*Joachim Jacobs¹、Andreas Läufer²、Marlina A. Elburg³、Birgitte Opås¹、Antonia Ruppel²、Graeme Eagles⁴ (1.Department of Earth Science, University of Bergen & Norwegian Polar Institute, Norway、2.Federal Institute for Geosciences and Natural Resources (BGR), Hannover, Germany、3.Department of Geology, University of Johannesburg, South Africa、4.Alfred-Wegener-Institute for Polar and Marine Research, Bremerhaven, Germany)