DEFINITION OF METAMORPHISM THERMODYNAMIC CONDITIONS FOR ARMENIAN PRECAMBRIAN KASAKH SUITE BY AMPHIBOLE THERMOBAROMETER
DOI:
https://doi.org/10.46991/PYSU:C/2011.45.3.003Keywords:
Precambrian Kasakh suite, green-schist facies, prograde magneziohornblende-tchermakite, retrograde magnezio-hornblende-actinolite zonation, primary-magmatic hornblendeAbstract
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 Precambrian Kasakh suite. The general trend of metamorphism has been defined in the average amphibolite and green-schist facies in ranges Т=420–640℃ and P=1,6–5,7 kbr of low geothermal gradient of 12℃/km. Prograde magneziohornblende-tchermakite and retrograde magnezio-hornblende-actinolite zonation has been revealed, and also relics of kersutite have been found. Relics of kersutite are preserved from primary-magmatic hornblende of the initial basalts.
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