T32A:
Accretion Modes, Structure, and Processes at Slow- and Ultra-slow Spreading Mid-Ocean Ridges I

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Session ID#: 16570

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 Roger C Searle, University of Durham, Durham, United Kingdom
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:

Model for the Evolution of an Oceanic Core Complex and its Hydrothermal Vent on the Ultraslow-Spreading Mid Cayman Spreading Center (122147)
Jennifer Harding, University of Texas at Austin, Austin, TX, United States, Harm J Van Avendonk, University of Texas at Austin, Institute for Geophysics, Austin, TX, United States, Nicholas W Hayman, Institute for Geophysics, Austin, TX, United States, Ingo Grevemeyer, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany and Christine Peirce, University of Durham, Durham, United Kingdom
The role of detachment faulting in slow seafloor spreading: First results from cruise JC132 to the MAR at 13N (Invited) (159614)
Reston J Tim1, Matthew Falder1, Christine Peirce2, Nuno Simão2, Roger C Searle2 and Christopher J MacLeod3, (1)University of Birmingham, School of Geography, Earth and Environmental Sciences, Birmingham, B15, United Kingdom, (2)University of Durham, Durham, United Kingdom, (3)Cardiff University, School of Earth and Environmental Sciences, Cardiff, United Kingdom
Popping Rocks from the Mid-Atlantic Ridge at 13.77° N (Invited) (163075)
Mark D Kurz1, Eric L Mittelstaedt2, V. Dorsey Wanless3, Adam A Soule4, Daniel J Fornari5, Max Jones6, Joshua Curtice4, Sandrine Peron7, Frieder Klein8, Darin M Schwartz9, Kate Kaminski2 and Javier Escartin10, (1)WHOI, Department of Marine Chemistry & Geochemistry, Woods Hole, United States, (2)University of Idaho, Moscow, ID, United States, (3)Boise State University, Department of Geosciences, Boise, United States, (4)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (5)Woods Hole Oceanographic Institution, Department of Geology and Geophysics, Woods Hole, MA, United States, (6)Massachusetts Institute of Technology, Cambridge, MA, United States, (7)Institut de Physique du Globe de Paris, Paris, France, (8)Woods Hole Oceanographic Institution, Marine Chemistry and Geochemistry, Woods Hole, United States, (9)Boise State University, Department of Geosciences, Boise, ID, United States, (10)Institut de Physique du Globe, Paris, France
Ultraslow ridge tectonics controlled by deep hydrothermal processes in the absence of a magmatic input (153198)
Jean-Arthur L Olive1, Timothy J Crone2 and W Roger Buck2, (1)Lamont -Doherty Earth Observatory, Palisades, NY, United States, (2)Lamont-Doherty Earth Observatory, Palisades, NY, United States
Records of upper mantle oxygen fugacity gleaned from high-density sampling of basalts and peridotites at ultraslow ridges (163630)
Suzanne Katherine Birner, Stanford University, Stanford, United States, Elizabeth Cottrell, Smithsonian, NMNH, Department of Mineral Sciences, Washington, DC, United States, Jessica M Warren, University of Delaware, Earth Sciences, Newark, DE, United States, Katherine A Kelley, University of Rhode Island, Graduate School of Oceanography, Narragansett, RI, United States and Fred A Davis, University of Minnesota Duluth, Duluth, United States
3D seismic reflection imaging of nearly amagmatic oceanic lithosphere at the ultra-slow spreading Southwest Indian Ridge (175254)
Ekeabino Imoitsike Momoh1, Mathilde Cannat1, Satish Chandra Singh1, Louise Watremez2 and Sylvie D Leroy3, (1)Institut de Physique du Globe de Paris, Paris, France, (2)University of Southampton, Southampton, United Kingdom, (3)University Pierre and Marie Curie Paris VI, ISTEP, Paris, France
Effects of axially variable diking rates on faulting at slow spreading mid-ocean ridges (181059)
Eunseo Choi, PhD, University of Memphis, Center for Earthquake Research and Information (CERI), Memphis, TN, United States and Dr. Xiaochuan Tian, PhD, Lamont -Doherty Earth Observatory of Columbia University, New York, NY, United States; Sun Yat-Sen University, Guangzhou, China
3-D seismic imaging of lithospheric fault-block structures, core complexes, alteration fronts, and hydrothermal systems along the Mid-Atlantic Ridge, Rainbow area (184689)
Robert A Dunn1, Ryuta Arai2, Deborah E Eason3, Juan Pablo Canales4 and Robert A Sohn4, (1)University of Hawaii at Manoa, Department of Earth Sciences, Honolulu, United States, (2)JAMSTEC, Yokohama, Japan, (3)University of Hawaii at Manoa, Dept of Earth Sciences, Honolulu, United States, (4)Woods Hole Oceanographic Institution, Woods Hole, MA, United States

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