Opredelenie termodinamicheskikh uslovii metamorfizma Kasakhskoj Svity dokembriya armenii po amfibolovomu termobarometru

Armenian Precambrian basement rocks metamorphism P and T conditions are defined applying amphibole thermobarometer by means of 104 amphibole microprobe chemical analyses. Measurements have been done on 2 samples of ophiolitic metabasalte amphibolites of the Precambian Kasakh suite. The general trend of metamorphism has been defined in the average amphibolite and green-schist facies in ranges T=420-640°C and P=1,6-5,7 kbar of low geothermal gradient of 12°C/km. Prograde megnesiohornblende-tschermakite and retrograde megnesiohornblende-actinolite zonation has been revealed, and also relics of kaersutite have been found. Relics of kaersutite are preserved from primary magmatic hornblende of the initial basalts