Mineralization, geochemistry, fluid inclusion and stable isotopes (O, S) studies in the Takht Fe-skarn deposit, NE Hamedan

Haghighi Bardineh, S. N.; Zarei Sahamieh, R.; Zamanian, H.; Ahmadi Khalaji, A.

doi:10.22071/gsj.2018.63797

Document Type : Original Research Paper

Authors

¹ Ph.D. Student, Department of Geology, Faculty of Sciences, Lorestan University, Khoram Abad, Iran

² Associate Professor, Department of Geology, Faculty of Sciences, Lorestan University, Khoram Abad, Iran

³ Assistant Professor, Department of Geology, Faculty of Sciences, Lorestan University, Khoram Abad, Iran

https://doi.org/10.22071/gsj.2018.63797

Abstract

The Takht iron deposit is located 120 km northeast of the Hamedan City in the Urumieh-Dokhtar magmatic belt. The Miocene Takht granodiorite intruded into the Cretaceous carbonates and resulted in Fe-skarn formation. Epigenetic mineralization in the Takht Deposit occurred predominantly as vein and lenticular ore bodies accompanied with argillic, carbonation, chloritization, epidotization and silicfication alterations and minerals including garnet, pyroxene, epidote, tremolite- actinolite, phlogopite, hornblende, quartz, calcite, magnetite, pyrite, specularite, chalcopyrite, hematite, limonite, goethite and malachite. Chemical composition indicates the presence of Si, Al, Ca, Mg, Ti and chalcophile elements such as Cu, Zn, As and Pb that originate from the coexistence of silicate and sulfide minerals with magnetite. The microthermometric results revealed homogenization temperatures (Th) from 153.2°C to 338.3°C and salinity from 0.827 wt.% NaCl eq. to 25.36 wt.% NaCl eq.. The δ¹⁸O (SMOW) values of magnetite were measured in the range of −0.46‰ to +2.31‰ and δ¹⁸O water is +8.1‰ to +10.9‰, respectively. These isotope values are similar to magmatic fluids that were also equilibrated with ¹⁸O enriched sources. The δ³⁴S (V-CDT) values of pyrite show ranges of +7.3‰ to +12.5‰ and the original ﬂuid δ³⁴S H₂S values were estimated ranging from +5.7‰ to +10.9‰. These positive δ³⁴S values confirm that sulfur is provided by evaporate sulfates. During the retrograde stage of the Takht Skarn, re-mobilized metals accompanied with metal-bearing fluids (provided by intrusion) were mixed with sulfur-bearing descending meteoric waters and eventually, the mixing of the two fluids led to calcic Fe-skarn mineralization in Cretaceous carbonates.

Keywords

20.1001.1.10237429.1397.27.107.11.2

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Scientific Quarterly Journal of Geosciences

Mineralization, geochemistry, fluid inclusion and stable isotopes (O, S) studies in the Takht Fe-skarn deposit, NE Hamedan

References

References

Volume 27, Issue 107
Volume 26, Issue 107, spring 2018
June 2018
Pages 99-112

Mineralization, geochemistry, fluid inclusion and stable isotopes (O, S) studies in the Takht Fe-skarn deposit, NE Hamedan

References

References

Volume 27, Issue 107Volume 26, Issue 107, spring 2018June 2018Pages 99-112

Volume 27, Issue 107
Volume 26, Issue 107, spring 2018
June 2018
Pages 99-112