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Browse MARGINS
Awards in reverse chronological order after start
date (most recent first):
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Collaborative Research: The Thermal State of 20-25 Ma Lithosphere
Suducting 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 |
0002031 |
| 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 |
$300,134 (Estimated) |
| Investigator |
C. Geoffrey Wheat (Principal
Investigator current) |
| Sponsor |
U of Alaska Fairbanks
109 ASC
Fairbanks, AK 99775 |
| 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. |
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