The study of clinopyroxene mineral chemistry in the amphibolites from the Makran accretionary complex (southeast of Iran)

Document Type : Original Article

Authors

1 Department of Geology, Faculty of Sciences, Lorestan University, Khorramabad, Iran

2 Institute of Geology and Geophysics, Academy of Sciences, Beijing, China

3 Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan, Iran

Abstract

The studied amphibolites are located in Hashtbandi Village, east of Minab. The Makran amphibolites form as a part of the metamorphic rocks of northern Makran ophiolitic belt, which are found in massive and orientated forms. Based on the indicator minerals, these rocks are amphibolite, epidote-garnet amphibolite and garnet-pyroxene amphibolite. Their main minerals include amphibole, garnet, plagioclase, pyroxene, epidote, quartz and sphene. Based on mineral chemistry, clinopyroxene in the epidote-garnet amphibolite and garnet-pyroxene amphibolite is calcic type and mostly in the diopside range. The studied pyroxenes are mostly magmatic and enriched in Si and are placed in the context of sub-alkaline rocks (tholeiitic and calc-alkaline). These clinopyroxenes are related to volcanic arc and based on the temperature-pressure calculations of pyroxenes, the temperature ranges between 1070 to 1130 C and the pressure is 5 to 10 kbar, which indicates the crystallization of these minerals have taken place at high temperature and medium-high pressure. Also, based on the amount of ferric ion in clinopyroxenes, they formed in the low oxygen fugacity environment.

Keywords

References

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  • Receive Date: 16 July 2024
  • Revise Date: 16 August 2024
  • Accept Date: 07 September 2024

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