Geochemistry and petrogenesis of the granitoid rocks in Mahiroud volcano-plutonic complex; Southeast of Sarbisheh (Eastern of Iran)

Articles in Press

Authors

1 Department of Geology, Faculty of Sciences, Lorestan University

2 Department of Geology, Faculty of Science, lorestan University

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

4 Department of Geology, Faculty of Sciences, Shahid Chamran University of Ahvaz

5 Department of Geology, Faculty of Sciences, Lorestan University, Khorramabad, Iran.

Abstract

The study granitoid pluton is a part of the Mahiroud (Cheshmeh Ostad) volcano-plutonic complex in the southeast of Sarbisheh (South Khorasan province). The composition of this pluton is mostly granodiorite-tonalite. Its main minerals include plagioclase, quartz, orthose and hornblende with granular texture. Based on mineral chemistry, amphiboles in these rocks have a calcic composition and are placed in the Mg-hornblende subgroup. These amphiboles crystallized under pressure conditions of 0.5 to 2 kbar, temperature between 700 - 725 ºC and high oxygen fugacity. Based on the geochemical results, this granitoid pluton is in the range of type I, metalunimous and calc-alkaline granites. Also, this puloton is been formed through mantle partial melting so that La and Dy increase with the increase of La/Sm and Dy/Yb ratios. These rocks were formed through partial melting and less than 5% of sediments have been subducted and fluid has entered the magma source. The spider diagram of trace elements normalized with the primary mantle shows relative enrichment with a gentle slope of LREE elements compared to HREE. This granitoid pluton is similar to subduction-related granites and is consistent with the calc-alkaline magmatic arc in the eastern of Iran which is the result of the subduction of the Neotethys oceanic plate (Sistan Ocean) under the eastern zone of Iran.

Keywords

New Findings in Applied Geology

Articles in Press, Accepted Manuscript
Available Online from 11 September 2024

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History

  • Receive Date: 13 April 2024
  • Revise Date: 08 July 2024
  • Accept Date: 11 September 2024

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