Morphology and structure of the Galapagos Rise |
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| Authors: | GL Johnson PR Vogt R Hey J Campsie A Lowrie |
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| Institution: | 1. Office of Naval Research, Arlington, Va. U.S.A.;2. U.S. Naval Oceanographic Office, Chesapeake Beach, Md. U.S.A.;3. Hawaii Institute of Geophysics, University of Hawaii, Honolulu, Hawaii U.S.A.;4. Ocean Study Group, Copenhagen Denmark |
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| Abstract: | Geophysical data collected on three U.S. Naval Oceanographic Office cruises to the Galapagos Rise are presented. These data allow definition of the morphology and structure of the Galapagos Rise.A postulated “hot spot” beneath the Galapagos platform is suggested as the cause of: (1) decreased seismicity along the spreading center for a 400 km E—W distance from the islands; (2) distinctive petro-chemistry of tholeiites from the islands and adjacent oceanic crust generated by the Galapagos Rise; (3) high-amplitude magnetic anomalies in a 1,000 km E—W band including and just north of the Galapagos platform; and (4) morphologic shape and the regionally elevated sea floor of the Galapagos Rise as it approaches the insular platform. |
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