|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
This site is maintained by the MARGINS Office. Please share your comments and suggestions with us.
|
|
|
Browse MARGINS-related
awards in reverse chronological order after start
date (most recent first):
|
|
|
 |
Devolatilization and Trace Element Mobility During Subduction-Zone
Metamorphism: Record in Alpine Blueschist-Eclogite Suites
| MARGINS Focus Area |
Subduction Factory |
| NSF Org |
EAR |
| Latest Amendment Date |
January 15, 2002 |
| Award Number |
0079331 |
| Award Instrument |
Standard Grant |
| Program Manager |
Glen S. Mattioli
EAR DIVISION OF EARTH SCIENCES
GEO DIRECTORATE FOR GEOSCIENCES |
| Start Date |
September 1, 2000 |
| Expires |
July 31, 2003 (Estimated) |
| Expected Total Amount |
$177,088 (Estimated) |
| Investigator |
Gray E. Bebout (Principal
Investigator current) |
| Sponsor |
Lehigh University
Alumni Building 27
Bethlehem, PA 18015 |
| NSF Program |
1573 PETROLOGY AND GEOCHEMISTRY |
| Field Application |
0000099 Other Applications NEC |
| Abstract |
The effects of subduction-zone metamorphism on the chemical and
isotopic compositions of oceanic crust and sediments subducted into
the mantle have not been adequately considered in models of ocean-atmosphere-mantle
geochemical cycling. In the research funded by this grant, the P.I.
and his students will evaluate the nature of these effects through
combined field and geochemical study of fluid loss and chemical
alteration in metamorphic rocks in the Italian Alps thought to have
been subducted to 50-120 km depths. The two specific field localities
include a well-studied traverse of variably metamorphosed shales
and carbonate rocks exposed in the Cottian Alps, and exposures of
metamorphosed oceanic crustal rocks (and their overlying sediment
cover) in the Valtournenche area. These localities are well-suited
because of their particularly well-preserved metamorphic mineral
assemblages and chemical compositions representing the effects of
deep subduction. In addition, the lithologies at the two localities
are representative of those thought to contribute geochemically
to the production of arc lavas, and the carbonate-rich metasedimentary
sections will afford insight into the decarbonation history of similar
sections in modern subduction zones such as the Central America
and Banda arc-trench systems. This planned study of devolatilization
based on subduction-zone metamorphic suites will contribute to our
knowledge of the cycling of volatiles such as carbon dioxide and
nitrogen between Earth's oceans/atmosphere and mantle (information
important in models of long- and short-term atmosphere evolution).
|
|
