[1
]Department of Geosciences, 322 Natural Resources Building, Colorado State University,
Ft. Collins, CO 80523-1482, USA.
[2
]Geological Survey of Norway, Leiv Erikssons Vei 39, N-7491 Trondheim, Norway.
[3
]Institut für Geologie, TU Bergakademie Freiberg, Bernhard-von-Cotta-Str. 2, D-09599
Freiberg, Germany.
[4
]Fachbereich Geowissenschaften, Universität Bremen, Postfach 330 440, D-28334 Bremen,
Germany.
[5
]Centro de Geosciencias (CGEO), Universidad Nacional Autónoma de México (UNAM), Campus
Juriquilla, Blvd Juriquilla 3001, 76230, Querétaro, México.