|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
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):
|
|
|
 |
Catastrophic Slab De-Watering Event in the Pliocene Western Pacific:
Evidence from the Tephra Record of the Japan and Bonin Forearcs
| MARGINS Focus Area |
Subduction Factory |
| NSF Org |
OCE |
| Latest Amendment Date |
March 15, 2001 |
| Award Number |
0096363 |
| Award Instrument |
Continuing grant |
| Program Manager |
Rodey Batiza
OCE DIVISION OF OCEAN SCIENCES
GEO DIRECTORATE FOR GEOSCIENCES |
| Start Date |
March 15, 2001 |
| Expires |
March 31, 2003 (Estimated) |
| Expected Total Amount |
$82,217 (Estimated) |
| Investigator |
Peter D. Clift (Principal
Investigator current)
Nobumichi Shimizu (Co-Principal Investigator current) |
| Sponsor |
Woods Hole Ocean Inst
Woods Hole, MA 02543 |
| NSF Program |
1620 MARINE GEOLOGY AND GEOPHYSICS |
| Field Application |
0204000 Oceanography |
| Abstract |
Glass shards in ash layers from ODP cores show that the Marianas
and Tonga arcs produced magmas with high B/Be simultaneously at
3-4Ma. High values of B/Be are thought to be due to a high proportion
of slab-derived fluid. This proposal is to analyze more glass shards
from new areas, Bonin and Japan, to determine whether this high
B/Be is also present in these areas at 3-4 Ma. These new analyses
will help determine whether the high B/Be signal is regional or
local and also to evaluate the unlikely possibility that the high
B/Be is secondary (due to alteration). This study will also indirectly
shed light on whether slab volatile flux is mostly controlled by
convergence rate and not other factors like the type and amount
of sediment that is being subducted. |
|
