NSF Award Abstract - #9521023

Dynamics of Extensional Convergent Margins and the Origin of Supra-Subduction Zone Ophiolites: Hypothesis Testing in the Tonga Forearc

NSF Org OCE
Latest Amendment Date February 14, 1996
Award Number 9521023
Award Instr. Standard Grant
Prgm Manager Bruce T. Malfait
OCE DIVISION OF OCEAN SCIENCES
GEO DIRECTORATE FOR GEOSCIENCES
Start Date February 15, 1996
Expires August 31, 1999 (Estimated)
Expected Total Amt. $429,205 (Estimated)
Investigator Sherman H Bloomer bloomers@bcc.orst.edu
Dawn J Wright
Sponsor Oregon State University
Corvallis, OR 973315503 503/754-0123
NSF Program 5720 OCEAN DRILLING PROGRAM
Fld Applictn 0204000 Oceanography

Abstract

9521023 This project by Drs. Sherman Bloomer and Dawn Wright of Oregon State University supports a research cruise and subsequent data analysis aimed at understanding the development of the Tonga subduction system in the southwestern Pacific. This convergent margin is hypothesized to represent a simple end-member of such subduction systems, where rapid convergence and a simple plate margin geometry allow testing of a series of hypotheses regarding geologic evolution of the "forearc" system. The program will include detailed seafloor imaging to study fault distribution, geophysical studies (seismic reflection, gravity and magnetics) to examine subsurface architecture, and extensive rock sampling to examine the development of the arc system geochemically. Of particular interest will be the distribution of serpentinite diapirs and evidence of hydrothermal fluid migration in the arc system.

This project is supported in collaboration with award 9521039 to Dr. Dawn Wright, whose support comes under the NSF Faculty Early Career Development (CAREER) Program. That award provides support for Dr. Wright over four years to develop new, interdisciplinary courses in the marine and geological sciences, to promote scientific careers to undergraduate and high school students, and to carry out a two-pronged research program in different aspects of marine geophysics. The first part of the proposed research focusses on the study of the geophysical development of the Tonga forearc, and Dr. Wright will participate in the field program, and will have principal responsibility for post-cruise analysis of the geophysical data collected during the project.


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