T006
Subduction Initiation at the Turning Point of the Wilson Cycle

Session ID#: 160219

Session Description:
At the onset of convergent tectonics in the Wilson Cycle, subduction initiation represents a fundamental geological process governing the Earth´s dynamics. Geodynamic modelling, geophysical techniques, field observations, and geochemical studies have addressed the role of inherited lithospheric discontinuities and physical properties and the record and timescales of magmatism during subduction inception. The subsequent orogenic overprint and the scarcity of fossil examples challenge the characterization of the transient initiation process and nascent subduction zones.

This session aims to attract works that approach the spectrum of contraction processes during the first phases of the convergent cycle, from compressional reactivation of oceanic domains, rifted margins and rift systems, to subduction initiation. We invite contributions that address the structure of the deforming region, its spatio-temporal geodynamic evolution, and the role of pre-existing lithospheric structures and physical properties, using geophysical data, numerical and analogue modelling, field observations, geochemical, petrological and thermochronological approaches, and plate reconstructions.

Index Terms:

3040 Plate tectonics [MARINE GEOLOGY AND GEOPHYSICS]
3060 Subduction zone processes [MARINE GEOLOGY AND GEOPHYSICS]
8011 Kinematics of crustal and mantle deformation [STRUCTURAL GEOLOGY]
8104 Continental margins: convergent [TECTONOPHYSICS]

Primary Convener:  Patricia Cadenas, Memorial University of Newfoundland, Earth Sciences, St John's, Canada; Faculdade de Ciências Universidade de Lisboa, Instituto Dom Luiz, Lisboa, Portugal
Conveners:  Brandon Shuck, Lamont -Doherty Earth Observatory, Palisades, TX, United States, Cesar Ranero, ICREA at CSIC, Barcelona, Spain and Taras Gerya, Geophysical Fluid Dynamics, Institute of Geophysics, ETH Zurich, Zurich, Switzerland
Student/Early Career Convener:  Brandon Shuck, University of Texas at Austin, Institute for Geophysics & Department of Geological Sciences, Austin, TX, United States
 
Subduction Initiation Induced by Super-Dense Sediment Loading on Precambrian Earth (1058858)
Xin Zhou, University of Minnesota Twin Cities, Department of Earth Sciences, Minneapolis, MN, United States and Ikuko Wada, Department of Earth Sciences, Minneapolis, United States
 
Timescales of Subduction Initiation and Evolution of Thermal Regimes (the Oman Metamorphic Sole Record) (1085894)
Mathieu Soret, Université d'Orléans, Orléans, France, Guillaume Bonnet, Sorbonne Université, Institut des Sciences de la Terre de Paris, Paris, France, Philippe Agard, University Pierre and Marie Curie Paris VI, ISTeP, Paris, France, Kyle Larson, University of British Columbia, Department of Earth, Environmental and Geographic Sciences, Kelowna, BC, Canada, John M Cottle, University of California Santa Barbara, Santa Barbara, CA, United States, Benoît Dubacq, ISTeP Institut des Sciences de la Terre de Paris, Sorbonne Université, Paris Cedex 05, France, Mark Button, Fipke Laboratory for Trace Element Research, Kelowna, BC, Canada and Nicolas Rividi, Service Camparis - Sorbonne Universite, Paris, France
 
Subduction Initiation at a Fracture Zone in the Atlantic Ocean? A New Active Source Seismic Study of the Barracuda Ridge. (1085971)
Lianjun Li1, Jenny Collier1, Timothy Henstock2 and Saskia D B Goes1, (1)Imperial College London, Department of Earth Science and Engineering, London, United Kingdom, (2)University of Southampton, National Oceanography Centre, Southampton, United Kingdom
 
Continental Lithosphere Delamination Triggers Subduction Initiation (1095297)
Zebin Cao, University of Illinois at Urbana Champaign, Geology, Urbana, IL, United States and Lijun Liu, University of Illinois at Urbana-Champaign, Geology, Urbana, United States
 
Elastic properties of thermally treated diabase and peridotite: Implications towards the elastic thickness and flexural rigidity of the trench outer rise systems (1098153)
Eranga Jayawickrama, Hiroshima University, Higashi-Hiroshima, Japan and Ikuo Katayama, Hiroshima Univ, Hiroshima, Japan
 
Conditions for Subduction Initiation Inferred from Analysis of Successful and Unsuccessful Cenozoic Attempts (Invited) (1102716)
Serge Lallemand, Géosciences Montpellier, Montpellier University, CNRS, Montpellier, France and Diane Arcay, UMR5243 Geosciences Montpellier, CNRS, Montpellier, France
 
Structural Inversion of Rotational and Oblique Rifts: Inferences from 3D Coupled Thermo-Mechanical and Surface Processes Models (1139027)
Eva Oravecz1, Attila Balazs2, Taras Gerya2, Dave May3 and Laszlo Fodor1, (1)Eotvos Lorand University, Budapest, Hungary, (2)Geophysical Fluid Dynamics, Institute of Geophysics, ETH Zurich, Zurich, Switzerland, (3)Scripps Institution of Oceanography, La Jolla, CA, United States
 
Subduction initiation and propagation in the Sulu and Celebes seas (SE Asia) (1154168)
Cesar R Ranero, ICREA at Institute of Marine Sciences-CSIC, Barcelona, Spain and Patricia Cadenas, Memorial University of Newfoundland, Earth Sciences, St John's, Canada
 
Rheological controls on lithospheric deformation at Japan Trench subduction zone and their implications for dynamic origin of plate tectonics (1161912)
Shunjie Han, University of Colorado at Boulder, Physics, Boulder, CO, United States, Shijie Zhong, University of Colorado at Boulder, Department of Physics, Boulder, CO, United States and Kelin Wang, Pacific Geoscience Centre, Geological Survey of Canada, Sidney, BC, Canada
 
Dynamics on Subduction Initiation: From Theory to a Case Study of Puysegur Subduction (1164920)
Yida Li, California Institute of Technology, Pasadena, CA, United States and Michael Gurnis, California Institute of Technology, Pasadena, United States
 
Subduction initiation: From the observational record to earth dynamics (Invited) (1165170)
Michael Gurnis1, Yida Li1 and Jiashun Hu2, (1)California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States, (2)Southern University of Science and Technology, Department of Earth and Space Sciences, Shenzhen, China
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