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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
Awards in reverse chronological order after start
date (most recent first):
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Determination of Volcanic Flux Rates and Application to Understanding
Regional Geochemical Trends and Element Mass Balances in Central America
| MARGINS Focus Area |
Subduction
Factory, Seismogenic
Zone |
| NSF Org |
EAR |
| Latest Amendment Date |
May 16, 2002 |
| Award Number |
0203388 |
| Award Instrument |
Standard Grant |
| Program Manager |
David Fountain
EAR DIVISION OF EARTH SCIENCES
GEO DIRECTORATE FOR GEOSCIENCES |
| Start Date |
July 1, 2002 |
| Expires |
June 30, 2004 (Estimated) |
| Expected Total Amount |
$175,398 (Estimated) |
| Investigator |
Michael J. Carr (Principal
Investigator current)
Carl C. Swisher (Co-Principal Investigator current)
Mark D. Feigenson (Co-Principal Investigator current) |
| Sponsor |
Rutgers Univ New Brunswick
ASB III, 3 Rutgers Plaza
New Brunswick, NJ 08901 |
| NSF Program |
1574 GEOPHYSICS |
| Field Application |
0000099 Other Applications NEC |
| Abstract |
Several important questions about the nature of the subduction
process require a transition from existing qualitative subduction
signals, such as Ba/La and 10Be/9Be, to quantitative fluxes such
as Ba flux in gm/unit arc length/yr. This is accomplished by employing
40Ar/39Ar dating techniques to measure the ages of the older units
in several large Central American volcanic centers. These new data,
along with previously determined volume measurements, enable the
determination of average volcanic flux rates for different segments
of the arc. Integrating volcanic flux rates with regional geochemical
data allows an estimate of element fluxes to be made. From these
integrated data several major problems are being addressed, including
the physical cause of along-strike variations in subduction signal
in Central America, the mass balance of elements cycling through
the Central American arc, and the quantity of incompatible elements
that are delivered to the deep mantle through subduction. |
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