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Browse MARGINS
Awards in reverse chronological order after start
date (most recent first):
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Collaborative Research: Magma Generation in the Early Mariana Arc
System Revisited
| MARGINS Focus Area |
Subduction Factory |
| NSF Org |
OCE |
| Latest Amendment Date |
August 31, 2000 |
| Award Number |
0001824 |
| Award Instrument |
Standard Grant |
| Program Manager |
Bilal U. Haq
OCE DIVISION OF OCEAN SCIENCES
GEO DIRECTORATE FOR GEOSCIENCES |
| Start Date |
January 1, 2001 |
| Expires |
December 31, 2003 (Estimated) |
| Expected Total Amount |
$124857 (Estimated) |
| Investigator |
Barry B. Hanan (Principal Investigator current) |
| Sponsor |
San Diego State Univ Fdn
5250 Campanile Drive
San Diego, CA 92182 |
| NSF Program |
1620 MARINE GEOLOGY AND GEOPHYSICS |
| Field Application |
0204000 Oceanography |
| Abstract |
Recommended project is for a comprehensive geochemical and geochronological
examination of Eocene to Miocene volcanism in the southern arc and
backarc of the Izu-Bonin-Marianas (IBM) arc system, tracing its
older development with time. In doing so, the recommended research
will also re-examine well-characterized samples that have been previously
investigated using older, obsolescent anayltical techniques. This
study will examine the changing nature of volcanism in the IBM system,
as it transformed from "boninitic" volcanism associated with subduction
initiation to the more "normal" tholeitic and cal-clkaline arc volcanism
also seen today in the modern volcanic arc and backarc. This study
also will examine the changing nature of the mantle sources during
this transformation, as well as the implications they carry for
tectonic processes during the arc system evolution. Previously sampled
lavas and other volcanic rocks will be supplemented by collection
of new samples during field work on Guam; all of these samples will
be analyzed for major and trace elemental composition, isotopic
composition, and geochronological (40 Ar - 39 Ar) dating using the
latest analytical techniques. |
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