T32C:
Shaping Slow- and Ultraslow-Spreading Seafloor with Faults, Magma, and Fluids

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Session ID#: 31649

Session Description:
Crustal accretion at slow- and ultraslow-spreading ridges is fundamentally different from that at faster spreading ridges, and accounts for vast areas of the Atlantic, Indian and Arctic Oceans. Plate separation in these settings is accommodated by a combination of magmatic and tectonic extension, leading to deformation often dominated by large-offset detachment faults. The resulting seafloor has a diverse range of morphologies including corrugated domes, non-corrugated massifs, back-tilted fault breakaways, and broad smooth hills. Despite recent advances in seafloor observations and modeling techniques, the mechanics of this mode of seafloor spreading remain controversial. We welcome contributions from a broad range of approaches, including geophysical and geological observations, geodynamic modeling, fluid chemistry, seismology, experimental rock mechanics and petrology.
Primary Convener:  Ross E Parnell-Turner, Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California San Diego, La Jolla, United States
Conveners:  Jean-Arthur L Olive, Lamont -Doherty Earth Observatory, Palisades, NY, United States and Muriel Andreani, University Claude Bernard Lyon 1, Villeurbanne, France
Chairs:  Jean-Arthur L Olive, WHOI, Woods Hole, United States, Muriel Andreani, University Claude Bernard Lyon 1, Villeurbanne, France and Ross E Parnell-Turner, Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California San Diego, La Jolla, United States
OSPA Liaison:  Ross E Parnell-Turner, Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California San Diego, La Jolla, United States

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

3017 Hydrothermal systems [MARINE GEOLOGY AND GEOPHYSICS]
3035 Midocean ridge processes [MARINE GEOLOGY AND GEOPHYSICS]
8163 Rheology and friction of fault zones [TECTONOPHYSICS]
8178 Tectonics and magmatism [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Mid Ocean Ridge Processes at Very Low Melt Supply : Submersible Exploration of Smooth Ultramafic Seafloor at the Southwest Indian Ridge, 64 degree E (Invited) (269531)
Mathilde Cannat1, Pierre Agrinier2, Manon Bickert3, Daniele Brunelli4, Cedric Hamelin5, Aurélien Lecoeuvre6, Solveig Lie Onstad7, Marcia Maia8, Mariacristina Prampolini9, Stéphane Rouméjon10, Alberto Vitale Brovarone11, Simon Besançon1 and El-Madani Assaoui1, (1)Institut de Physique du Globe de Paris, Paris, France, (2)Université de Paris, Institut de Physique du Globe de Paris, UMR 7154, Paris, France, (3)Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Paris, France, (4)Woods Hole Oceanographic Institution, Woods Hole, United States, (5)Independant scholar, Bergen, Norway, (6)Université d'Aix Marseille, Mediterranean Institute of Oceanography, UMR CNRS 7294, Marseille, France, (7)University of Bergen, Bergen, Norway, (8)CNRS-Université de Bretagne Occidentale, Laboratoire Géosciences Océan, Institut Universitaire Européen de la Mer, Plouzané, France, (9)CNR Institute for Marine Science, Bologna, Italy, (10)ETH Swiss Federal Institute of Technology Zurich, Institute of Geochemistry and Petrology, Zurich, Switzerland, (11)Sorbonne Université, Paris, France
Sulfide geochronlogy along the Southwest Indian Ridge (299662)
Weifang Yang1, Chunhui Tao2, Huaiming Li2, Jin Liang3 and Liao Shili VI3, (1)Key Laboratory of Submarine Geosciences,Second Institute of Oceangraphy, State Oceanographic Administration, Hangzhou, China, (2)Key Laboratory of Submarine Geosciences,Second Institute of Oceanography, State Oceanographic Administration, Hangzhou, China, (3)Key Laboratory of Submarine Geosciences, Second Institute of Oceangraphy, State Oceanographic Administration, Hangzhou, China
Weak Serpentine-bearing Fault Zones: laboratory evidence and implications for the activity of of oceanic detachments (269039)
Telemaco Tesei, University of Padova, Department of Geoscience, Padova, Italy, Christopher Harbord, University College London, Department of Earth Sciences, London, United Kingdom, Nicola Paola, Durham University, Department of Earth Sciences, Durham, United Kingdom, Cristiano Collettini, Sapienza University of Rome, Rome, Italy and Cecilia Viti, Università degli Studi di Siena, Dipartimento di Scienze Fisiche, della Terra e dell’Ambiente, Siena, Italy
Characterising the range of seismogenic behaviour on detachment faults – the case of 13o20’N, Mid Atlantic Ridge. (250402)
Timothy J Craig, University of Leeds, COMET, School of Earth and Environment, Leeds, United Kingdom and Ross Parnell-Turner, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Particular Oceanic Core Complex evolution in an extremely low melt supply environment (272264)
Clément Vincent1, Marcia Maia2, Anne Briais3, Daniele Brunelli4, Marco Ligi5, Álden Adrião1 and Susanna E Sichel6, (1)IUEM Institut Universitaire Européen de la Mer, UMR UBO-CNRS 6538 Géosciences Océan, Plouzané, France, (2)CNRS-Université de Bretagne Occidentale, Laboratoire Géosciences Océan, Institut Universitaire Européen de la Mer, Plouzané, France, (3)CNRS GET Géosciences Environnement Toulouse, Toulouse, France, (4)Woods Hole Oceanographic Institution, Woods Hole, United States, (5)Consiglio Nazionale delle Ricerche, Bologna, Italy, (6)LAGEMAR UFF, Niteroi, Brazil
Popping Rocks Revealed: Investigations from 14°N on the Mid-Atlantic Ridge (Invited) (273832)
V Dorsey Wanless, Boise State University, Department of Geosciences, Boise, United States, Max Jones, Massachusetts Institute of Technology, Cambridge, MA, United States, Mark D Kurz, WHOI, Department of Marine Chemistry & Geochemistry, Woods Hole, United States, Adam A Soule, WHOI, Narragansett, United States, Daniel J Fornari, Organization Not Listed, Washington, DC, United States, Sylvana Bendana, Central Washington University, Ellensburg, WA, United States and Eric L Mittelstaedt, University of Idaho, Moscow, ID, United States
Seismic imaging of the Kane oceanic core complex using early-arrival full waveform inversion and pre-stack depth migration of multichannel seismic streamer data (246995)
Min Xu1, Juan Pablo Canales2, Xu Zhao3 and Wen Yan3, (1)CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou, China, (2)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (3)South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
The Atlantis Bank Gabbro Massif, SW Indian Ridge: the Largest Know Exposure of the Lower Crust in the Oceans (266236)
Henry J Dick, Woods Hole Oceanographic Institution, Woods Hole, MA, United States, Astri JS Kvassnes, ReStoneAS, Fylingsdalen, Norway, Hajima Kinoshita, JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan, Christopher J MacLeod, Cardiff University, Cardiff, United Kingdom and PaUL T. Robinson, Chinese Academy of Sciences, Institute of Geology, Beijing, China

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