Sopcha Lake Chromite Deposit and Its Platinum Potential,
Monchegorsk Pluton, Kola Peninsula (Russia)

V. V. Chashchin*, A. S. Galkin**, V. V. Ozeryanskii**, and A. N. Dedyukhin**

* OAO “Tsentral’no-Kol’skaya Ekspeditsiya,” Komsomol’skaya ul. 23, Monchegorsk, Murmansk oblast, 184280 Russia
** AO “Kombinat Severonikel’” of the Concern “Noril’skii Nikel,” Monchegorsk-7, Murmansk oblast, 184280 Russia

Received April 14, 1999

Abstract—A chromium deposit was found in the southwestern part of the Monchegorsk nickel-bearing pluton.
The sheet-shaped chromite lode is confined to dunites located in the middle part of the section of the Monche-
gorsk Pluton. The dunites and chromite ores exhibit elevated platinum-group element (PGE) concentrations.
There is a positive correlation of Pt and Pd with S and Rh with Cr. The origin of the chromite horizon with ele-
vated PGE contents is accounted for the mixing of two magmas: (1) a highly evolved magma with crystallizing
plagioclase, and (2) a new portion of primitive magma bearing sulfides enriched in PGE. Both magmas were
derived from the same intermediate magma chamber.

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