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dc.contributor.authorCanales, J. Pablo  Concept link
dc.contributor.authorSohn, Robert A.  Concept link
dc.contributor.authordeMartin, Brian J.  Concept link
dc.date.accessioned2010-04-20T13:52:10Z
dc.date.available2010-04-20T13:52:10Z
dc.date.issued2007-08-09
dc.identifier.citationGeochemistry Geophysics Geosystems 9 (2007): Q08004en_US
dc.identifier.urihttps://hdl.handle.net/1912/3260
dc.descriptionAuthor Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 8 (2007): Q08004, doi:10.1029/2007GC001629.en_US
dc.description.abstractNew seismic refraction data reveal that hydrothermal circulation at the Trans-Atlantic Geotraverse (TAG) hydrothermal field on the Mid-Atlantic Ridge at 26°10′N is not driven by energy extracted from shallow or mid-crustal magmatic intrusions. Our results show that the TAG hydrothermal field is underlain by rocks with high seismic velocities typical of lower crustal gabbros and partially serpentinized peridotites at depth as shallow as 1 km, and we find no evidence for low seismic velocities associated with mid-crustal magma chambers. Our tomographic images support the hypothesis of Tivey et al. (2003) that the TAG field is located on the hanging wall of a detachment fault, and constrain the complex, dome-shaped subsurface geometry of the fault system. Modeling of our seismic velocity profiles indicates that the porosity of the detachment footwall increases after rotation during exhumation, which may enhance footwall cooling. However, heat extracted from the footwall is insufficient for sustaining long-term, high-temperature, hydrothermal circulation at TAG. These constraints indicate that the primary heat source for the TAG hydrothermal system must be a deep magma reservoir at or below the base of the crust.en_US
dc.description.sponsorshipThis research was supported by NSF grant OCE-0137329.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttps://doi.org/10.1029/2007GC001629
dc.subjectTAG hydrothermal fielden_US
dc.subjectCrustal structureen_US
dc.subjectDetachment faultingen_US
dc.subjectMid-Atlantic Ridgeen_US
dc.subjectSlow spreading ridgeen_US
dc.titleCrustal structure of the Trans-Atlantic Geotraverse (TAG) segment (Mid-Atlantic Ridge, 26°10′N) : implications for the nature of hydrothermal circulation and detachment faulting at slow spreading ridgesen_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2007GC001629


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