T44A:
Exploring Subduction Initiation Processes and Subduction Zone Dynamics: New Insights from Scientific Drilling, Marine Geophysics, and Ophiolites I


Submit an Abstract to this Session


Session ID#: 56925

Session Description:
Fundamental processes controlling the genesis and recycling of the earth’s crust are linked to the dynamics of subduction initiation, and the evolution of mature subduction zones through time. Constraining such processes requires a combination of multidisciplinary studies, including ocean-drilling expeditions, seafloor geophysical and seismic exploration, field analyses of ophiolites preserved in mountain belts, and modeling.  New data from these areas are advancing knowledge of the pre-existing structure of the plates, the initial stages of subduction initiation and arc inception and finally the development of mature subduction zones and mature arc settings. This interdisciplinary session solicits contributions from recent and past scientific drilling projects (IODP/ICDP), imaging structures and geophysical characteristics of oceanic lithosphere and nascent subduction zones, and recent advances in field, laboratory, and modeling studies constraining subduction processes from inception to arc development.

 

Primary Convener:  Joann M Stock, California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States
Conveners:  Brandon Shuck, University of Texas at Austin, Institute for Geophysics & Department of Geological Sciences, Austin, TX, United States, Anders John McCarthy, University of Bristol, School of Earth Sciences, Bristol, United Kingdom and Marco Maffione, University of Birmingham, School of Geography Earth and Environmental Sciences, Birmingham, B15, United Kingdom
Primary Liaison:  Brandon Shuck, University of Texas at Austin, Institute for Geophysics & Department of Geological Sciences, Austin, TX, United States
Chairs:  Brandon Shuck, University of Texas at Austin, Institute for Geophysics & Department of Geological Sciences, Austin, TX, United States and Anders John McCarthy, University of Lausanne, Lausanne, Switzerland
OSPA Liaison:  Joann M Stock, California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States

Cross-Listed:
  • OS - Ocean Sciences
  • S - Seismology
  • V - Volcanology, Geochemistry and Petrology
Index Terms:

3036 Ocean drilling [MARINE GEOLOGY AND GEOPHYSICS]
3613 Subduction zone processes [MINERALOGY AND PETROLOGY]
7240 Subduction zones [SEISMOLOGY]
8140 Ophiolites [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Rift-inheritance and subduction initiation at magma-poor rifted margins: implications for the formation of Alpine-type orogens (Invited) (386063)
Julie Tugend, Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre de Paris, ISTeP UMR 7193, Paris, France; Total E&P, R&D, Pau, France, Geoffroy Mohn, University of Cergy-Pontoise, Cergy-Pontoise, France, Masini Emmanuel, Total SA, Exploration Production, SCR/R&D, Pau, France and Gianreto Manatschal, Université de Strasbourg, CNRS, ITES UMR 7063, Strasbourg Cedex, France
Do supra-subduction zone ophiolites form by diffuse spreading of the forearc during subduction initiation? A Mariana – Troodos analogy (435012)
Julia Ribeiro1, Julian Anthony Pearce2, Christopher J MacLeod3 and Johan C J Lissenberg3, (1)Guangzhou Institute of geochemistry, Guangzhou, China, (2)Cardiff University, Cardiff, CF24, United Kingdom, (3)Cardiff University, Cardiff, United Kingdom
Early results from SISIE – South Island Subduction Initiation Experiment – in the context of recent drilling and geodynamic models (Invited) (381471)
Michael Gurnis, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States, Harm J Van Avendonk, University of Texas at Austin, Institute for Geophysics, Austin, TX, United States, Sean P S Gulick, University of Texas, Institute for Geophysics, Austin, United States, Joann M Stock, California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States, Rupert Sutherland, Victoria University of Wellington, Wellington, New Zealand, Erin Hightower, Jet Propulsion Laboratory, Pasadena, United States, Brandon Shuck, University of Texas at Austin, Institute for Geophysics & Department of Geological Sciences, Austin, TX, United States, Jiten Patel, Victoria University Wellington, School of Geography, Environment and Earth Sciences, Wellington, New Zealand and SISIE Shipboard Science Party
The Snares Zone and Puysegur Trench: 4D Oblique Subduction and Strike-slip Tectonics (449563)
Sean P S Gulick, The University of Texas at Austin, UTIG and EPS, Jackson School of Geosciences, Austin, United States, Michael Gurnis, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States, Brandon Shuck, University of Texas at Austin, Institute for Geophysics & Department of Geological Sciences, Austin, TX, United States, Harm J Van Avendonk, University of Texas at Austin, Institute for Geophysics, Austin, TX, United States, Joann M Stock, California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States, Rupert Sutherland, Victoria University of Wellington, Wellington, New Zealand, Erin Hightower, Jet Propulsion Laboratory, Pasadena, United States, Jiten Patel, Victoria University Wellington, School of Geography, Environment and Earth Sciences, Wellington, New Zealand and SISIE Shipboard Science Party
Drilling Reveals Continental-scale Impacts of Eocene Tonga-Kermadec Subduction Initiation (390129)
Rupert Sutherland, Victoria University of Wellington, Wellington, New Zealand, Gerald R Dickens, Rice Univ, Houston, TX, United States, Peter Blum, Texas A&M University, Scientific Ocean Drilling, College Station, United States and IODP Expedition 371 Scientists
An Examination of Upper-Plate Uplift Driven by Subduction Initiation in Haida Gwaii, Canada. (423841)
Philip Schoettle-Greene, University of Washington Seattle Campus, Seattle, United States and Alison R Duvall, University of Washington, Earth and Space Sciences, Seattle, United States
Thermal Softening Induced Strain Localization, a Possible Mechanism of Lithospheric Scale Shear Zone Formation and Subduction Initiation (440493)
Daniel Kiss1, Lorenzo G. Candioti1, Thibault Duretz1,2, Yuri Podladchikov3 and Stefan M Schmalholz1, (1)University of Lausanne, Institute of Earth Sciences, Lausanne, Switzerland, (2)Université de Rennes, Géosciences Rennes, Rennes, France, (3)University of Lausanne, Lausanne, Switzerland

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