DEFINITION OF METAMORPHISM THERMODYNAMIC CONDITIONS FOR ARMENIAN PRECAMBRIAN KASAKH SUITE BY AMPHIBOLE THERMOBAROMETER

Authors

  • V. A. Aghamalyan Institute of Geological Sciences of the NAS of the Republic of Armenia
  • B. Shulz University of Freiberg, Germany
  • A. Renno University of Freiberg, Germany
  • J. Lange University of Freiberg, Germany
  • T. K. Lorsabyan Institute of Geological Sciences of the NAS of the Republic of Armenia

DOI:

https://doi.org/10.46991/PYSU:C/2011.45.3.003

Keywords:

Precambrian Kasakh suite, green-schist facies, prograde magneziohornblende-tchermakite, retrograde magnezio-hornblende-actinolite zonation, primary-magmatic hornblende

Abstract

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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Published

2011-12-09

How to Cite

Aghamalyan, V. A., Shulz, B., Renno, A., Lange, J., & Lorsabyan, T. K. (2011). DEFINITION OF METAMORPHISM THERMODYNAMIC CONDITIONS FOR ARMENIAN PRECAMBRIAN KASAKH SUITE BY AMPHIBOLE THERMOBAROMETER. Proceedings of the YSU C: Geological and Geographical Sciences, 45(3 (226), 3–8. https://doi.org/10.46991/PYSU:C/2011.45.3.003

Issue

Vol. 45 No. 3 (226) (2011)

Section

Geology

License

Copyright (c) 2011 Proceedings of the YSU

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