1. 1German Research Centre for Geosciences (GFZ), Telegrafenberg, D-14473 Potsdam, Germany
2. 2Department of Geology, TU Bergakademie Freiberg, B.-v.-Cotta-Strasse 2, D-09596 Freiberg, Germany
3. 3BEAK Consultants GmbH, Am St. Niclas Schacht 13, D-09599 Freiberg, Germany