Mineral chemistry of magnetite and fluid inclusions studies in the Kuh-Baba iron deposit, south of Hashtroud, NW Iran

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hafez darbani Majid; ABEDINI ALI; Aliyari Farhang; kalagari aliasghar

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2020 | Volume:27 | Issue:4 Page(s): 755-766

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Title

Mineral chemistry of magnetite and fluid inclusions studies in the Kuh-Baba iron deposit, south of Hashtroud, NW Iran

Author(s)

hafez darbani Majid | ABEDINI ALI | Aliyari Farhang | kalagari aliasghar | Issue Writer Certificate

Keywords

Mineral chemistry of magnetiteQ1

study of fluid inclusionsQ1

Kuh-BabaQ1

HashtroudQ1

IranQ2

Abstract

The Kuh-Baba iron ore deposit is located about 70 km south of Hashtroud, East-Azarbaidjan Province, NW Iran. The deposit is genetically affiliated with intrusive bodies of gabbroic to dioritic composition. The principal host rocks for the Fe mineralization include units of gabbro-norite and pyroxene hornblende gabbro-norite. The widespread alteration zones which are accompanied with Fe-mineralization are actinolitization, chloritization and epidotization. The principal ore mineral is magnetite with subordinate apatite showing massive, vein/veinlet, replacement, brecciated, and disseminated textures. The results of electron probe micro-analysis (EPMA) on 28 points of magnetite crystals show relatively high amounts of elements such as Al, Mn, Ti, and V. The values of components such as TiO2, V2O3, NiO and MgO in massive magnetites are higher than those present in disseminated and veinlet-type magnetites. Studies of primary fluid inclusions in quartz crystals coexisting with magnetite mineralization show that they are mainly liquid-rich 2-phase (L+V) and occasionally monophase-vapor (V). The homogenization temperatures of liquid-rich 2-phase inclusions range from 436º C to 544º C (average of 505º C). Based on temperatures of the last melting point of ice (TM), the obtained average salinity is 15. 82 wt% NaCl equ. Considering the measured parameters such as homogenization temperature, salinity, density, and pressure of the fluid inclusion, the depths of magnetite mineralization were estimated to be within the range of 1. 3-2. 7 (average of 2. 3) km (based on the lithostatic pressure). According to the EPMA and fluid inclusion data, the Kuh-Baba iron ores deposit can be classified as a ‘ Kiruna-type’ and subtype Iron-Oxide apatite-poor deposits and the origin of magnetite can be conceived as both magmatic and high-temperature hydrothermal.

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APA: Copy

hafez darbani, Majid, ABEDINI, ALI, Aliyari, Farhang, & kalagari, aliasghar. (2020). Mineral chemistry of magnetite and fluid inclusions studies in the Kuh-Baba iron deposit, south of Hashtroud, NW Iran. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 27(4 ), 755-766. SID. https://sid.ir/paper/359339/en

Vancouver: Copy

hafez darbani Majid, ABEDINI ALI, Aliyari Farhang, kalagari aliasghar. Mineral chemistry of magnetite and fluid inclusions studies in the Kuh-Baba iron deposit, south of Hashtroud, NW Iran. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2020;27(4 ):755-766. Available from: https://sid.ir/paper/359339/en

IEEE: Copy

Majid hafez darbani, ALI ABEDINI, Farhang Aliyari, and aliasghar kalagari, “Mineral chemistry of magnetite and fluid inclusions studies in the Kuh-Baba iron deposit, south of Hashtroud, NW Iran,” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 27, no. 4 , pp. 755–766, 2020, [Online]. Available: https://sid.ir/paper/359339/en

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