Netherlands Centre for Integrated Solid Earth Sciences, Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, Amsterdam, 1081 HV Netherlands
University of Bucharest, Department of Geology and Geophysics, University of Bucharest, Traian Vuia Street 6, Bucharest 1, 70139 Romania
Uppsala University, Department of Earth Sciences, Uppsala University, Villavagen 16, Uppsala, 752 36 Sweden