Geology, petrography, mineralization and fluid inclusion studies in the Mesgarabad exploration area, southeast of Tehran

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NOROUZI M.; LOTFI M.; EMAMI M.H.; JAMALI H.; ABEDINI A.

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Journal: GEOSCIENCES Year:2018 | Volume:27 | Issue:106 Page(s): 243-256

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Title

Geology, petrography, mineralization and fluid inclusion studies in the Mesgarabad exploration area, southeast of Tehran

Author(s)

Keywords

Subvolcanic intrusive bodiesQ1

EpithermalQ1

SkarnQ2

GarnetQ2

Fluid InclusionsQ1

Mesgarabad AreaQ1

TehranQ2

IranQ2

Abstract

Mesgarabad Area is located in ~10 km southeast of Tehran, the Central-Alborz structural zone (CASZ) of Iran. The rock units exposed in the area consist of Eocene volcanics, volcano-sedimentary and sedimentary rocks intruded by post upper Eocene granodiorite to quartz monzo-diorite. These Subvolcanic intrusive bodies show porphyroid to microgranular textures and have calc-alkaline magmatic nature. These bodies produced hydrothermal fluids causing extensive alteration zones developed along the Se-Darreh-e-Bozorg strike-slip fault. The effects of hydrothermal fluids on the entire Eocene rock units and Subvolcanic intrusive bodies are remarkable. The main alterations are silicification, sericitization, chloritization, epidotizaton, actinolitization, argillization, carbonatization, and alunitization-jarositization, which provided suitable physico-chemical conditions for ore-mineralization. The penetration of Subvolcanic intrusive bodies into the Eocene volcanics, volcano-sedimentary and sedimentary rocks brought about Skarn mineralization and Epithermal barite veins. Microscopic studies and advanced analysis showed that the principal mineral phases in the Epithermal zones are magnetite, pyrite, chalcopyrite, bornite, chalcocite, barite, Cu+Sn+Fe alloy, hematite, psilomelane, jacobsite, martite, geothite, and lepidochrosite. The Skarnification processes occurred at two distinct stages, (1) progressive and (2) retrogressive. The pyrometasomatic anhydrous minerals such as andradite-grossularite formed during progressive stage and the hydrous minerals like hematite, epidote, chlorite, tremolite-actinolite, calcite, quartz, pyrite, chalcopyrite and chalcocite were developed during retrogressive stage. Fluid inclusion studies on primary aqueous inclusions trapped in barite crystals revealed fluid that mixing of two fluids having different physicochemical conditions played an important role for ore deposition.

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APA: Copy

NOROUZI, M., LOTFI, M., EMAMI, M.H., JAMALI, H., & ABEDINI, A.. (2018). Geology, petrography, mineralization and fluid inclusion studies in the Mesgarabad exploration area, southeast of Tehran. GEOSCIENCES, 27(106 ), 243-256. SID. https://sid.ir/paper/32093/en

Vancouver: Copy

NOROUZI M., LOTFI M., EMAMI M.H., JAMALI H., ABEDINI A.. Geology, petrography, mineralization and fluid inclusion studies in the Mesgarabad exploration area, southeast of Tehran. GEOSCIENCES[Internet]. 2018;27(106 ):243-256. Available from: https://sid.ir/paper/32093/en

IEEE: Copy

M. NOROUZI, M. LOTFI, M.H. EMAMI, H. JAMALI, and A. ABEDINI, “Geology, petrography, mineralization and fluid inclusion studies in the Mesgarabad exploration area, southeast of Tehran,” GEOSCIENCES, vol. 27, no. 106 , pp. 243–256, 2018, [Online]. Available: https://sid.ir/paper/32093/en

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