T33A:
Accretion Modes, Structure, and Processes at Slow- and Ultra-slow Spreading Mid-Ocean Ridges II Posters

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Session ID#: 13405

Session Description:
Slow- and ultra-slow mid-ocean ridges such as the Mid-Atlantic and Southwest Indian often function differently from fast spreading ones. Several modes of lithospheric accretion operate, ranging from magmatic to amagmatic. Here deformation can localize forming oceanic detachment faults, resulting in asymmetric accretion with complex interactions between magmatic, tectonic and hydrothermal processes along the plate boundary. Lithospheric structure and composition are thus extremely variable along such ridges, ranging from the ’classical’ layered model to a peridotite-dominated lithosphere with variable amounts of gabbro.  We seek contributions from recent experiments over a broad range of topics and approaches, including seismicity, seismic reflection and refraction, near-seafloor high-resolution geophysical surveys, geological observations, drilling, geochemistry, fluid chemistry, and modelling. We aim to facilitate discussions, connections and collaborations among these diverse groups and methodologies, so as to understand the controls on different modes of accretion and their consequences for the formation and evolution of oceanic lithosphere.
Primary Convener:  Eric L Mittelstaedt, University of Idaho, Moscow, ID, United States
Conveners:  Roger C Searle, University of Durham, Durham, United Kingdom, Javier Escartin, Institut de Physique du Globe, Paris, France and Muriel Andreani, University Claude Bernard Lyon 1, Villeurbanne, France
Chairs:  Javier Escartin, Institut de Physique du Globe, Paris, France and Muriel Andreani, University Claude Bernard Lyon 1, Villeurbanne, France
OSPA Liaison:  Eric L Mittelstaedt, University of Idaho, Moscow, ID, United States
Co-Organized with:
Volcanology, Geochemistry and Petrology, and Volcanology, Geochemistry and Petrology

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

Proposed Co-Organized Session with:
  • V - Volcanology, Geochemistry and Petrology
Index Terms:

7245 Mid-ocean ridges [SEISMOLOGY]
8118 Dynamics and mechanics of faulting [TECTONOPHYSICS]
8163 Rheology and friction of fault zones [TECTONOPHYSICS]
8416 Mid-oceanic ridge processes [VOLCANOLOGY]

Abstracts Submitted to this Session:

Contrasting Modes of Detachment Faulting at Slower-Spreading Mid-Ocean Ridges (126855)
Christopher J MacLeod, Cardiff University, School of Earth and Environmental Sciences, Cardiff, United Kingdom, Jeremy R Deans, University of Southern Mississippi, School of Biological, Environmental, and Earth Sciences, Hattiesburg, United States, Antony Morris, University of Plymouth, School of Geography, Earth and Environmental Sciences, Plymouth, United Kingdom, Aled Evans, Cardiff University, School of Earth & Ocean Sciences, Cardiff, United Kingdom, Michael J Cheadle, University of Wyoming, Geology & Geophysics, Laramie, United States, Carlotta Ferrando, Géosciences Montpellier, Montpellier Cedex 05, France, Oliver Pluemper, Utrecht University, Utrecht, Netherlands, Gustavo Viegas, Plymouth University, School of Geography, Earth and Environmental Sciences, Plymouth, United Kingdom, Benoit Ildefonse, University of Montpellier II, Montpellier Cedex 05, France, Henry J Dick, Woods Hole Oceanographic Institution, Woods Hole, MA, United States and IODP Expedition 360 Scientists, Texas A&M University College Station, College Station, TX, United States
Major and trace element and isotopic constraints on magma systematics in lavas from the Mid-Cayman Spreading Center (149378)
Marion L Lytle, Boise State University, Dept. of Geosciences, Boise, ID, United States, V. Dorsey Wanless, Boise State University, Department of Geosciences, Boise, United States and Darin M Schwartz, Boise State University, Department of Geosciences, Boise, ID, United States
Microseismicity reveals extreme types oceanic lithosphere, deep reaching fluid circulation and active diking at the Southwest Indian Ridge (133801)
Florian Schmid and Vera S N Schlindwein, Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Bremerhaven, Germany
Un-roofing of mantle at the ultra-slow Mid-Cayman Spreading Centre, Caribbean Sea: constraints from wide-angle data and Vp/Vs ratios (163964)
Ingo Grevemeyer1, Michaela Merz1, Anke Dannowski1, Cord A Papenberg1, Harm J Van Avendonk2, Nicholas W Hayman3 and Christine Peirce4, (1)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (2)University of Texas at Austin, Institute for Geophysics, Austin, TX, United States, (3)Institute for Geophysics, Austin, TX, United States, (4)University of Durham, Durham, United Kingdom
Effect of melt/mantle interactions on MORB chemistry at the eastermost Southwest Indian Ridge (61 to 67°E) (147245)
Marine Paquet1, Mathilde Cannat1, Daniele Brunelli2, Cedric Hamelin3 and Eric Humler4, (1)Institut de Physique du Globe de Paris, Paris, France, (2)Woods Hole Oceanographic Institution, Woods Hole, United States, (3)Independant scholar, Bergen, Norway, (4)Université de Nantes, Laboratoire de Planétologie et Géodynamique, Nantes, France
Velocity structure of the crust at 13˚N on the Mid-Atlantic Ridge: implications for crustal accretion and oceanic core complex formation (138400)
Nuno Mendes Simao1, Christine Peirce1, Matthew Falder2, Timothy J Reston3, Christopher J MacLeod4 and Roger C Searle1, (1)University of Durham, Department of Earth Sciences, Durham, United Kingdom, (2)University of Birmingham, School of Geography, Earth and Environmental Sciences, Birmingham, B15, United Kingdom, (3)University of Birmingham, School of Geography, Earth and Environmental Sciences, Birmingham, United Kingdom, (4)Cardiff University, School of Earth and Environmental Sciences, Cardiff, United Kingdom
Detachment Fault Behavior Revealed by Micro-Seismicity at 13°N, Mid-Atlantic Ridge (150862)
Ross E Parnell-Turner1, Robert A Sohn2, Christopher J MacLeod3, Christine Peirce4, Timothy J Reston5 and Roger C Searle4, (1)Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California San Diego, La Jolla, United States, (2)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (3)Cardiff University, School of Earth and Environmental Sciences, Cardiff, United Kingdom, (4)University of Durham, Durham, United Kingdom, (5)University of Birmingham, Birmingham, United Kingdom
Near-Bottom High Resolution Magnetic Observations Over and Around an Active Oceanic Core Complex, MAR 13°N (147365)
Roger C Searle1, Masako Tominaga2, Christine Peirce1, Timothy J Reston3, Christopher J MacLeod4 and JC132 Shipboard Scientific Party, (1)University of Durham, Durham, United Kingdom, (2)Texas A&M University College Station, College Station, TX, United States, (3)University of Birmingham, Birmingham, United Kingdom, (4)Cardiff University, School of Earth and Environmental Sciences, Cardiff, United Kingdom
Seismic Reflection Imaging of Detachment Faulting at 13˚N on the Mid-Atlantic Ridge (158491)
Matthew Falder1, Reston J Tim1, Christine Peirce2, Nuno Simão2, Christopher J MacLeod3 and Roger C Searle2, (1)University of Birmingham, Birmingham, B15, United Kingdom, (2)University of Durham, Durham, United Kingdom, (3)Cardiff University, School of Earth and Environmental Sciences, Cardiff, United Kingdom
Hydrothermal circulation along oceanic detachment fault: Constraints on the nature and conditions of syntectonic silicification at the 13°20’N oceanic core complex (Mid-Atlantic ridge) (161438)
Diane Bonnemains1, Anne Verlaguet2, Javier Escartin3, Catherine Mevel1 and Muriel Andreani4, (1)Institut de Physique du Globe de Paris, Paris, France, (2)Organization Not Listed, Washington, DC, United States, (3)Institut de Physique du Globe, Paris, France, (4)University Claude Bernard Lyon 1, Villeurbanne, France
Anomalous differentiation pattern of chalcophile metals in the Kane Megamullion MORBs (133759)
Jakub Ciążela1, Juergen Koepke1, Henry J Dick2, Roman E Botcharnikov1, Thomas Kuhn3 and Andrzej Muszynski4, (1)Leibniz University of Hannover, Institut für Mineralogie, Hannover, Germany, (2)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (3)Bundesanstalt fuer Geowissenschaften und Rohstoffe, Hannover, Germany, (4)Adam Mickiewicz University, Poznań, Poland
Relationship between Tectonics and Geochemistry at the Mid-Atlantic Ridge from Kane to Atlantis. (189594)
Jocelyn Fuentes, Harvard University, Department of Earth and Planetary Sciences, Cambridge, MA, United States, Charles H Langmuir, Harvard University, Earth and Planetary Sciences, Cambridge, MA, United States, Javier Escartin, Institut de Physique du Globe, Paris, France, Cedric Hamelin, Independant scholar, Bergen, Norway, Jonathan Tucker, Harvard University, Earth and Planetary Sciences, Cambridge, United States and Allison Gale, University of Wisconsin River Falls, River Falls, WI, United States
Segment-scale variations in seafloor volcanic and tectonic processes in the Rainbow region, Mid-Atlantic Ridge (36º N) (184473)
Deborah E Eason1, Robert A Dunn2, Ryuta Arai3, Juan Pablo Canales4 and Robert A Sohn4, (1)University of Hawaii at Manoa, Dept of Earth Sciences, Honolulu, United States, (2)University of Hawaii, Honolulu, United States, (3)JAMSTEC, Yokohama, Japan, (4)Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Formation and Elimination of Segmentation on the Reykjanes Ridge (153668)
Fernando Martinez and Richard N Hey, University of Hawaii at Manoa, HIGP/SOEST, Honolulu, HI, United States
Constructing a High-Resolution Temporal Record of Spreading-Rate Variations Along the Mid-Atlantic Ridge (178491)
Christopher James William Carchedi, Brown University, Providence, United States, Colleen A Dalton, Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, RI, United States and Timothy Herbert, Brown University, Department of Earth, Environmental, and Planetary Sciences, Providence, United States
Seismic volcano-stratigraphic characteristics and igneous province assessment of the Jan Mayen microcontinent, central NE-Atlantic (163501)
Anett Blischke, Iceland GeoSurvey, Branch at Akureyri, Reykjavik, Iceland; University of Iceland, Institute of Earth Science, Reykjavik, Iceland, Sverre Planke, Volcanic Basin Petroleum Research, Oslo, Norway, Christian Tegner, Aarhus University, Centre of Earth System Petrology, Department of Geoscience, Aarhus, Denmark, Carmen Gaina, University of Oslo, Centre for Planetary Habitability (PHAB), Department of Geosciences, Oslo, Norway, Bryndis Brandsdottir, Institute of Earth Sciences, Science Institute, Univ. Iceland, Reykjavik, Iceland, Saemundur A Halldorsson, University of Iceland, Reykjavik, Iceland, Helga M. Helgadottir, Iceland GeoSurvey, Petrology, Reykjavik, Iceland and Anthony A P Koppers, Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, United States
K-Rich Basaltic Sources beneath Ultraslow Spreading Central Lena Trough in the Arctic Ocean (166198)
Xiang Ling1, Jonathan E Snow1 and Yipeng Li2, (1)University of Houston, Earth and Atmospheric Sciences, Houston, TX, United States, (2)University of Alabama, Department of Geological Sciences, Tuscaloosa, United States
Crustal Evolution of the Ultraslow-Spreading Southwest Indian Ridge at 16º-28ºE in the Last 7 Ma (169375)
Caicai Zha, SCSIO South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China and Jian Lin, Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Wide-angle seismic profiles reveal mantle serpentinization beneath NTD of the ultra-slow spreading Southwest Indian Ridge (171994)
Xiongwei Niu1, Jiabiao Li1, Aiguo Ruan2, Zhenli Wu2, Xuelin Qiu3, Minghui Zhao4 and Xiaodong Wei5, (1)Second Institute of Oceanography, Ministry of Natural Resources, Key Laboratory of Submarine Geosciences, Hangzhou, China, (2)Second Institute of Oceanography, State Oceanographic Administration of China, Hangzhou, China, (3)SCSIO South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China, (4)Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou, China, (5)Second Institute of Oceanography, Ministry of Natural Resources, China, Hangzhou, China
P wave receiver functions reveal thinner mantle transition zone and low crustal velocity layer beneath Longqi hydrothermal vent at the ultra-slow spreading Southwest Indian Ridge (174919)
Hao Hu1, Aiguo Ruan2, Jiabiao Li3, Xiongwei Niu3, Xiaodong Wei4, Jie Zhang2 and Aoxing Wang2, (1)Zhejiang University, Department of Earth Science, Hangzhou, China, (2)Second Institute of Oceanography, State Oceanographic Administration of China, Hangzhou, China, (3)Second Institute of Oceanography, Ministry of Natural Resources, Key Laboratory of Submarine Geosciences, Hangzhou, China, (4)Second Institute of Oceanography, Ministry of Natural Resources, China, Hangzhou, China
Exploring tectonomagmatic controls on mid-ocean ridge faulting and morphology with 3-D numerical models (189686)
Samuel M Howell1, Garrett Ito2, Mark D Behn3, Jean-Arthur L Olive4, Boris J P Kaus5, Anton Popov5, Eric L Mittelstaedt6 and Thomas A Morrow7, (1)University of Hawaii at Manoa, Honolulu, United States, (2)University of Hawaii, Department of Earth Sciences, Honolulu, United States, (3)Woods Hole Oceanographic Institution, Geology and Geophysics, Woods Hole, MA, United States, (4)WHOI, Woods Hole, United States, (5)Johannes Gutenberg University of Mainz, Institute for Geosciences, Mainz, Germany, (6)University of Idaho, Moscow, ID, United States, (7)University of Idaho, Moscow, United States
Modeling Major and Trace Element Magma Compositions at Slow and Ultra-Slow Spreading Mid-Ocean Ridges: Implications for Melting in the Garnet Field (178236)
Stephanie M Krein, Massachusetts Institute of Technology, Earth, Atmospheric and Planetary Sciences, Cambridge, MA, United States, Mark D Behn, Woods Hole Oceanographic Institution, Geology and Geophysics, Woods Hole, MA, United States, Alison M Shaw, Woods Hole Oceanographic Inst., Woods Hole, MA, United States and Timothy L Grove, Massachusetts Institute of Technology, Department of Earth, Atmospheric and Planetary Sciences, Cambridge, United States
Isotopically enriched N-MORB: a new geochemical signature for plume-ridge interaction (178932)
Alexandra Yang Yang1, Taiping Zhao1 and Mei-Fu Zhou2, (1)GIG Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China, (2)The University of Hong Kong, Hong Kong, China
Morphology of oceanic ridges in spreading colloidal suspensions: Influence of spreading rate and lithospheric thickness (158633)
Aurore Sibrant1, Anne Davaille2 and Eric L Mittelstaedt1, (1)University of Idaho, Moscow, ID, United States, (2)CNRS / University Paris-Sud, Laboratoire FAST, Orsay, France
A simple scaling model for smooth vs. rough bathymetry along hotspot tracks (168958)
Felipe Orellana Rovirosa, University of California Berkeley, Berkeley, CA, United States and Mark A Richards, University of California Berkeley, Department of Earth and Planetary Science, Berkeley, CA, United States
Tectonic setting and strain analysis of Halaban Area, Eastern Arabian Shield, Saudi Arabia (148055)
Yousef ALI Alamri II and Osama M. K. Kassem, King Saud University, Geology, Riyadh, Saudi Arabia

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