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ODP Sites 1253 and 1
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2009
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Global
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Project Title: |
Collaborative Research: Chemical, pressure, temperature, and flow constraints on hydrologic horizons in the Costa Rica Subduction zone, ODP Sites 1253 and 1255 |
Project Status: |
Submitted |
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Principal Investigator: |
Charles G. Wheat, UAF_CFOS |
Project Institution: |
UAF_CFOS |
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Project ID: |
101477 |
Version #: |
4 |
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Date Submitted: |
2/12/2008 3:06:00 PM |
Created By: |
Charles G. Wheat |
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Date Last Modified: |
7/30/2008 10:25:00 AM |
URI Serial #: |
None |
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Funding Agencies: |
NSF/OCE/ODP - 0825788 - Funded |
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Summary of Field Work: |
During Leg 205 of the Ocean Drilling Program (ODP) two boreholes were drilled into active hydrologic formations on the Costa Rica margin west of the Nicoya Peninsula. One borehole penetrated through the overriding plate into the décollement at ODP Site 1255. The other borehole penetrated through the subducting sediment section and plate into permeable igneous basement at ODP Site 1253. These two boreholes were sealed and instrumented with a borehole observatory (CORK), allowing pressure, temperature, fluid flow velocity, and fluid chemical composition to be measured within the formation. The 1.5-yr pressure and two-year temperature, fluid velocity, and fluid chemical composition records collected to date have provided a basic knowledge of formation properties, although fluids within the boreholes had yet to reach “steady state” with the surrounding formations. The data also provide evidence that tectonic forcing related to subduction results in measurable transients in pressure, temperature, fluid velocity, and fluid composition within the décollement. While the initial data provide a baseline for approaching several important scientific and technical questions, they have raised new key questions that will be addressed from additional continuous borehole data. We propose a 6-day submersible or ROV operation to retrieve instruments and stored data that will provide a continuous record of formation temperature, pressure, fluid flow rate, and chemical composition for an additional five years, from the time of the last visit in 2004 to 2009. This modest effort will result in an extremely valuable long-term synchronous record of hydrologic, geochemical, and geodynamic activity at this subduction zone, and establish a technical and scientific foundation for future borehole studies in a broad range of tectonically and hydrologically active settings. |
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Summary of Facility Requirements: |
We request one expedition with an ROV or submersible in early CY 2009. During this time, we will recover both borehole packages deployed in Aug. 2004 and service the wellhead pressure instrumentation at both of these sites. Servicing of these boreholes includes downloading pressure data and determining the extent of sensor drift for pressure and time. In addition, we will conduct initial hydrologic tests (monitor fluid flow rate and pressure simultaneously) using a ball-flow meter package that was deployed successfully on the Juan de Fuca CORKs. One dive at each site is required to recover the borehole packages and download data. A second dive at each site is required to seal the borehole, conduct additional pressure-related tests and initial flow meter tests. The seal will eliminate exchange between bottom seawater and the formation at depth. No new instrumentation is included in this lean proposal, leaving room for future experiments that can be tied directly to new drilling and monitoring programs. Nevertheless, based on power consumption and battery capacity, existing formation-pressure- and seafloor-temperature monitoring instruments should remain functional for at least 12 years and possibly longer. Thus, no funds for new instruments or battery packs are requested in this proposal. In addition, one dive for each site is required to account for weather/contingency issues for a total request of 6 dives. During one or more of the dives we will recover two seafloor temperature/OsmoSampler packages that were deployed during the last dive program in August 2004, and a current meter mooring that was deployed in 2005 by Richard Thomson (Institute of Ocean Sciences). These packages were deployed to assess variations in the bottom boundary currents and conditions. |
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Summary of other requirements and comments: |
Need either Jason II or Alvin for 6 dives on the Costa Rica CORKs. |
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Type of Request: |
Primary Ship Use |
Request Status: |
Submitted |
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Request ID: |
1001936 |
Created By: |
Charles G. Wheat |
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Date Last Modified: |
2/12/2008 3:52:00 PM |
Date Submitted: |
2/12/2008 3:46:00 PM |
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Year: |
2009
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Ship/Facility: |
Global
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Optimum Start Date:
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3/1/2009 |
Dates to Avoid: |
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Earliest Start Date: |
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Multi-Ship Op: |
No |
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Latest Start Date: |
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Other Ship(s): |
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Operating Days Needed: |
Science Days |
Mob Days |
De-Mob Days |
Estimated Transit Days |
Total Days |
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6 |
0 |
0 |
0 |
6 |
Repeating Cruise?
(within same year) |
No |
Interval: |
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# of Cruises: |
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Description of Repeating cruise requirements: |
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Justification/Explanation for ship choice, dates,
conflicts, number of days & multi-ship operations: |
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Short Description of Op Area
for use in schedules: |
Costa Rica |
| Description of Op Area: |
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| Op Area Size/Dia.: |
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Lat/Long |
Marsden Grid |
Navy Op Area |
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Beginning
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Ending
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Foreign Clearance Required? |
Yes |
Coastal States:
Costa Rica |
 Important Info on Foreign Research Clearances
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Are you or any member in your science party bringing in any science equipment items which are regulated for export by the International Traffic in Arms Regulations (ITAR) and/or the Export Administration Regulations (EAR)?
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No |
If yes, have you applied for the necessary permits through your export control office?
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No |
| Questions about ITAR/EAR regulations?
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Comments about foreign clearance requirements or
description of any other special permitting requirements
(e.g., MMPA, ESA, IHA, Marine Sanctuaries, etc.) |
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Requested Start Port |
Intermediate Port(s) |
Requested End Port |
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None |
None |
None |
Explanation/justification for requested
ports and dates of intermediate stops
or to list additional port stops |
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Important Info on Working in Foreign Ports
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Chief Scientist: |
Charles G. Wheat, UAF_CFOS |
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# in Science Party |
8 |
# of different science teams |
4 |
# Marine Technicians to be
provided by ship operator:
(include in science party total)
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1 |
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Explanation of Science Party Requirements and Technician Requirements |
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 Dynamic Positioning |  ADCP | Multibeam | Seismic |
| Dredging/Coring/Large Dia. Trawl Wire | Stern A-frame | Fiber Optic (.681) | 0.680 Coax Wire |
| SCUBA Diving | Radioisotope use - briefly describe | NO Radioisotope use/Natural level work | Other Operator Provided Inst. - Describe |
| 0 PI-Provided Vans - briefly describe | MOCNESS | | |
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Explain Instrumentation or Capability
requirements that could affect choice
of ship in scheduling. |
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Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
Either vehicle works fine |
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