1. Department of Earth and Planetary Science, University of California, 307 McCone Hall, Berkeley, CA 94720, USA
2. Universidad Nacional San Antonio Abad del Cusco UNSAAC, Avenida de la Cultura 733, Cusco, Peru
3. Department of Earth Sciences, University of California, 2111 Webb Hall, Santa Barbara, CA 93106, USA
4. Department of Geosciences, Boise State University, 1910 University Drive, MS 1535, Boise, ID 83725, USA