Remnant of the ancient Farallon Plate breakup: A low-velocity body in the lower oceanic crust off Nicoya Peninsula, Costa Rica - evidence from wide-angle seismics

Details Remnant of the ancient Farallon Plate breakup: A low-velocity body in the lower oceanic crust off Nicoya Peninsula, Costa Rica - evidence from wide-angle seismics Remnant of the ancient Farallon Plate breakup: A low-velocity body in the lower oceanic crust off Nicoya Peninsula, Costa Rica - evidence from wide-angle seismics

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29s..45w&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 19, pp. 45-1, CiteID 1939, DOI 10.1029/2002GL015026

Physics

Geophysics

5

Marine Geology And Geophysics: Marine Seismics (0935), Marine Geology And Geophysics: Plate Tectonics (8150, 8155, 8157, 8158), Exploration Geophysics: Oceanic Structures, Information Related To Geographic Region: Pacific Ocean

Scientific paper

A seismic wide-angle section offshore Costa Rica is presented across the boundary between oceanic crust generated at the East Pacific rise (EPR) and at the Galápagos spreading center (GSC) as indicated by magnetic anomalies. This suture, where the Farallon plate broke up ~23 Ma ago, is marked by pronounced velocity variations throughout the crust including a low-velocity body in the lower crust. This body is well constrained by refracted waves above the inversion zone and by strong PmP reflections from its lower boundary. The distinctness of this body and the local gravity field point to an igneous intrusion rather than serpentinized rock. Typical oceanic crust is found adjacent to the suture zone.

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