IMMISCIBILITY OF SILICATE AND SALT (Li, Na, F) MELTS IN COMENDITE AT THE ZAART KHUDAG ORE OCCURRENCE, CENTRAL MONGOLIA: EVIDENCE FROM MELT INCLUSIONS

Abstract

The continental rift-related magmatism is characterized by abundant rocks of elevated alkalinity and bimodal igneous associations with predominance of alternating basic and silicic rocks. The alkaline felsic rocks, including alkali granite and comendite, pantellerite, and trachyte as its volcanic equivalents, often contain diverse rare-metal and rare-earth mineralizations (REE, Zr, Nb, Ta, Li, Be, and others) that attain economic importance in some cases. Although rift-related bimodal magmatism is widespread in central Asia, the information on the composition and physicochemical parameters of such magmas is obviously insufficient.