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.

Walther, Christian and Flueh, Ernst R. (2002) 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. Geophysical Research Letters, 29 (19). p. 1939. DOI 10.1029/2002GL015026.

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Abstract

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.

Document Type: Article
Research affiliation: OceanRep > SFB 574
OceanRep > SFB 574 > A2
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2002GL015026
ISSN: 0094-8276
Projects: PAGANINI
Contribution Number:
ProjectNumber
SFB 57417
Expeditions/Models/Experiments:
Date Deposited: 07 Apr 2010 11:51
Last Modified: 20 Feb 2018 08:09
URI: http://oceanrep.geomar.de/id/eprint/7073

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