Nonvolcanic seafloor spreading and corner-flow rotation accommodated by extensional faulting at 15 °N on the Mid- Atlantic Ridge: A structural synthesis of ODP Leg 209

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dc.contributor.authorSchroeder, Timothy
dc.contributor.authorCheadle, Michael J.
dc.contributor.authorDick, Henry J. B.
dc.contributor.authorFaul, Ulrich
dc.contributor.authorCasey, John F.
dc.contributor.authorKelemen, Peter B.
dc.date.accessioned2016-12-09T15:26:31Z
dc.date.available2016-12-09T15:26:31Z
dc.date.issued2007-06
dc.description.abstractAbstract: Drilling during ODP Leg 209, dredging, and submersible dives have delineated an anomalous stretch of the Mid-Atlantic Ridge north and south of the 15°20'N Fracture Zone. The seafloor here consists dominantly of mantle peridotite with gabbroic intrusions that in places is covered by a thin, discontinuous extrusive volcanic layer. Thick lithosphere (10–20 km) in this region inhibits magma from reaching shallow levels beneath the ridge axis, thereby causing plate accretion to be accommodated by extensional faulting rather than magmatism. The bathymetry and complex fault relations in the drill-core suggest that mantle denudation and spreading are accommodated by a combination of high-displacement, rolling-hinge normal faults and secondary lower-displacement normal faults. These extensional faults must also accommodate corner flow rotation (up to 90 °) of the upwelling mantle within the shallow lithosphere, consistent with remnant magnetic inclinations in denuded peridotite and gabbro from Leg 209 core that indicate up to 90 ° of sub-Curie-temperature rotation. Keywords: seafloor spreading; ocean drilling program; nonvolcanic mid-ocean ridges; extensional faulting.en_US
dc.identifier.citationSchroeder, Timothy; Cheadle, Michael J.; Dick, Henry J. B.; Faul, Ulrich; Casey, John F.; Kelemen, Peter B. Nonvolcanic seafloor spreading and corner-flow rotation accommodated by extensional faulting at 15 °N on the Mid- Atlantic Ridge: A structural synthesis of ODP Leg 209. Geochemistry, Geophysics, Geosystems Volume 8, Number 6 28 June 2007 Q06015, doi:10.1029/2006GC001567 ISSN: 1525-2027en_US
dc.identifier.urihttp://hdl.handle.net/11209/10683
dc.language.isoenen_US
dc.publisherWiley American Geophysical Unionen_US
dc.subjectMarine Geology and Geophysics - Midocean ridge processesen_US
dc.subjectMarine Geology and Geophysics - Plate tectonicsen_US
dc.subjectMarine Geology and Geophysics: Ocean drillingen_US
dc.titleNonvolcanic seafloor spreading and corner-flow rotation accommodated by extensional faulting at 15 °N on the Mid- Atlantic Ridge: A structural synthesis of ODP Leg 209en_US
dc.typeArticleen_US

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