Volume 32, Issue 3 (10-2024)
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Jabbarzadeh Z, Siahcheshm K, Calagari A A. Mineralogical, alteration and fluid inclusion studies of the mineralization occurrence at Tazehkand, northeast of Zanjan, NW Iran. www.ijcm.ir 2024; 32 (3) :409-424
URL: http://ijcm.ir/article-1-1878-en.html
URL: http://ijcm.ir/article-1-1878-en.html
1- Department of Earth Sciences, Faculty of Natural Sciences, Tabriz University, Tabriz, Iran
Abstract: (665 Views)
The Tazekand mineral prospect, as part of Tarom-Hashtjin metallogenic belt, is located ~45 km northeast of Zanjan Province, NW Iran. The host rocks of mineral index consist of intrusive rocks with lithologic compositions of quartz monzonite, monzodiorite, diorite to gabbro with the Oligocene and Oligo-Miocene in age. The alteration zones in this area are mainly of chlorite-sericite, phyllic, argillic, propylitic, silicic and carbonate types. Mineralization occurred principally as disseminations, cross-cutting veins-veinlets and replacement in two separate hypogene and supergene stages. Pyrite is the main hypogene sulfide mineral accompanied by magnetite, micaceous hematite (specularite), chalcopyrite and galena. The main supergene minerals in this area include hematite, goethite, limonite, bornite, chalcocite, covellite, azurite and malachite that accompany the hypogene mineral assemblage. Investigation of the phase contents of fluid inclusions within the quartz-sulfide veins-veinlets show the phyllic, silicic and argillic alteration zones. Four types of fluid inclusions have been recognized: (1) mono-phase liquid (L), (2) mono-phase vapor (V), (3) liquid-rich two-phase (L+V) and (4) vapor-rich two-phase (V+L). Homogenization temperatures of the studied fluid inclusions vary from 140 to 300 °C and the last ice-melting temperatures of aqueous two-phase inclusions showed that the salinities range from 0.18 to 8.81 wt% NaCl Equivalent. Based on the microthermometric results of fluid inclusions, it can be conceived that episodic boiling and dilution by subsurface water of meteoric origin were the main mechanisms in development and evolution of the ore-bearing fluids in this prospect. The zonation pattern of the alteration, mineralization and the fluid inclusion data indicate that the Tazehkand mineral index is much similar to the metallic veins associated with porphyry copper deposits.
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