1. Institute of Earth Sciences, Heidelberg University, Im Neuenheimer Feld 236, 69120 Heidelberg, Germany
2. Department of Geological Sciences, University of Texas, Austin, Texas 78712, United States
3. Department of Isotope Biogeochemistry, Helmholtz Centre for Environmental Research − UFZ, Permoserstr.15, 04318 Leipzig, Germany
4. Leibniz Institute for Baltic Sea Research Warnemünde, Seestrasse 15, 18119 Rostock, Germany
5. UMR 7156 CNRS Génétique Moléculaire, Génomique, Microbiologie, Université de Strasbourg, 4 allée Konrad Roentgen, 67000 Strasbourg, France
6. Max Planck Institute for Chemistry, Hahn-Meitner-Weg 1, 55128 Mainz, Germany