T33G:
Shaping Slow and Ultraslow Spreading Seafloor with Faults, Magma, and Fluids II Posters


Submit an Abstract to this Session


Session ID#: 48301

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 occurs in a thick brittle lithosphere and is accommodated by a combination of magmatic and tectonic extension, leading to deformation often dominated by large-offset detachment faults.  The ridge magma supply is highly variable in space and time, and the 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:  Manon Bickert, Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Paris, France
Conveners:  Luc Lavier, University of Texas at Austin, Institute for Geophysics, Austin, TX, United States and Jean-Arthur L Olive, Ecole Normale Superieure Paris/CNRS, Laboratoire de geologie, Paris, France
Primary Liaison:  Manon Bickert, Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Paris, France
Chairs:  Manon Bickert, Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Paris, France, Jean-Arthur L Olive, WHOI, Woods Hole, United States and Luc Lavier, University of Texas at Austin, Institute for Geophysics, Austin, TX, United States
OSPA Liaison:  Jean-Arthur L Olive, WHOI, Woods Hole, United States

Cross-Listed:
  • OS - Ocean Sciences
Index Terms:

3035 Midocean ridge processes [MARINE GEOLOGY AND GEOPHYSICS]
8034 Rheology and friction of fault zones [STRUCTURAL GEOLOGY]
8135 Hydrothermal systems [TECTONOPHYSICS]
8178 Tectonics and magmatism [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Temporal variability of seafloor spreading processes documented along an 80-Myr geophysical transect across the Mid-Atlantic Ridge (421521)
William Joseph Shinevar1, Hannah F Mark2, Fiona Clerc3, Emmanuel Codillo4, Jean-Arthur L Olive5, Jianhua Gong1, Stephanie M Krein6, Paris Todd Smalls7, Yang Liao8, Véronique Le Roux9 and Mark D Behn10, (1)Woods Hole Oceanographic Institution, Woods Hole, United States, (2)Massachusetts Institute of Technology, Cambridge, United States, (3)McGill University, Montreal, QC, Canada, (4)University of the Philippines, NIGS, Diliman, Philippines, (5)CNRS / Ecole Normale Superieure, Laboratoire de Geologie de l'ENS, Paris, France, (6)Massachusetts Institute of Technology, Earth, Atmospheric and Planetary Sciences, Cambridge, MA, United States, (7)University of South Carolina Columbia, Columbia, United States, (8)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (9)Woods Hole Oceanographic Inst, Geology & Geophysics Department, Woods Hole, United States, (10)Boston College, Earth and Environmental Sciences, Chestnut Hill, MA, United States
Global sea-level forcing of abyssal hills (455885)
Parker Liautaud, Harvard University, Cambridge, MA, United States, Richard F Katz, University of Oxford, Department of Earth Sciences, Oxford, United Kingdom, Charles H Langmuir, Harvard University, Earth and Planetary Sciences, Cambridge, United States, Cristian Proistosescu, University of Illinois Urbana Champaign, Department of Climate, Meteorology & Atmospheric Sciences, Urbana, United States and Peter J Huybers, Harvard University, Department of Earth and Planetary Sciences, Cambridge, MA, United States
Modeling interactions between plate-boundary forces and evolving resistance at mid-ocean ridges as the origin of non-uniform seafloor growth (447391)
Hee Choi, Georgia Institute of Technology Main Campus, School of Earth and Atmospheric Sciences, Atlanta, United States, Eunseo Choi, PhD, University of Memphis, Center for Earthquake Research and Information, Memphis, TN, United States and Robert Reece, Texas A&M University, Geology and Geophysics, College Station, TX, United States
Mapping Tectonic Features Along and Across Axis at the Mid-Atlantic Ridge at 14N (448513)
Genesee Malekah Lucia, Boise State University, Geosciences, Boise, ID, United States, V Dorsey Wanless, Boise State University, Department of Geosciences, Boise, United States, Adam A Soule, WHOI, Narragansett, United States, Eric L Mittelstaedt, University of Idaho, Department of Earth and Spatial Sciences, Moscow, ID, United States and Mark D Kurz, WHOI, Department of Marine Chemistry & Geochemistry, Woods Hole, United States
Connections between changing axial magma flux and oceanic core complex formation along the Marathon Fracture Zone, Mid-Atlantic Ridge at ~12°N (451005)
Daniel King, University of Idaho, Department of Earth and Spatial Sciences, Moscow, ID, United States, Eric L Mittelstaedt, University of Idaho, Moscow, ID, United States, V Dorsey Wanless, Boise State University, Department of Geosciences, Boise, United States, Mark D Kurz, Woods Hole Oceanographic Institution, Department of Marine Chemistry & Geochemistry, Woods Hole, United States, Adam A Soule, University of Rhode Island - Graduate School of Oceanography, Narragansett, United States, Daniel J Fornari, Woods Hole Oceanographic Institution, Department of Geology and Geophysics, Woods Hole, MA, United States and Frieder Klein, Woods Hole Oceanographic Institution, Marine Chemistry and Geochemistry, Woods Hole, United States
Time-variable strength of axial lithosphere at slow-spreading ridges and the lifespan of oceanic core complexes (453222)
Hao Lu, University of Memphis, Memphis, TN, United States and Eunseo Choi, PhD, University of Memphis, Center for Earthquake Research and Information, Memphis, TN, United States
How to make detachment faults at melt-starved mid-ocean ridges that have a very thick axial lithosphere? (408815)
Manon Bickert, Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Paris, France, Luc Lavier, University of Texas at Austin, Institute for Geophysics, Austin, TX, United States, Mathilde Cannat, Institut de Physique du Globe de Paris, Paris, France, Andrea Tommasi, University of Montpellier, Montpellier Cedex 5, France and Suzon Jammes, Texas State University, Department of Geography, San Marcos, TX, United States
No evidence of progressive serpentinization at slow-slip oceanic transform faults: Geophysical constraints from the Vema Transform, Central Atlantic (433484)
Marco Cuffaro1, Marco Ligi2 and Enrico Bonatti2,3, (1)IGAG-CNR, Rome, Italy, (2)CNR Institute for Marine Science, Bologna, Italy, (3)Lamont Doherty Earth Observatory, Columbia University, Palisades, United States
Long-Term Evolution of Non-Transform Discontinuities at the Mid-Atlantic Ridge, 24°N - 27°30′N and 0 – 25 Ma (370166)
Tingting Zheng1,2, Brian E Tucholke2 and Jian Lin3,4, (1)State Key Laboratory of Marine Geology, School of Ocean and Earth Science, Tongji University, Shanghai, China, (2)Woods Hole Oceanographic Institution, Department of Geology and Geophysics, Woods Hole, MA, United States, (3)Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (4)Tongji University, State Key Laboratory of Marine Geology, Shanghai, China
Serpentinized mantle exhumation versus magmatic accretion at ultraslow spreading rates: constraints from seismic data and Vp/Vs ratios, Mid-Cayman Spreading Centre, Caribbean Sea (404307)
Ingo Grevemeyer1, Nicholas W Hayman2, Christine Peirce3, Michaela Schwardt4, Harm J Van Avendonk5, Anke Dannowski1 and Cord A Papenberg1, (1)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (2)University of Oklahoma, Oklahoma Geological Survey, Norman, United States, (3)University of Durham, Durham, United Kingdom, (4)University of Kiel, Institute of Geosciences, Kiel, Germany, (5)University of Texas at Austin, Institute for Geophysics, Austin, TX, United States
Influence of fault zones on the self-organization of hydrothermal outflow and recharge: Constraints from analog experiments (398227)
Eric L Mittelstaedt, University of Idaho, Moscow, ID, United States, Jean-Arthur L Olive, CNRS / Ecole Normale Superieure, Laboratoire de Geologie de l'ENS, Paris, France and Thibaut Barreyre, Department of Earth Science, University of Bergen, Bergen, Norway
Distribution of major and trace elements in sediments from the hydrothermal fields in the mid-west Indian Ocean (428781)
Huaiming Li1, Yikang Huang2, Xiaoxia Lv2, Xihe Yue2 and Yuan Wang1, (1)The Second Institute of Oceanography,State Oceanic Administration, Key Laboratory of Submarine Geosciences, Hangzhou, China, (2)China University of Geosciences, College of Marine Science and Technology, Wuhan, China
Along-Axis Lower Crustal Magmatic Flow In The Neotethyan Spreading System (353946)
Antony Morris, University of Plymouth, School of Geography, Earth and Environmental Sciences, Plymouth, United Kingdom, Mark W Anderson, University of Plymouth, Plymouth, United Kingdom, Ahmed Fatih Omer and Osman Parlak, Çukurova Üniversitesi, Jeoloji Mühendisliği Bölümü, Adana, Turkey
Analysis of Hydrothermal Alteration in Abyssal Peridotites from the Gakkel Ridge (420775)
Sierra Patterson1, Kendra J Janell Lynn2, Cécile Prigent3 and Jessica M Warren2, (1)University of Delaware, Newark, DE, United States, (2)University of Delaware, Earth Sciences, Newark, DE, United States, (3)Institut de Physique du Globe de Paris, Paris, France
Petrogenesis of non-popping rock lavas at 14°N on the Mid-Atlantic Ridge (417553)
Alex R Schweitzer, Boise State University, Boise, ID, United States, V Dorsey Wanless, WHOI, Woods Hole, United States, Emma E McCully, Woods Hole Oceanographic Institution, Woods Hole, MA, United States, Mark D Kurz, WHOI, Department of Marine Chemistry & Geochemistry, Woods Hole, United States, Eric L Mittelstaedt, University of Idaho, Department of Earth and Spatial Sciences, Moscow, ID, United States and Adam A Soule, WHOI, Narragansett, United States
Investigating Geochemical Diversity Along a Slow-Spreading Axis: Insights into the Popping Rocks Region (441573)
Emma E McCully1, V Dorsey Wanless2, Mark D Kurz3, Eric L Mittelstaedt4, Adam A Soule5 and Alex R Schweitzer1, (1)Boise State University, Boise, ID, United States, (2)WHOI, Woods Hole, United States, (3)WHOI, Department of Marine Chemistry & Geochemistry, Woods Hole, United States, (4)University of Idaho, Department of Earth and Spatial Sciences, Moscow, ID, United States, (5)WHOI, Narragansett, United States

See more of: Tectonophysics