T012
Oceanic and Continental Extensional Tectonics

Session ID#: 161624

Session Description:
Our understanding of extensional tectonics from continental breakup to formation of oceanic crust and oceanic basins has improved substantially within the last three decades based on geological, geophysical, geochemical studies, and analog and computer modeling. Although it is widely accepted that continental fragmentation occurred throughout geological times, there are still many fundamental questions related to the transition from continental extensional tectonics in continental crust to an oceanic basin and oceanic crust formation, especially along the passive margins. 

     Large-scale extensional tectonics in the Basins and Ranges of Western North America and the Aegean Region of Eastern Europe and Western Asia occurred after collisional tectonics. These regions experienced a transition in the Cenozoic from contraction to large-scale extension and metamorphic core complex formation. This type of tectonic and petrologic succession may be “normal” for collisional mountain belts due to gravitational collapse of over thickened crust, or extension may be driven by other forcing factors, such as slab roll-back or continental escape.

    This symposium will bring together researchers working on fundamental research questions on oceanic and continental extensional processes and transition from continental to oceanic crust. We plan to identify the most exciting new opportunities to answer the fundamental questions in extensional tectonics.

Index Terms:

8109 Continental tectonics: extensional [TECTONOPHYSICS]

Primary Convener:  Ibrahim Cemen, University of Alabama, Geological Sciences, Tuscaloosa, AL, United States
Convener:  Elizabeth J Catlos, Univeristy of Texas at Austin, Geological Sciences, Austin, TX, United States
 
Metamorphic core complex dichotomy in the North American Cordillera explained by buoyant upwelling in variably thick crust (1052422)
Andrew V Zuza, University of Nevada Reno, Nevada Bureau of Mines and Geology, Reno, United States and Wenrong Cao, University of Nevada Reno, Department of Geological Sciences and Engineering, Reno, United States
 
A Rolling Hinge in an Erosive World: Explaining Low Apparent Dips of Large-Offset Normal Faults (1067981)
W Roger Buck, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States and Jean-Arthur L Olive, Ecole Normale Supérieure Paris/CNRS, Laboratoire de géologie, Paris, France
 
Insights into Continental Rifting and Oceanic Crust Formation from Integrating Data from Passive Margins and Continental Rifts (1073785)
Carol A Stein, University of Illinois Chicago, Department of Earth & Environmental Sciences, Chicago, United States, Seth Stein, Northwestern University, Earth & Planetary Sciences, Evanston, IL, United States, Molly Margaret Gallahue, Northwestern University, Department of Earth & Planetary Sciences, Evanston, IL, United States and Reece Phillip Elling, Northwestern University, Department of Earth and Planetary Sciences, Evanston, IL, United States
 
New Results on the Structure of Iconic Rifted Continental Margins by Revising Legacy Seismic Datasets: The Newfoundland Margin (1081413)
Laura Gomez de la Pena, Barcelona-CSI, ICM-CSIC, Barcelona, Spain, Cesar Ranero, ICREA at CSIC, Barcelona, Spain, Manel Prada, ICM-CSIC, Barcelona-CSI, Geosciences, Barcelona, Spain, Valenti Sallares, Institute of Marine Sciences - CSIC, Barcelona, Spain and Donna J Shillington, Lamont -Doherty Earth Observatory, Palisades, United States
 
Extensional Tectonics from Continental Breakup to Formation of Oceanic Basins: A review (1084465)
Ibrahim Cemen, University of Alabama, Geological Sciences, Tuscaloosa, AL, United States and Elizabeth J Catlos, Univeristy of Texas at Austin, Geological Sciences, Austin, TX, United States
 
Cenozoic remobilization of the Cambro–Ordovician proto-tectonic terrane boundary, South Tibetan Detachment System (STDS) in the NW Himalaya (1101794)
Gargi Deshmukh1, Arvind K. Jain2, Deepak Chandra Srivastava1, Rahul Dixit3, Pulok Kumar Mukherjee4 and Saurabh Singhal5, (1)Indian Institute of Technology Roorkee, Roorkee, India, (2)Council of Scientific & Industrial Research, Central Building Research Institute, Roorkee, India, (3)University of Delhi, Department of Geology, Delhi, India, (4)Inter-University Accelerator Centre, Delhi, India, (5)Wadia Institute of Himalayan Geology, Dehradun, India
 
Extensional Deformation in the Pacific Oceanic Plateaux (1107932)
Erkan Gün1, Russell Pysklywec1, Gültekin Topuz2, Oguz Gogus2 and Philip Heron3, (1)University of Toronto, Department of Earth Sciences, Toronto, ON, Canada, (2)Istanbul Technical University, Eurasia Institute of Earth Sciences, Istanbul, Turkey, (3)University of Toronto, Department of Physical & Environmental Sciences, Toronto, ON, Canada
 
Structural Analysis of Çameli Basin in the context of Fethiye Burdur Shear Zone (FBFZ), SW Anatolia. (1124730)
Ozan Sinoplu1,2, Jiannan Meng2, Timothy M Kusky3 and Erdin Bozkurt4, (1)Auburn University, Department of Geosciences, Auburn, United States, (2)China University of Geosciences Wuhan, School of Earth Sciences, Wuhan, China, (3)China University of Geosciences, Wuhan, State Key Laboratory of Geological Processes and Mineral Resources, and Center for Global Tectonics, School of Earth Sciences, Wuhan, China, (4)Department of Geological Engineering, Middle East Technical University, Ankara, Turkey
 
Seismic Structure and the Variation of Magmatic Budget in the Southwest Sub-basin of the South China Sea (1136958)
Yuhan Li1,2, Jiazheng Zhang1, Yongjian Yao3, Minghui Zhao1, Rongwei Zhu3, LiJie Wang3 and Chenghui Zeng1, (1)South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China, (2)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (3)Guangzhou Marine Geological Survey, Guangzhou, China
 
The Formation of Canada Basin, Arctic Ocean: imaging an extinct spreading ridge (1148065)
David Cole Mosher, Geological Survey of Canada Atlantic, Dartmouth, NS, Canada and Bernard Coakley, Univ Alaska, Fairbanks, AK, United States
 
Tracking the transition from contractional to extensional tectonics in the upper plate of a retreating subduction system: A case study in the Aegean forearc, in the Southern Hellenides, Northern Peloponnese, Greece (1149731)
Vincent Wicker1, Mary Ford2, Rob L Gawthorpe3, Léa Kerouedan4, Haralambos D Kranis5, Emmanuel Skourtsos6, Pierre Bouilhol7, Raphael Pik8, Bouchaïb Tibari9, Marie-Camille Caumon10, Romain Hemelsdael11, Alexis Plunder12, Martin Muravchik13 and Fabregas Natacha3, (1)University of Lorraine, CRPG-CNRS, Nancy Cedex, France, (2)CRPG Centre de Recherches Pétrographiques et Géochimiques, Vandoeuvre-Les-Nancy, France, (3)University of Bergen, Department of Earth Science, Bergen, Norway, (4)University of Lorraine, CRPG-CNRS, Nancy, France, (5)University of Athens, Athens, Greece, (6)National and Kapodistrian University of Athens, Department of Earth Sciences, Athens, Greece, (7)Université de Lorraine, Centre de Recherches Pétrographiques et Géochimiques, Nancy, France, (8)CRPG, Vandoeuvre-lès-Nancy, France, (9)CRPG, UMR 7358 CNRS-UL, Nancy, France, (10)University of Lorraine Nancy, BP70329, Laboratory of GeoResources, Nancy Cedex, France, (11)University of Lorraine Nancy, Nancy Cedex, France, (12)BRGM, Orléans, France, (13)University of Bergen, Department of Earth Sciences, Bergen, Norway
 
Effect of crustal flow on bivergent metamorphic core complex exhumation and detachment faulting in western Anatolia (1152322)
Omer Bodur, University of Texas at Dallas, Geosciences, Richardson, TX, United States, Oguz Gogus, Istanbul Technical University, Eurasia Institute of Earth Sciences, Istanbul, Turkey, Dr. Sascha Brune, GFZ German Research Centre for Geosciences, Potsdam, Germany, Ebru Sengul Uluocak, Canakkale Onsekiz Mart University, Department of Geophysical Engineering, Canakkale, Turkey, Anne Glerum, Deutsches GeoForschungsZentrum GFZ, Potsdam, Germany and Hasan Sözbilir, Dokuz Eylül University, Department of Geological Engineering, Izmir, Switzerland
 
Using Lu-Hf in Detrital Zircon to Follow the Extension of a Back-Arc Basin: an Example from the Jurassic-Cretaceous Rocas Verdes Basin in Southernmost Patagonia (1152675)
Fernando Rey, University of Texas at Austin, Austin, TX, United States and Matthew A Malkowski, University of Texas at Austin, Geological Sciences, Austin, CA, United States
 
A fossil signature of collapsed highlands: the gravitational body forces effect on dynamics and structural development of metamorphic core complexes (1162866)
Alireza Bahadori1, William E Holt2, Jacqueline Austermann1, Troy Rasbury3, Daniel M Davis2, Lajhon Campbell4, Christopher Matthew Calvelage5 and Lucy M Flesch6, (1)Lamont-Doherty Earth Observatory, Columbia University in the City of New York, New York, United States, (2)Stony Brook University, Stony Brook, NY, United States, (3)Stony Brook University, Stony Brook, United States, (4)Stony Brook University, Department of Geosciences, Stony Brook, United States, (5)University of Houston, Department of Earth and Atmospheric Sciences, Houston, United States, (6)Purdue University, West Lafayette, IN, United States
 
An Active Role for the Ocean in Seafloor Spreading (1171092)
James Andrew Conder, Southern Illinois University Carbondale, Geology, Carbondale, IL, United States
 
New Insights into Early Cretaceous Extension in Northern Mongolia (1191365)
Jarret Pidgeon1, Gavin Pirrie1, Laura Elaine Webb1, Justin Tully2, Susana Henriquez2,3 and Gombodorj Batsukh4, (1)University of Vermont, Department of Geography and Geosciences, Burlington, United States, (2)University of Utah, Department of Geology and Geophysics, Salt Lake City, United States, (3)University of Arizona, Tucson, AZ, United States, (4)Mongolian Academy of Sciences, Institute of Geology, Ulaanbaatar, Mongolia
 
Crustal Structure of the East Sub-basin, South China Sea Constrained by OBS Refraction/Reflection Data (1197984)
Zhang Lu, Sun Yat-Sen University, Guangzhou, China, Chen Cai, Sun Yat-sen University, School of Earth Sciences and Engineering, Guangzhou, China and Rui Gao, Sun Yat-Sen University, School of Earth Sciences and Engineering, Guangzhou, China
 
Triassic to Mid-Jurassic Magmatism during Progressive Rifting along the Eastern North American Margin, U.S.A. (1198915)
Zachary Foster-Baril1, Emily Hinshaw2, Daniel F Stockli2 and Christopher Bailey3, (1)University of Texas at Austin, Austin, TX, United States, (2)University of Texas at Austin, Department of Geological Sciences, Austin, TX, United States, (3)College of William and Mary, Geology, Williamsburg, VA, United States
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