MINERALOGICAL AND GEOCHEMICAL CRITERIA OF NI ENRICHMENT OF DUNITE-TROCTOLITE INTRUSIONS OF NJURUNDUKAN SERIES IN NORTHERN BAIKAL REGION

Geochemical data in concern with petrogenic and rare elements as well as rockforming mineral chemical composition of dunite-troctolite intru sive associations of Njurundukan series are presented. The decrease of Ca-content in plagioclases coupled with the increase of iron-content in pyroxenes of studied rocks is established in SW lateral direction f rom Tchajsky to Sljudinsky massives. Some intrusive massives have nont rivial mineralogical peculiarities as following: iron content of femic minerals of latest stages of mineral formation are found to by minera l. High Mg-content of ol vines and pyroxenes is considered as a criter ium of ore-bearing magmatic bodies.