T033:
Shaping Slow- and Ultraslow-Spreading Seafloor with Faults, Magma, and Fluids.

Submit an Abstract to this Session



Session ID#: 23613

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, Woods Hole Oceanographic Institution, Department of Geology & Geophysics, Woods Hole, MA, 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
Co-Organized with:
Tectonophysics, and Volcanology, Geochemistry and Petrology

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:

Marion Giusti1, Robert P Dziak2, Marcia Maia1, Julie Perrot1 and Alexey Sukhovich3, (1)CNRS-Université de Bretagne Occidentale, Laboratoire Géosciences Océan, Institut Universitaire Européen de la Mer, Plouzané, France, (2)NOAA, Pacific Marine Environmental Laboratory, Newport, OR, United States, (3)CNRS-Université de Bretagne Occidentale, Laboratoire Géosciences Océan, Institut Universitaire Européen de la Mer, Plouzane, France
Tingting Zheng1, Brian E Tucholke2 and Jian Lin1,2, (1)Tongji University, Shanghai, China, (2)Woods Hole Oceanographic Institution, Department of Geology and Geophysics, Woods Hole, MA, United States

See more of: Tectonophysics