ХИМИЧЕСКИЙ СОСТАВ И ГЕНЕЗИС ХРОМШПИНЕЛИДОВ ИЗ УЛЬТРАМАФИТОВ ГУЛИНСКОГО МАССИВА (МАЙМЕЧА-КОТУЙСКАЯ ПРОВИНЦИЯ)

Abstract

On the base of wide material several varieties of chromspinelides are revealed within ultramafitcs of the Gulinsky volcano-plutonic massif. Their mineralogical features are indicated in the paper, including the data on chemical composition according to X-ray spectroscopy and crystallochemical formula. Chromspinelides from Gulinsky dunites are enriched with Ti (up to 10.17 % wt) and Fe (up to 55.89 % FeO) comparing to chromite of similar Pt-bearing massives. With clinopyroxenization of dunites Ti and Fe contents increase further more. Presence of iridosmine and native osmium with ferrichromites in placers of the Gulinsky area indicates for strict relation between formation of PGE minerals and segregation of chromspinelides.