1. Institut für Geologie; Leibniz Universität Hannover; Callinstraße 30 D-30167 Hannover Germany
2. Geological Institute; ETH Zürich; CH-8004 Zürich Switzerland
3. Department of Geosciences; GeoBioTec; University of Aveiro; PT-3810-193 Aveiro Portugal
4. Earth Sciences Department; MARE; University of Coimbra; PT-3030-790 Coimbra Portugal
5. Institute of Earth and Environmental Science; University of Potsdam; K.-Liebknecht-Str. 24 D-14476 Potsdam-Golm Germany