Aglaja Blanke^1,2, Grzegorz Kwiatek^1,2, Thomas Goebel³, Marco Bohnhoff^1,2 and Georg H Dresen^1,4, (1)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, (2)Free University Berlin, Institute of Geological Sciences, Berlin, Germany, (3)University of California, Santa Cruz, Earth and Planetary Sciences, Santa Cruz, CA, United States, (4)University of Potsdam, Institute of Geosciences, Potsdam, Germany