Abstract
The Kalgan ophiolite massif is a unit of the ophiolite association of the Chersky collision belt. It is part of the Verkhoyano-Kolyma folded system on Northeast Asia. The Kalgan massif includes a complex of mantle peridotites, a lower-crust complex represented by ultrabasic cumulates, cumulative gabbro-amphibolites and amphibolites, and an upper-crust complex represented by metabasalts. New geochemical data obtained by the ICP-MS method, as well as data on the isotopic composition (Sm, Nd), made it possible to significantly clarify the geodynamic conditions for the formation of volcanites and to determine the features of the sources of parent melts.
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