1. Academy of Sciences, Humanities, and Literature, 53151 Mainz, Germany.
2. Leibniz Institute of Marine Sciences (IFM-GEOMAR), 24148 Kiel, Germany.
3. Department of Geology, University of Tromsø, 9037 Tromsø, Norway.
4. Alfred Wegener Institute of Polar and Marine Research, 27515 Bremerhaven, Germany.
5. Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309, USA.