Characteristics of fluid inclusions in the Cenozoic volcanic-hosted Kushk-e-Bahram Manto-type Cu deposit of central Iran

IF 0.9 Q3 GEOLOGY

Geologos Pub Date : 2020-08-01 DOI:10.2478/logos-2020-0012

M. Jebeli, P. Afzal, M. Pourkermani, A. Jafarirad

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引用次数: 1

Abstract

Abstract The Kushk-e-Bahram Manto-type Cu deposit is located in central Iran, within Eocene to Oligo–Miocene volcanic strata which occur in the central part of the Uremia-Dokhtar Magmatic Arc (UDMA). Propylitization, silicification, argillization and carbonatization are the main types of alteration to have affected the pyroclastic and volcanic rocks. There are high amounts of oxide minerals, including malachite, azurite, hematite, magnetite and goethite. Three types of primary FIs have been determined in the Kushk-e-Bahram deposit, namely; I: two-phase liquid-rich FIs (L+V), II: mono-phase liquid FIs, III: two-phase vapour-rich FIs which have been identified based on petrographical studies. Based on FI studies of co-existing quartz and calcite, homogenization temperatures (Th) must have been between 67 and 228°C, with an average of 158°C. Moreover, salinity is between 14.0–30.3 wt% NaCl, equivalent to a 19.6% average. Fluid density values vary from 0.8 to 1.1 gr/cm3. Based on FI data and related diagrams, the depth of their trapping was estimated to be <200 m and ore formation occurred at pressures of <50 bars. Consequently, mineralogy, host rock and FIs characteristics in the Kushk-e-Bahram deposit are similar to the Manto-type Cu deposits in Mesozoic-Cenozoic volcanic belts of Iran and South America.

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伊朗中部新生代火山岩型Kushk-e-Bahram-Manto型铜矿的流体包裹体特征

摘要Kushk-e-Bahram-Manto型铜矿床位于伊朗中部，位于Uremia Dokhtar岩浆弧（UDMA）中部的始新世至渐新世-中新世火山地层内。丙基化、硅化、泥化和碳酸盐化是影响火山碎屑岩和火山岩的主要蚀变类型。有大量的氧化物矿物，包括孔雀石、天青石、赤铁矿、磁铁矿和针铁矿。Kushk-e-Bahram矿床中已确定三种类型的原生FI，即：；I：两相富含液体的FIs（L+V），II：单相液体FIs，III：两相富含蒸汽的FIs，已根据岩石学研究确定。根据共存石英和方解石的FI研究，均化温度（Th）必须在67至228°C之间，平均温度为158°C。此外，盐度在14.0–30.3 wt%NaCl之间，相当于19.6%的平均值。流体密度值在0.8至1.1 gr/cm3之间变化。根据FI数据和相关图表，它们的捕获深度估计为<200 m，在<50 bar的压力下形成矿石。因此，Kushk-e-Bahram矿床的矿物学、主岩和FIs特征与伊朗和南美洲中新生代火山带的Manto型铜矿相似。

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来源期刊

Geologos GEOLOGY-

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

12 weeks