Petrogenesis of skarns in Hararan region in the northwest of Lalezar igneous complex using pyroxene-garnet mineralogy and temperature-pressure measurement.

Document Type : Original Article

Authors

1 Department of Geology, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran.

2 Department of Geology, Kharazmi University, Faculty of Earth Sciences, Tehran, Iran.

Abstract

The Lalezar igneous complex is located on the border of the Sanandaj-Sirjan zone and the southeastern parts of the Urmia-Dakhtar volcanic arc and in the northeast of Baft city in Kerman Province. In the northwestern and western boundaries of the intrusive body, there are relatively wide contact metamorphic carbonate rocks. In the southern part of Hararan, the Lalezar igneous body with the Oligo-Miocene limestone and marl complex (equivalent to the Qom Formation), as large contact with metamorphism halo (skarn and marble parts), is the most widespread. Based on microscopic studies, garnet, calcite, wollastonite, pyroxene, olivine, idocrase, and epidote minerals are formed in skarns. Different metamorphic zones including garnet-clinopyroxene, olivine-clinopyroxene, wollastonite-garnet, and garnet-epidote have appeared. Based on the geochemical analysis of the minerals (EPMA), the garnets contain more than 70% grossular (calcium-rich garnet) and less than 30% almandine (iron-rich garnet). The composition of clinopyroxenes belongs to the first group (calcium-iron and magnesium) and of the wollastonite-enstatite type, where the amount of wollastonite is more than 50%. Also, there is less than 10% ferrosilite in the composition of these clinopyroxenes. Based on the garnet-clinopyroxene temperature-pressure measurement, the temperature of skarn formation, based on various equations presented, is between 413 and 530 degrees Celsius and the pressure is 1.5 to 2.5 kbar. The existing paragenesis as well as thermodynamic conditions indicate oxygen fugacity greater than 0.2. This phenomenon indicates the activity of fluids rich in silicate-rich solutions in the formation of these skarns.
 

Keywords

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  • Receive Date: 15 April 2023
  • Revise Date: 03 June 2023
  • Accept Date: 30 July 2023

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