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Browse MARGINS Awards in reverse chronological order after start date (most recent first):

Indirect Study of Subducted Oceanic Lithosphere at the Central American Margin

   
NSF Org OCE
Latest Amendment Date May 6, 2002
Award Number 0203636
Award Instrument Standard Grant
Program Manager Bilal U. Haq
OCE DIVISION OF OCEAN SCIENCES
GEO DIRECTORATE FOR GEOSCIENCES
Start Date January 1, 2003
Expires December 31, 2004 (Estimated)
Expected Total Amount $182,166 (Estimated)
Investigator Peter F. Lonsdale (Principal Investigator current)
Paterno R. Castillo (Co-Principal Investigator current)
Sponsor U of Cal SD Scripps Inst
9500 Gilman Drive
La Jolla, CA 92093 858/534-1293
NSF Program 1620 MARINE GEOLOGY AND GEOPHYSICS
Field Application 0204000 Oceanography
Abstract The PIs plan mapping and sampling features on the Cocos and Nazca plates to provide a basis for inferring the properties of the subducted Cocos plate under Central America. The basic premise is that the Nazca plate south of Grijalva was formerly contiguous with Cocos plate under Nicaragua and parts of Costa Rica and that this fossil plate boundary could form an important structure in the down-going slab. Because a small fragment remains unsubducted, the investigators propose to not only study it, but also it's conjugate off Peru, where much more remains. At that locality, the structure can be mapped more thoroughly and the results extrapolated to the subducted slab beneath Costa Rica. Further, dredging will provide essential samples to measure the composition of the lithosphere that is beneath the Central American arc.