A fundamental problem in tectonics is the uplift and exhumation of metamorphic rocks within convergent wedges. Of particular interest are the relative roles of erosion versus tectonic thinning, where thinning can occur by normal faulting and/or ductile flow. This project will measure finite deformation across the Otago culmination in order to understand how erosion and within-wedge ductile flow contribute to exhumation of the wedge. The Otago culmination marks the forearc high of the Torlesse accretionary wedge of New Zealand, and has been well-studied. The rocks are preserved beneath a middle Cretaceous peneplain and a thin cover of younger strata which provides a datum for identifying effects of younger deformation. The pattern of finite strain over the region, along with information about volume strains will be used to resolve middle Cretaceous uplift and erosion rates for the forearc high. These results will provide a useful model for comparison to other convergent margin situation.

Agency
National Science Foundation (NSF)
Institute
Division of Earth Sciences (EAR)
Type
Standard Grant (Standard)
Application #
9814807
Program Officer
Arthur G. Goldstein
Project Start
Project End
Budget Start
1999-03-01
Budget End
2002-02-28
Support Year
Fiscal Year
1998
Total Cost
$136,783
Indirect Cost
Name
Yale University
Department
Type
DUNS #
City
New Haven
State
CT
Country
United States
Zip Code
06520