APATITE-ALBITE METASOMATITES (ACEITES) OF THE EASTERN ALDAN-STANOVOY SHIELD

The paper summarizes the findings of research on Riphean ore-bearing apatite-albite metasomatites (aceites) identified in metamorphic, volcanic and intrusive rocks in the eastern Aldan-Stanovoy shield. The characteristic features of lithological and structural control of aceites, their mineral and petrochemical composition, geochemical associations, ontogeny, metasomatic zoning, and geochemical specialization are outlined. Aceites in metamorphic rocks are assigned to the albite-chlorite-apatite facies and in igneous rocks to the albite-apatite facies. Apatite-albite metasomatites host mineralization of two types: uranium (in aceites after metamorphic rocks) and uranium – rare earth element – rare metal (in aceites after volcanic and intrusive rocks).

Metasomatic zoning and antimony mineralization on the area “SOUTHERN” (Shilkinsky District Transbaikalia)

The article summarizes the material on the results of the study of ore-bearing metasomatically altered rocks. A complex mineralogical-structural approach is used, including the results of studying extensive literature, authorial macro and microscopic data, and the results of X-ray structural analysis. The typification of metasomatically altered rocks is shown, a metasomatic column is constructed and conclusions are drawn regarding hydrothermal-metasomatic processes associated with unloading of endogenous energy and redistribution of matter flows in the upper part of the earth's crust.