Chromite Mineralization in the Sopcheozero Deposit (Monchegorsk Layered Intrusion, Fennoscandian Shield)

In 1990, the Sopcheozero Cr deposit was discovered in Monchegorsk Paleoproterozoic layered mafic-ultramafic intrusion (Monchepluton). This stratiform early-magmatic occurs middle part of Dunite Block, which is a member Monchepluton series. The Cr2O3 average-weighted content ordinary and rich ores 16.65 38.76 wt.%, respectively, at gradually changing concentrations within rich, poor ore types body general. deposit, having ratio Cr2O3/FeOtotal = 0.9–1.7, can serve as raw materials for refractory chemical industries. Cr-spinel (magnochromite magnoalumochromite) associated with highly magnesian olivine (96–98 Fo) Ni (0.4–1.1 wt.%). It confirms low S melt complies oxygen fugacity. coexisting Cr-spinel-olivine pairs crystallized temperatures from 1258 to 1163 °C, accessory crystallizing relatively low, while higher temperatures. host rock distinguish widespread plastic deformations postcrystallization phase under conditions high temperature (above 400 °C) pressure (5 kbar). At post magmatic Svecofennian stage (1.84 Ga), jointly Monchepluton, subject diverse tectonic deformations.