| NSF Org: |
EAR Division Of Earth Sciences |
| Recipient: |
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| Initial Amendment Date: | November 7, 2005 |
| Latest Amendment Date: | January 7, 2010 |
| Award Number: | 0537068 |
| Award Instrument: | Continuing Grant |
| Program Manager: |
Sonia Esperanca
EAR Division Of Earth Sciences GEO Directorate for Geosciences |
| Start Date: | January 1, 2006 |
| End Date: | June 30, 2010 (Estimated) |
| Total Intended Award Amount: | $269,190.00 |
| Total Awarded Amount to Date: | $269,190.00 |
| Funds Obligated to Date: |
FY 2007 = $92,296.00 FY 2008 = $108,179.00 |
| History of Investigator: |
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| Recipient Sponsored Research Office: |
1109 GEDDES AVE STE 3300 ANN ARBOR MI US 48109-1015 (734)763-6438 |
| Sponsor Congressional District: |
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| Primary Place of Performance: |
1109 GEDDES AVE STE 3300 ANN ARBOR MI US 48109-1015 |
| 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): | Petrology and Geochemistry |
| Primary Program Source: |
app-0107 01000809DB NSF RESEARCH & RELATED ACTIVIT |
| 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
Funding is requested to measure the low-temperature heat capacities of selected high-pressure mantle silicates. Heat capacity is a fundamental thermodynamic parameter that until recently has been impossible to measure at low temperatures on small volumes of synthetic material. Synthesis of the desired mineral phases will be conducted in a multi-anvil apparatus and low-temperature heat capacity measurements will be conducted with a Physical Properties Measurement System. Heat capacity measurements will be carried out on several mantle phases, including high-pressure polymorphs of olivine and feldspar. These measurements will allow generation of the Gibbs free energies of these and associated phases from the extant enthalpy measurements and/or experimental phase equilibria. Results of this study are expected to shed light on the stability of assemblages in the mantle and will allow calculation of new phase diagrams for high-pressure rocks that are metamorphosed during subduction and continental collision. A deeper understanding of the increasing number of rocks known to have reached ultrahigh pressures and returned to the surface during mountain-building events or explosive volcanic action requires the evaluation of new reactions, to which this study will contribute materially.
This work contributes to a broader understanding of fundamental tectonic processes in the deep Earth. Previous studies of mantle assemblages have been based on many simplifications, including relatively simple compositions. Systems of expanded composition more closely represent the real mantle and the volcanic rocks that are generated there. Future study of such complex systems is dependent on a thorough knowledge of the thermodynamics and phase equilibria of important mantle minerals including those explored in this proposal. The phase equilibria provide important constraints on the structure and dynamics of the mantle, which is the source for the great majority of volcanic rocks and for many major earthquakes.
PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH
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