| NSF Org: |
OCE Division Of Ocean Sciences |
| Recipient: |
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| Initial Amendment Date: | February 20, 2008 |
| Latest Amendment Date: | February 20, 2008 |
| Award Number: | 0751600 |
| Award Instrument: | Standard Grant |
| Program Manager: |
Barbara Ransom
bransom@nsf.gov (703)292-7792 OCE Division Of Ocean Sciences GEO Directorate for Geosciences |
| Start Date: | February 15, 2008 |
| End Date: | January 31, 2012 (Estimated) |
| Total Intended Award Amount: | $345,035.00 |
| Total Awarded Amount to Date: | $345,035.00 |
| Funds Obligated to Date: |
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| History of Investigator: |
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| Recipient Sponsored Research Office: |
1156 HIGH ST SANTA CRUZ CA US 95064-1077 (831)459-5278 |
| Sponsor Congressional District: |
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| Primary Place of Performance: |
1156 HIGH ST SANTA CRUZ CA US 95064-1077 |
| Primary Place of
Performance Congressional District: |
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| Unique Entity Identifier (UEI): |
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| Parent UEI: |
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| NSF Program(s): |
Marine Geology and Geophysics, OCEAN DRILLING PROGRAM |
| Primary Program Source: |
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| Program Reference Code(s): |
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| Program Element Code(s): |
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| Award Agency Code: | 4900 |
| Fund Agency Code: | 4900 |
| Assistance Listing Number(s): | 47.050 |
ABSTRACT
ABSTRACT 0751600 (Gill)
Intellectual Merit: This research examines how the mantle and crust of the Earth evolve from during one ~50 million year cycle of subduction, from initiation to demise, in the absence of pre-existing continental crust. It involves four igneous petrological projects on rocks from the Kermadec-Fiji-Tonga area of the SW Pacific. Test using the geochemical and isotopic signatures of volcanic rocks will be used to answer (1) whether subduction initiation has a characteristic magmatic signature and cause; (2) if magma genesis in the mantle wedge during back-arc rifting evolves from flux-dominated to decompression-dominated melting; and (3) whether geochemical features of primary arc magmatism get passed on to second stage" crust that is continental in character. The geochemical plan includes generation and interpretation of extensive trace element and Nd-Hf-Sr-Pb isotope data. In addition, U/Pb and Ar-Ar ages will be obtained for igneous rocks, and results compared to analogues in the northern hemisphere. The first project focuses on the oldest rocks in Fiji and Tonga. The second focuses on basalts erupted in Fiji during 3-5 Ma, and those in cross-chains and rift basins in the Havre Trough. The third uses the granitic plutons of different ages and compositions in Fiji and includes (U-Th)/He double-dating". One anticipated impact will be to assess the commonality of processes between Earth's two largest and best-studied oceanic arcs: Izu-Marianas, and Kermadec-Fiji-Tonga.
Broader Impacts: All three projects directly complement the NSF-funded island arc and backarc basin research foci in RIDGE2000, MARGINS, and IODP. They also involve international collaboration with scientists in Japan and New Zealand. The project provides education/training opportunities for two graduate students and several undergraduates. Public outreach and dissemination will occur through the MARGINS Education and Outreach program and a well-documented sample collection will be provided to the Smithsonian National Museum of Natural History Islands" collection where it will be curated indefinitely.
PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH
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