9418437 Giletti A principal goal of this research is to understand the mechanisms and controlling parameters that govern diffusion in minerals, particularly by cations. The focus will continue to be the feldspars, in order to develop a systematic and sufficiently comprehensive body of data. These data will form the basis for a predictive model for cations, including those not studied. The proposed research will include determining the diffusion mechanisms and their controlling factors for cations in feldspars, developing a theoretical basis for predicting diffusion kinetics behavior, continuing to measure the Pb diffusion in monazite and extend it to other minerals such as titanite and rutile, and extending determination of Sr diffusion kinetics to mica, apatite and titanite. The two latter studies are especially important in defining precisely the diffusion behavior of geochronologically important systems so that realistic interpretations of th edata can be made. Most of the analytical data will be determined by ion microprobe.

Agency
National Science Foundation (NSF)
Institute
Division of Earth Sciences (EAR)
Type
Standard Grant (Standard)
Application #
9418437
Program Officer
David Lambert
Project Start
Project End
Budget Start
1995-03-01
Budget End
2000-02-29
Support Year
Fiscal Year
1994
Total Cost
$217,200
Indirect Cost
Name
Brown University
Department
Type
DUNS #
City
Providence
State
RI
Country
United States
Zip Code
02912