Award Abstract # 0118478
Collaborative Research: Long-term Continuous Monitoring of Pressure, Fluid Chemistry, and Hydrology in Instrumented Boreholes at the Costa Rica Subduction Zone

NSF Org: OCE
Division Of Ocean Sciences
Recipient: UNIVERSITY OF CALIFORNIA SAN DIEGO
Initial Amendment Date: September 26, 2001
Latest Amendment Date: August 28, 2004
Award Number: 0118478
Award Instrument: Standard Grant
Program Manager: Rodey Batiza
OCE
 Division Of Ocean Sciences
GEO
 Directorate for Geosciences
Start Date: October 1, 2001
End Date: September 30, 2006 (Estimated)
Total Intended Award Amount: $599,091.00
Total Awarded Amount to Date: $762,388.00
Funds Obligated to Date: FY 2001 = $599,091.00
FY 2004 = $163,297.00
History of Investigator:
  • Miriam Kastner (Principal Investigator)
    mkastner@ucsd.edu
Recipient Sponsored Research Office: University of California-San Diego Scripps Inst of Oceanography
8622 DISCOVERY WAY # 116
LA JOLLA
CA  US  92093-1500
(858)534-1293
Sponsor Congressional District: 50
Primary Place of Performance: University of California-San Diego Scripps Inst of Oceanography
8622 DISCOVERY WAY # 116
LA JOLLA
CA  US  92093-1500
Primary Place of Performance
Congressional District:
50
Unique Entity Identifier (UEI): QJ8HMDK7MRM3
Parent UEI: QJ8HMDK7MRM3
NSF Program(s): OCEAN DRILLING PROGRAM
Primary Program Source: 01000102DB NSF RESEARCH & RELATED ACTIVIT
app-0104 
Program Reference Code(s): 0000, 5720, OTHR
Program Element Code(s): 572000
Award Agency Code: 4900
Fund Agency Code: 4900
Assistance Listing Number(s): 47.050

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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