Volume 10, Issue 2 (Autumn & Winter 2024)
KJES 2024, 10(2): 344-375 |
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Ebrahimi Fard H, Ghasemi Siani M, Karimi Shahraki B, Sharafi Nia F. Geothermometry of skarn zones in the Tappeh Ghermez (A') iron deposit, Sangan iron mining district, NE Iran. KJES 2024; 10 (2) :344-375
URL: http://gnf.khu.ac.ir/article-1-2911-en.html
URL: http://gnf.khu.ac.ir/article-1-2911-en.html
1- Kharazmi University , hamedebrahimi772@gmail.com
2- Kharazmi University
3- Iranian Mineral Processing Research Center
2- Kharazmi University
3- Iranian Mineral Processing Research Center
Abstract: (136 Views)
The Sangan mining district, the largest Fe-skarn district in Iran, is located in the northeastern part of the Alborz magmatic arc. It comprises 14 deposits (1 Gt tons and a grade of 35-60% Fe), which have an east-west trend and are divided into three parts: eastern, central and western where the Tappeh Ghermez iron deposit (A') is located in the western part. The skarnification formed near the Sarnowsar syenogranitic intrusive body, and is composed of: 1) prograde endoskarn and exoskarn zones (clinopyroxene-garnet skarn subzone) and 2) retrograde exoskarn zone (amphibole skarn subzone). Thermometry of skarnification was carried out based on the chemistry of skarn silicate minerals and their agreement with the results of microthermometry studies of fluid inclusion carried out on garnet and calcite in order to determine the physicochemical conditions and temperature of skarnification in the Tappeh Ghermez deposit. Geothermometry of the garnet-clinopyroxene pair minerals, indicated temperatures of 302 to 442°C for the prograde skarn zone. Based on the geothermometry of the calcic amphiboles in the retrograde zone, formation temperatures of 206 to 333°C have been obtained. The results of the geothermometry of the prograde and retrograde skarn zones are consistent with the results of the microthermometry of the fluid inclusions. Andradite is stable at temperatures above 430°C, even under high sulfidation conditions. At temperatures below 430°C and a relatively high fugacity of sulfur (greater than 10-6), andradite altered into calcite, quartz and pyrite. As fS2 decreases (about 10-6), such fluids form the magnetite complex. Itcan therefore be concluded that retrograde metasomatizing fluids in the Tappeh Ghermez iron skarn deposit have a sulfur fugacity of 10-6.5 and temperatures below 430°C.
Keywords: Geothermometry, Skarn zones, Tappeh Ghermez iron deposit, Sangan mining district, Eastern Alborz zone
Type of Study: Original Research |
Subject:
Economic Geology
Received: 2024/08/28 | Accepted: 2024/12/16 | Published: 2024/12/28
Received: 2024/08/28 | Accepted: 2024/12/16 | Published: 2024/12/28
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