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This site is maintained by the MARGINS Office. Please share your comments and suggestions with us.
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Browse MARGINS-related
awards in reverse chronological order after start
date (most recent first):
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Volcanic Processes in Subduction Zone Magmas: Composition, Abundance,
and Role of C-O-H-S Volatiles
| MARGINS Focus Area |
Subduction Factory |
| NSF Org |
EAR |
| Latest Amendment Date |
July 15, 2000 |
| Award Number |
0073771 |
| Award Instrument |
Standard Grant |
| Program Manager |
Sonia Esperanca
EAR DIVISION OF EARTH SCIENCES
GEO DIRECTORATE FOR GEOSCIENCES |
| Start Date |
July 1, 2000 |
| Expires |
June 30, 2003 (Estimated) |
| Expected Total Amount |
$210,000 (Estimated) |
| Investigator |
Malcolm J. Rutherford (Principal
Investigator current) |
| Sponsor |
Brown University
164 Angell Street
Providence, RI 02912 |
| NSF Program |
1573 PETROLOGY AND GEOCHEMISTRY |
| Field Application |
0000099 Other Applications NEC |
| Abstract |
This proposal involves three projects, all directed at developing
a more complete understanding of how the magmatic processes such
as magma mixing, crystallization, crystal-melt separation, and degassing
occur in gas-rich, subduction zone volcanic systems. The tasks involve
a range of analytical work (i.e., electron microprobe, ion-probe,
F.T.I.R spectroscopy) on samples collected during field study, and
on samples prepared experimentally under controlled P, T, and fO2,
conditions. The first project is an investigation of the 1912 eruption
of Mt. Katmai where three compositionally distinct magmas were erupted
in a single event. The study is simultaneously an investigation
of magma mixing processes, and a test of the zoned magma storage
region hypothesis proposed by Hildreth. The second task is one in
which fundamental data will be obtained on the composition of volcanic
gases as a function of P, T, fO2, and the composition of coexisting
crystals and melt. This study will consider CO2-H2O-S composition
gas phases. The third project is a study of the volcanic eruptions
which occurred almost simultaneously at Black Butte and adjacent
Mount Shasta in California. The objective of this work is to determine
the pre-eruption magma condition for the two eruptions, and to develop
an expression relating magmatic conditions and the compositions
of coexisting plagioclase and hornblende which are prominent phases
in these eruptions. |
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