babayan, Institute of Geological Sciences, National Academy of Sciences of the Republic of Armenia, Yerevan, Armenia, Alexey Malovichko, Federal Research Center United Geophysical Survey of the Russian Academy of Sciences, Obninsk, Russia, John Nabelek, Oregon State University, CEOAS, Corvallis, OR, United States, Kevin G Mackey, Michigan State University, Department of Earth and Atmospheric Sciences, Lansing, MI, United States, Jonathan R Delph, Purdue University, Earth, Atmospheric, and Planetary Sciences, West Lafayette, IN, United States and Eric A Sandvol, University of Missouri, Department of Geological Sciences, Columbia, MO, United States
Seismic Tomography in the Chilean Pampean Flat-Slab Segment: Latitudinal Differences in the Double Seismic Zone and their Relationship with Low Coupling Zones (1194803)
Andrea Paz Navarro-Aránguiz1,2, Diana Comte1,3, Maria Pia Rodriguez4, Steven W Roecker5, Daniela Teresa Calle Gardella1, Valentina Reyes-Wagner1, Marcelo Farías2 and Andreas Rietbrock6, (1)AMTC-FCFM Universidad de Chile, Santiago, Chile, (2)Universidad de Chile, Departamento de Geología, Santiago, Chile, (3)Universidad de Chile, Departamento de Geofísica, Santiago, Chile, (4)Universidad de Atacama, Departamento de Geología, Copiapó, Chile, (5)Rensselaer Polytechnic Inst, Earth & Environmental Sciences, Troy, NY, United States, (6)Karlsruhe Institute of Technology, Karlsruhe, Germany
