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Marion Rise
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2019
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Thomas G. Thompson
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Project Title: |
Collabortive Research: Thin Crust Over the Marion Rise: Remelting the Gondwanan Mantle |
Project Status: |
Submitted |
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Principal Investigator: |
Henry J. Dick, WHOI |
Project Institution: |
WHOI |
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Project ID: |
105465 |
Version #: |
4 |
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Date Submitted: |
8/10/2016 11:08:00 AM |
Created By: |
Henry J. Dick |
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Date Last Modified: |
4/19/2019 9:14:00 AM |
URI Serial #: |
None |
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Funding Agencies: |
NSF/OCE/MGG - 1657983 - Funded |
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Summary of Field Work: |
This proposal is for a cruise to the Marion Platform at the crest of the Marion Rise on the SW Indian Ridge to test the hypothesis that it is supported by lateral heterogeneity produced by recycling different Gondwana mantle provinces; reflecting the pre-breakup lateral transition from Archaean Cratonic lithosphere to the west, to the Proterozoic East African Orogenic Belt (EAO) to the east. This is Leg 1, of a two Leg international program to study the platform, which extends from the Andrew Bain FZ ~2,000 km to the Gallieni FZ. Despite extreme controversial isotopic variability, this region is poorly surveyed, with potentially large exposed mantle domains (>1,000-km2), contrary to the accepted paradigm that rises are due to ridge-plume interaction and thick crust. Leg 1 will map and sample 2 key areas (39°-41.5°E & 43°-46°E) with high potential for exposed mantle and thin crust. 9.5 days of gravity, magnetics, and bathymetric surveys, and 14 days dredging will delineate mantle domains and major magmatic centers with extensive off-axis dredging. Funded German Leg 2 on RV Sonne includes expanded dredging and mapping to fill additional survey gaps, as well as ROV sampling and magnetics surveys of key areas. This will provide a basis for future seismic surveys. Post-cruise research includes petrographic, isotopic and major and trace element analysis of basalt and peridotite to determine the nature and origin of the mantle source and how it. Calculation of the mantle RMBA with the geochemically determined mantle density gradient will estimate the extent of serpentinization. This with the magnetization, dredging and bathymetry will be used to make a geologic map and interpret the tectonic evolution and crustal architecture of the Platform. |
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Summary of Facility Requirements: |
Magnetometer, gravimeter, multibeam, rock dredges. Cruise will have ~10 days of surveying ridge with co-registered bathymetry, magnetics, and gravity |
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Summary of other requirements and comments: |
none |
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Type of Request: |
Primary Ship Use |
Request Status: |
Submitted |
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Request ID: |
1008843 |
Created By: |
Henry J. Dick |
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Date Last Modified: |
4/19/2019 9:14:00 AM |
Date Submitted: |
8/10/2016 11:08:00 AM |
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Year: |
2019
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Ship/Facility: |
Thomas G. Thompson
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Optimum Start Date:
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1/4/2019 |
Dates to Avoid: |
Need Austral Summer working at high southern latitudes between 39° and 44°S |
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Earliest Start Date: |
10/16/2018 |
Multi-Ship Op: |
No |
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Latest Start Date: |
3/1/2019 |
Other Ship(s): |
NA |
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Operating Days Needed: |
Science Days |
Mob Days |
De-Mob Days |
Estimated Transit Days |
Total Days |
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24 |
2 |
1 |
9 |
36 |
Repeating Cruise?
(within same year) |
No |
Interval: |
0 |
# of Cruises: |
1 |
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Description of Repeating cruise requirements: |
NA |
Justification/Explanation for ship choice, dates,
conflicts, number of days & multi-ship operations: |
Need Austral summer due to weathering |
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Short Description of Op Area
for use in schedules: |
Marion Rise |
| Description of Op Area: |
SW Indian Ridge between 39° & 46°E on the Marion Rise |
| Op Area Size/Dia.: |
450 by 90 |
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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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38° 30' S
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46° 42' E
map
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Show Degrees Minutes |
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Foreign Clearance Required? |
No |
Coastal States:
NONE |
 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.) |
NA |
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Requested Start Port |
Intermediate Port(s) |
Requested End Port |
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Cape Town, South Africa |
None, |
Durban, South Africa |
Explanation/justification for requested
ports and dates of intermediate stops
or to list additional port stops |
Closest ports to work area |
Important Info on Working in Foreign Ports
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Chief Scientist: |
Henry J. Dick, WHOI |
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# in Science Party |
26 |
# of different science teams |
1 |
# Marine Technicians to be
provided by ship operator:
(include in science party total)
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2 |
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Explanation of Science Party Requirements and Technician Requirements |
Need technicians to run magnetometer, gravimeter and seabeam systems, and run dredging operation, |
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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. |
need good coring winch with 90-m/min hauling and deploying speed
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Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
This request is for the use of SENTRY on an NSF Funded cruise to the Marion Rise with separate funding provided through the Woods Hole Oceanographic Institution to do high resolution mapping, magnetics, and side-scan on the SW Indian Ridge mapping the rift valley floor and adjacent rift mountains.
Summary of Facility Requirements: AUV SENTRY |
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