Inst. Crust. Studies and Dept. Earth Sci., UCSB, Santa Barbara, CA 93106 United States; Dept. Geol. Sci., University of South Carolina, Columbia, SC 29208 United States
Inst. Crust. Studies and Dept. Earth Sci., UCSB, Santa Barbara, CA 93106 United States
Jet Propulsion Laboratory, Caltech, Pasadena, CA 91109 United States;