1. 1Department of Earth and Environmental Sciences, 115 Trowbridge Hall, University of Iowa, Iowa City, Iowa 52242, USA
2. 2Faculty of Geology, Geophysics and Environmental Protection, AGH University of Kraków, al. Mickiewicza 30, 30-059 Kraków, Poland
3. 3Department of Earth Sciences, Dartmouth College, HB6105 Fairchild Hall, Hanover, New Hampshire 03755, USA
4. 4Department of Earth Sciences, Memorial University of Newfoundland, 9 Arctic Avenue, St. John’s, Newfoundland A1B 3X5, Canada
5. 5Department of Geological Sciences, Stockholm University, Svante Arrhenius väg 8, 114 18 Stockholm, Sweden