T002
A debate on the spectrum of rift systems and the nature of the transition to stable seafloor spreading
Session ID#: 81143
Session Description:
A growing body of observations support that rifting of continental lithosphere occurs by an interplay between magmatic and extensional processes in manners not compatible with the traditional magma-poor vs magma-rich (volcanic vs non-volcanic) models prevalent in the literature of the last 2 decades. Increasing spatial resolution of geophysical observations and improved 2D and 3D numerical capabilities support a new view of the systems and call for a discussion. Furthermore, a renewed effort to re-evaluate the rift system structure preserved in moderately deformed mountain belts has brought a complementary higher-resolution view of some potential examples of ancient systems, although their actual nature is still under discussion. We encourage contributions from field and laboratory work, that include geophysical, geological, and numerical and analog experiments characterising and discussing the 3D/4D evolution from rift systems of distributed deformation to rift localisation and their evolution into stable seafloor-spreading plate boundaries.
Co-Organized:
Index Terms:
8105 Continental margins: divergent [TECTONOPHYSICS]
8106 Continental margins: transform [TECTONOPHYSICS]
8159 Rheology: crust and lithosphere [TECTONOPHYSICS]
8178 Tectonics and magmatism [TECTONOPHYSICS]
Primary Convener: Cesar R Ranero, ICM-CSIC, Barcelona Center for Subsurface Imaging, ICREA at CSIC, Instituto de Ciencias del Mar, Barcelona, Spain, Barcelona, Spain
Conveners: Marta Neres, Instituto Portugues do Mar e da Atmosfera, Lisbon, Portugal, Marta Perez-Gussinye, MARUM– Center for Marine Environmental Sciences, Bremen, Germany and Jason Phipps Morgan, Royal Holloway University of London, Egham, United Kingdom
Primary Liaison: Marta Neres, Instituto Portugues do Mar e da Atmosfera, Lisbon, Portugal
Active Fault System across the Oceanic Lithosphere of the Mozambique Channel: Implications for the Southern Part of the East African Rift System (492907)
Eric Deville1, Tania Marsset2, Simon Courgeon3, Romain Jatiault4, Jean-Pierre Ponte5, Estelle Théréau3, Gwenael Jouet3, Stephan Jorry3 and Laurence Droz6, (1)IFP Energies nouvelles, Rueil-Malmaison Cedex, France, (2)IFREMER, Geosciences Marines, EDROME, Plouzané, France, (3)IFREMER, Plouzané, France, (4)TOTAL - Centre Scientifique et Technique Jean Feger, Pau, France, (5)Univ Rennes, Rennes, France, (6)CNRS, Brest, France
New Constraints on Along-Strike Variations in Synrift Magmatism on the Rifted Margin Offshore North Carolina and Virginia from Seismic Refraction Data (495076)
Jiahua Zhao, Southern University of Science and Technology, Ocean Science and Engineering, Shenzhen, China, Donna J Shillington, Lamont -Doherty Earth Observatory, Palisades, NY, United States, Collin Brandl, University of New Mexico Main Campus, Earth and Planetary Science, Albuquerque, NM, United States and Lindsay Lowe Worthington, University of New Mexico, Albuquerque, NM, United States
A New Type of Crust Marks the Continent-Ocean Transition in the Northern Gulf of California and Salton Trough (497954)
Jolante van Wijk, New Mexico Institute of Mining and Technology, Earth and Environmental Science, Socorro, NM, United States, Gary J Axen, New Mexico Institute of Mining and Technology, Socorro, NM, United States and Patricia Persaud, California Institute of Technology, Pasadena, CA, United States; Louisiana State University, Department of Geology and Geophysics, Baton Rouge, LA, United States
Two distinct phases of rifting revealed from the deep structure of the Demerara plateau (514706)
Thomas Museur1, David Graindorge2, Frauke Klingelhoefer1, Walter R Roest3, Christophe Basile4, Lies Loncke5 and Francois Sapin6, (1)IFREMER, Plouzané, France, (2)UMR LGO, Bretagne University, Brest, France, (3)Ifremer Centre Brest, Plouzane, France, (4)ISTerre Institute of Earth Sciences, Saint Martin d'Hères, France, (5)CEFREM Centre de Formation et de Recherche sur les Environnements Méditerranéens, Perpignan Cedex, France, (6)Total, Pau, France
Nature of Transitional Crust in Northern Margin of the South China Sea (516039)
Aqeel Abbas1, Chun-Feng Li1, Xiaoli Wan2, Zhen Sun3, Wenai Hou1 and Akinrinade Opeyemi1, (1)Zhejiang University, Department of Marine Sciences, Zhoushan, China, (2)Tongji University, Shanghai, China, (3)South China Sea Inst of Oceano, Guangzhou, China
Imaging the Deep Galicia margin using three-dimensional full waveform inversion (517463)
Bhargav Boddupalli, University of Southampton, Southampton, SO14, United Kingdom, Timothy A Minshull, University of Southampton, Ocean and Earth Science, Southampton, United Kingdom, Joanna V Morgan, Imperial College London, Department of Earth Science and Engineering, London, United Kingdom and Gaye Bayrakci, University of Southampton, Ocean and Earth Science, Southampton, SO14, United Kingdom
Multi-scale along-margin variations in breakup volcanism at the Eastern North American Margin identified by magnetic anomaly modeling (527194)
John Anthony Greene, Texas A&M University College Station, College Station, TX, United States, Masako Tominaga, Woods Hole Oceanographic Institution, Woods Hole, MA, United States and Nathaniel C Miller, USGS Coastal and Marine Science Center Woods Hole, Woods Hole, MA, United States
The seismic structure of the West Iberian continent-ocean transition (585515)
Valenti Sallares, Institute of Marine Sciences-CSIC, Barcelona, Spain, Irene Merino, Barcelona Center for Subsurface Imaging, CSIC, ICM, Barcelona, Spain, Manel Prada, ICM-CSIC, Barcelona-CSI, Geosciences, Barcelona, Spain, Cesar R Ranero, ICREA at Institute of Marine Sciences-CSIC, Barcelona, Spain, Ingo Grevemeyer, GEOMAR, Kiel, Germany, Alcinoe Calahorrano, Institute of Marine Science -CSIC, Barcelona, Spain, Alejandra L. Cameselle, University of Vigo, Vigo, Spain and Marta Neres, Instituto Portugues do Mar e da Atmosfera, Lisbon, Portugal
The Crustal Structure of the Continent-ocean Transition along the Gulf of Lions from Travel-Time Tomography of MCS and WAS Data (588586)
Irene Merino, Barcelona Center for Subsurface Imaging, CSIC, ICM, Barcelona, Spain, Manel Prada, ICM-CSIC, Barcelona-CSI, Geosciences, Barcelona, Spain, Cesar R Ranero, ICREA at Institute of Marine Sciences-CSIC, Barcelona, Spain, Valenti Sallares, Institute of Marine Sciences - CSIC, Barcelona, Spain, Daniel Aslanian, IFREMER, Plouzané, France and Schnurle Philippe, Ifremer, Plouzané, France
