Mineral chemistry of the granitoides of West Ardakan (Central Iran)

Document Type : Original Article

Author

Department of Geology, Payame Noor University, Tehran, Iran

Abstract

The granitoides of west Ardakan are outcropped in the middle part of the Central Iran zone. Quartz, orthoclase and plagioclase are the main minerals and amphibole, biotite, sphene, zircon and apatite are secondary minerals. The dominant textures are medium to fine grain granular, granophyry and myrmikite[r1] . According to mineral chemistry data, calcic amphiboles of magnesiohornblende to actinolite nature have crystallized at temperatures of 530-890 ºC. Oligoclase to andesine plagioclased crystallized at 700-800 ºC. Magnesium biotites was crystallized at 650-730 ºC. On the basis of the oxidant conditions, magnetite are formed as opaque. The chemical analysis of all these minerals show the mantle nature of the magma. Magma seems to suffer produced these minerals, moderate to severe crustal contamination during its ascent. These granitoides are I type  and calc-alkaline and were formed in the subduction setting related to the active continental margin.

Keywords

References

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  • Receive Date: 17 October 2023
  • Revise Date: 05 December 2023
  • Accept Date: 26 December 2023

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