PROGNOSTIC ESTIMATE OF NOBLEMETAL RESOURCES IN PROMISING ORE DISTRICTS OF THE KARELIAN REGION

Abstract

The gold and platinoid resources of the Karelian region are expected to increase. Our prediction is based on the leading genetic types of noble-metal mineralization known in the region such as the low-sulphide Pt-Pd type in layered plutons and gabbro-dolerites, CuU-Mo-V-Pt-Pd-Au polygenic Padma type, orogenic mesothermal gold type and complex gold-porphyry type, as well as new types not reported earlier such as stratiform black shale type, iron oxide type with copper and gold (IOCG) and Rompas gold-uranium type. Noble-metal mineralization in the metapyroxenites of the Kaalamo and Välimäki igneous complexes, Latvasyrja aposkarn metasomatic rocks in Priladozhye (Lake Ladoga area) and Zaonezhye (Trans-Onega) black shales are described briefly mineralogically and geochemically. The mineralogical and geochemical indicators of noble-metal ore formation in Karelia’s Paleoproterozoic trapps, tested at the Pudozhgorsky igneous complex and the Chinozero sill, are identified. Variations in the PT-parameters of ore formation in the Koikary-Vygozero shear zone are interpreted as a reliable criterion for its predictive metallogeny evaluation for orogenic gold.

Keywords

• докембрий
• карелия
• золото
• платина
• палладий
• мало- сульфидный pt-pd тип оруденения
• расслоенные плутоны
• габбродолериты
• пудожгорское месторождение
• орогенное мезотермальное золото
• сдвиговые зоны