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

Collaborative Research: The Thermal State of 20-25 Ma Lithosphere Subducting at the Costa Rica Margin, Implications for Hydrogeology, Fluxes, and the Seismogenic Zone

MARGINS Focus Area Subduction Factory
NSF Org OCE
Latest Amendment Date September 11, 2000
Award Number 0001941
Award Instrument Standard Grant
Program Manager Bruce T. Malfait
OCE DIVISION OF OCEAN SCIENCES
GEO DIRECTORATE FOR GEOSCIENCES
Start Date October 1, 2000
Expires September 30, 2004 (Estimated)
Expected Total Amount $99,615 (Estimated)
Investigator Carol A. Stein (Principal Investigator current)
Sponsor U of Illinois Chicago
1737 W. Polk Street
Chicago, IL 60612
NSF Program 5720 OCEAN DRILLING PROGRAM
Field Application 0204000 Oceanography
Abstract Recommended project is for a multidisciplinary investigation of the thermal state of the subducting lithosphere offshore of the Costa Rica margin. Heat flow measurements will be undertaken in two cruises covering oceanic lithosphere portions offshore of the Nicoya Peninsula that differ in makeup and tectonic style, with the northern portion formed at the East Pacific Rise and the southern portion, separated by an abrupt change in relief, formed at the Cocos-Nazca spreading center. These measurements will be accompanied by seismic and swath bathymmetric study, as well as a coring program that will examine changes in porewater chemistry associated with fluid flow in the sediments overlying the crust. These field programs will be accompanied by two numerical modeling exercises that will examine the thermal state of the subduction zone as these two portions of lithosphere subduct. The goals will be to determine the comparative thermal state of the subducting lithosphere in these regions, the associated heat and fluid fluxes responsible for the subducting slab thermal states, and how these variable affect subduction zone processes, including chemical flux rates.