Petrography, geothermobarometry and  tectonomagmatic setting of intrusive rocks in Khuni  (Northeast of Anarak, Central Iran)

Tabatabaei Manesh, Seyed Mohsen; Shirdashtzadeh, Nargess; Ranjbar, Saeideh

doi:10.52547/gnf.6.2.375

Volume 6, Issue 2 (Autumn&Winter 2021) KJES 2021, 6(2): 375-396 | Back to browse issues page

‎ 10.52547/gnf.6.2.375

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Tabatabaei Manesh S M, Shirdashtzadeh N, Ranjbar S. Petrography, geothermobarometry and tectonomagmatic setting of intrusive rocks in Khuni (Northeast of Anarak, Central Iran). KJES 2021; 6 (2) :375-396
URL: http://gnf.khu.ac.ir/article-1-2762-en.html

Petrography, geothermobarometry and tectonomagmatic setting of intrusive rocks in Khuni (Northeast of Anarak, Central Iran)

Seyed Mohsen Tabatabaei Manesh ^*

¹, Nargess Shirdashtzadeh²

, Saeideh Ranjbar²

1- University of Isfahan , tabataba@sci.ui.ac.ir.ir
2- University of Isfahan

Abstract: (1542 Views)

In the southwest of Khuni mountain and the north of Kal-e-Kafi intrusion (northeast of Anarak), the igneous rocks of Khuni are cropped out. They dominantly show porphyritic texture and are similar to monzodiorite in composition. The phenocrysts mainly are clinopyroxene (diopside), amphibole (magnesiohastingsite to magnesian hastingsite), and feldspar (orthoclase in the rim and andesine in the core). Accessory minerals include primary biotite, apatite, sphene, and magnetite. The secondary minerals are biotite, calcite, epidote, tremolite- actinolite, and chlorite. Anti-rapakivi texture in feldspar is petrographic evidence of magma contamination. Application of various geothermobarometric methods for clinopyroxene and amphibole crystals in Khuni rocks yielded a crystallization temperature of ~1150°C for clinopyroxene and pressure range of 7-8 kb and temperatures of ~900-950°C for the amphibole phenocryst. Thermobarometry and chemistry of clinopyroxene and amphibole phenocrysts indicate that the rock-forming melt was formed by melting the continental crust in the Anarak area, as a result of the subduction-related magmatism of Eocene during the Neo-Tethys subduction beneath Central Iran.

Keywords: petrology, geothermobarometry, Khuni intrusive rocks, Anarak, Isfahan

Full-Text [PDF 2831 kb] (519 Downloads)

Subject: Petrology
Received: 2020/08/4 | Accepted: 2021/02/20 | Published: 2021/02/28