1 Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, University Station, Box X, Austin, TX, 78713-8924, USA. juan.soto@beg.utexas.edu.
2 Departamento de GeodinĂ¡mica, Universidad de Granada, Avenida de Fuente Nueva s/n, 18071, Granada, Spain. juan.soto@beg.utexas.edu.
3 Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, University Station, Box X, Austin, TX, 78713-8924, USA.