ERSHOVA, Victoria, Institute of Earth Sciences, Saint Petersburg State University, University emb. 7-9, Saint Petersburg, 199034, PROKOPIEV, Andrei, Diamond and Precious Metal Geology Institute, Russian Academy of Sciences, 39 Lenin Avenue, Yakutsk, 677891, Russia, ANFINSON, Owen, Geology, Sonoma State University, Rohnert Park, CA 94928, KHUDOLEY, Andrey, Regional geology, Saint Petersburg State University, University emb. 7-9, Saint Petersburg, 199034, STOCKLI, Daniel F., Jackson School of Geosciences, The University of Texas at Austin, 2305 Speedway, Stop C1160, Austin, TX 78712, FALEIDE, Jan Inge, Department of Geosciences, University of Oslo, Oslo, 1047, Norway and GAINA, Carmen, Centre for Earth Evolution and Dynamics (CEED), University of Oslo, PO Box 1048, Blindern, Oslo, 0316, Norway, v.ershova@spbu.ru