1. Department of Earth Science; Centre for Geobiology; University of Bergen; Bergen Norway
2. Department of Geology; University of Johannesburg; Johannesburg South Africa
3. Institut für Geologie und Paläontologie; Westfälische Wilhelms-Universität Münster; Münster Germany
4. Centre for Environmental Remediation; Institute of Geographic Sciences and Natural Resources Research; Chinese Academy of Sciences; Beijing China
5. Institut für Mineralogie; Westfälische Wilhelms-Universität Münster; Münster Germany