Formation of Granitoids of Caucasus Mineral Waters: Evidence from Study of Melt and Fluid Inclusions in Minerals

摘要

(1) Granitoids crystallized from fluid-saturated magmas overheated up to a temperature of >1280℃. (2) A magmatic chamber was common during crystallization of phenocrysts. Zircons, apatite, titanite, and pyroxene crystallized in the chamber of magma generation at a temperature of ～ 1280℃ and a pressure of >5 kbar. Magma intrusion was accompanied by intense degassing and crystallization of phenocrysts of amphibole, plagioclase, biotite, and magnetite at 1010-950℃ and pressure decrease to 2.5-3 kbar. The fluid separated from magma in the course of intrusion and degassing was alkaline, enriched in Na and K chlorides.