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Chukchi Plate
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2011
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USCGC Healy
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Project Title: |
Plate Boundaries around the Chukchi Borderland; An Integrated Geophysics Cruise to test Models for the Formation of Canada Basin |
Project Status: |
Submitted |
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Principal Investigator: |
Bernard Coakley, UAF_G&G |
Project Institution: |
UAF_G&G |
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Project ID: |
101798 |
Version #: |
3 |
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Date Submitted: |
11/18/2008 4:09:00 PM |
Created By: |
Bernard Coakley |
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Date Last Modified: |
3/25/2010 7:07:00 PM |
URI Serial #: |
None |
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Funding Agencies: |
NSF/OPP/ARC - 0909568 - Funded |
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Summary of Field Work: |
The Chukchi Borderland is a block of extended continental crust embedded in the oceanic crust of the Canada Basin. As the piece that does not fit the simple “windshield wiper” model for the Mesozoic opening of this basin, it figures prominently in all tectonic models proposed for the opening of the Amerasian Basin. With multi-channel seismic (MCS) reflection technique, it is possible to test these hypotheses from the US Coast Guard Cutter (USCGC) Healy. Observing the edges of the Chukchi Borderland during an integrated cruise with MCS, gravity, swath bathymetry, and seismic refraction data would make it possible to further constrain models for the opening of the Amerasian Basin.
By imaging the sedimentary section and tracing the continuity of structure, crustal thickness and stratigraphy across the edges of this high-standing continental block, it should be possible to distinguish between strike-slip, extensional and compressional boundaries. By tying the basinal stratigraphy to the well-dated sediments on the Chukchi Shelf (eg. the Shell exploration well Popcorn, among others), it will be possible to propagate seismic stratigraphic age control into the Arctic Ocean basin to date the extensional dissection of the Borderland and lay the groundwork for scientific drilling. |
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Summary of Facility Requirements: |
Require SIO portable MCS system.
Will bring on PI-supplied towing gear for MCS data acquisition in the pack ice as well as sonobuoys and sonobuoy receivers.
Also will require Knudsen 320 B/R sub-bottom profiler, POS/MV ship's positioning system and Bell BGM-3 gravimeter.
Given remote deployment, loss of science is likely outcome of equipment loss or failure. Request dual compressors and spare airguns.
Request dual ~500 cu in or similar volume G guns. To maintain balance on ice towing system these guns should be identical or nearly so. |
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Summary of other requirements and comments: |
Require SIO portable MCS system.
Will bring on PI-supplied towing gear for MCS data acquisition in the pack ice as well as ~200 sonobuoys.
Request additional spares compared to what would be deployed with a typical cruise. Remote deployment requires redundancy and the ability to repair equipment locally. |
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Type of Request: |
Primary Ship Use |
Request Status: |
Submitted |
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Request ID: |
1002529 |
Created By: |
Bernard Coakley |
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Date Last Modified: |
3/25/2010 7:07:00 PM |
Date Submitted: |
11/18/2008 4:09:00 PM |
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Year: |
2011
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Ship/Facility: |
USCGC Healy
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Optimum Start Date:
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9/1/2011 |
Dates to Avoid: |
The schedule is largely dictated by the need to be on the Northern Chukchi in mid-September, the time of the annual ice minimum. |
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Earliest Start Date: |
8/15/2011 |
Multi-Ship Op: |
No |
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Latest Start Date: |
9/7/2011 |
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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26 |
1 |
0 |
7 |
34 |
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: |
Chukchi |
| Description of Op Area: |
Mid-Chukchi Shelf to the northern limit of the Chukchi Borderland and slightly beyond. |
| Op Area Size/Dia.: |
~500 |
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Lat/Long |
Marsden Grid |
Navy Op Area |
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Beginning
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71.85455° N
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165.806917° W
map
71° 51.273' N
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165° 48.41502' W
map
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Ending
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71.85455° N
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165.806917° W
map
71° 51.273' N
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165° 48.41502' W
map
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Show Degrees Minutes |
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Foreign Clearance Required? |
No |
Coastal States:
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 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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Barrow, AK, USA |
Dutch Harbor, AK, USA |
Seattle, WA, USA |
Explanation/justification for requested
ports and dates of intermediate stops
or to list additional port stops |
Request Dutch Harbor to facilitate loading MCS equipment and other gear as well as boarding the science party. Request stop in Nome to debark science party while Healy is en route South. If another cruise follows, Barrow is acceptable for debarking. Assume this late season cruise will be demobilized in Seattle, after USCG Healy returns home. |
Important Info on Working in Foreign Ports
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Chief Scientist: |
Bernard Coakley, UAF_G&G |
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# in Science Party |
20 |
# of different science teams |
1 |
# Marine Technicians to be
provided by ship operator:
(include in science party total)
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3 |
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Explanation of Science Party Requirements and Technician Requirements |
Need technicians to maintain and operate MCS system 7/24 as well as watchstanders, data processors and other cruise participants.
Assume operator provided technicians will be provided by LDEO as for previous cruises to support multi-beam and ship's data logging and by USCG to support on board data acquisition system. |
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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. |
Also request use of on board Bell BGM-3 gravimeter(s) and Knudsen sub-bottom profiler system.
Request dredges on board to sample any basement outcrops imaged in MCS or chirp data.
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Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
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