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This site is maintained by the MARGINS Office. Please share your comments and suggestions with us.
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Browse MARGINS-related
awards in reverse chronological order after start
date (most recent first):
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Collaborative Research: Long Term Continuous Monitoring of Pressure,
Fluid Chemistry and Hydrology in Instrumented Boreholes at the Costa
Rica Subduction Zone
| MARGINS Focus Area |
Subduction Factory |
| NSF Org |
OCE |
| Latest Amendment Date |
September 26, 2001 |
| Award Number |
0118422 |
| Award Instrument |
Standard Grant |
| Program Manager |
Bradford M. Clement
OCE DIVISION OF OCEAN SCIENCES
GEO DIRECTORATE FOR GEOSCIENCES |
| Start Date |
October 1, 2001 |
| Expires |
September 30, 2005 (Estimated) |
| Expected Total Amount |
$355,432 (Estimated) |
| Investigator |
Hans W. Jannasch (Principal
Investigator current) |
| Sponsor |
MBARI
7700 Sandholdt Road
Moss Landing, CA 95039 |
| NSF Program |
5720 OCEAN DRILLING PROGRAM |
| Field Application |
0204000 Oceanography |
| Abstract |
This project will continuously monitor the pressure, fluid chemistry,
and hydrology in two instrumented boreholes at the Costa Rica subduction
zone, using long-term observatories (CORK and ACORK) installed during
ODP Leg 203. The field program will 1) deploy pressure gauges and
data loggers, OsmoSamplers, and osmotic flow meters in 3 CORKed
boreholes along a transect across the deformation front of the subduction
zone and 2) retrieve the OsmoSamplers, data stored in the data loggers
and deploying new OsmoSamplers and pressure gauges, with the submersible
Alvin. The fluid stored in the OsmoSamplers will provide a continuous
1.3 year record of fluid conditions collected at in situ conditions
at weekly resolution, in three distinct hydrogeologic systems. The
first flow system is the upper oceanic crust of the incoming Cocos
Plate, the second is the return of a deeply sourced fluid along
the decollement and the third is in the underthrust sediment section
driven by compaction dewatering. By documenting the nature of these
hydrogeologic systems it will be possible to better understand the
effects of fluid flow at convergent margins on the shallow thermal
structure and fluid content of the downgoing plate, the physical
properties of the subduction zone interface, deformation style and
transport of elements to the oceans. |
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