Several types of geophysical observations indicate that the lithosphere in the southcentral Pacific is undergoing diffuse north-south extension. As a partial test of this hypothesis, the Principle Investigator will survey a previously uncharted series of en-echelon ridges that extend for 2500 km from the East Pacific Rise to the northern edge of the Tuamotu archipelago. A major implication of the stretching hypothesis is that some volcanic activity in the west Pacific may be related to tensional failure of the lithosphere rather than numerous mantle plumes. The goals of the survey are to first establish that the ridges exist where they have not been charted, and that they are continuous. The ridges will also be dredged for petrologic and age studies, and the magnetic signature of the ridges will be determined.

Agency
National Science Foundation (NSF)
Institute
Division of Ocean Sciences (OCE)
Application #
9311332
Program Officer
Bilal U. Haq
Project Start
Project End
Budget Start
1993-04-15
Budget End
1996-03-31
Support Year
Fiscal Year
1993
Total Cost
$46,311
Indirect Cost
Name
University of Miami Rosenstiel School of Marine&Atmospheric Sci
Department
Type
DUNS #
City
Key Biscayne
State
FL
Country
United States
Zip Code
33149