ISSN 1075-7015, Geology of Ore Deposits, 2009, Vol. 51, No. 6, pp. 456–466. © Pleiades Publishing, Ltd...Zhukova, and Yu. G. Tsekhovskyb a Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry...Geochemistry, Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, 119017 Russia b Geological Institute...Institute, Russian Academy of Sciences, Pyzhevskii per. 7, Moscow, 119017, Russia Received June 6, 2009...Abstract—The Early Cambrian, Middle and Late Devonian, Middle and Late Carboniferous, Permian, Late Triassic–Early |