1 Department of Geology and Environmental Science, University of Pittsburgh, Pittsburgh, PA, USA.
2 Department of Geology and Environmental Science, University of Pittsburgh, Pittsburgh, PA, USA. [email protected].
3 Departamento de Química Ambiental, Facultad de Ciencias & Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Universidad Católica de la Santísima Concepción, Casilla 297, Concepción, Chile. [email protected].
4 Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, USA.
5 Centro de Información de Recursos Naturales (CIREN), Santiago, Chile.