Application of amphibole and plagioclase mineral chemistry for studying of Jebal-E-Barez granitoid genesis and geothermobarometry (Kerman province, Bam)

Document Type : Original Article

Authors

Shahid Bahonar University of Kerman

Abstract

The Jebal-E-Barez Oligocene granitoid is located in the southeastern Bam, and in the southeastern part of the Urumieh-Dokhtar Magmatic Assemblage. Based on petrographic studies, this granitoid includes tonalite, granodiorite, granite and alkaligranite, which are composed of quartz, plagioclase, amphibole, biotite and alkali feldspar. The albite of plagioclase ranges from 38.38 to 67.26 percent, and its composition is oligoclase to andesine. Composition of calcic amphiboles varies from magnesiohornblende to tschermakite, which is feature of I type granite. The Na2O amount and calc-alkaline nature of amphiboles indicate subduction zone for this granitoid, furthermore Al2O3, TiO2 and Mg#  amounts of amphiboles indicate crust and mantle mixing in the formation of granitoid magma. The geobarometry studies clarify that hornblende crystallization occurred in 2 kb, in addition to the geothermometry studies on aluminum of  amphibole and hornblende-plagioclase pair minerals display crystallization temperature average of Jebal-E-Barez granitoid is 800 oC. Jebal-E-Barez granitoid ƒO2 determine magma oxidation state.

Keywords

References

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Iranian Journal of Crystallography and Mineralogy
Volume 26, Issue 3 - Serial Number 71
October 2018
Pages 751-766

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History

  • Receive Date: 07 October 2017
  • Revise Date: 29 December 2017
  • Accept Date: 03 February 2018

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