Minerals chemistry and geothermobarometry of Dourbeh and Nari intusive bodies of W Urumieyeh, NW Iran

Document Type : Original Article

Authors

J. , Gh. , H.

Abstract

The studied bodies are located in the west of Urumieyeh Lake and northeast of Oshnavieyeh, in the Sanandaj-Sirjan structural zone. Compositionaly, these bodies are formed from gabbro-diorite (Dourbeh) and granite (Nari). Gabbrodiorite rocks are composed of plagioclase (andesine to bytownite), amphibole (calcic group and magnesio-hornblende-tschermakite-hornblende type) and pyroxene (augite) as the essential minerals. The essential minerals in granitic rocks are quartz, plagioclase (albite-oligoclase), alkali-feldspar (orthoclase) and mafic minerals are amphibole (actinolite) and biotite (annite). These rocks are metaluminous and have calc-alkaline nature and belong to I-type granitoids. Geothermobarometry of amphibole and biotite suggest that crystallization equilibrium temperatures at 700-860°C, at 2.21-7.10 Kbar for gabbrodiorite and 740-760°C for granitic rocks respectively. These conditions are in agreement with their formation and indicating crystallization crustal depths of about 8-26 Km.

Keywords

References

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Iranian Journal of Crystallography and Mineralogy
Volume 28, Issue 3 - Serial Number 79
October 2020
Pages 623-632

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History

  • Receive Date: 13 August 2019
  • Revise Date: 25 October 2019
  • Accept Date: 18 December 2019

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