A study of zircon U-Pb dating and ore-forming fluid in the Bandiersirehong iron-copper polymetallic deposit, West Kunlun orogenic belt
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摘要: 班迪尔司热洪铜铁矿区位于西昆仑造山带西北部,铜铁矿化分布在花岗闪长岩体与碳酸盐岩的接触带上,受控于矽卡岩带,成矿与花岗闪长岩具有密切的时间、空间关系。本文对该矿床中与成矿关系密切的花岗闪长岩进行了详细的锆石U-Pb年代学研究,结果表明,LA-ICP-MS锆石U-Pb测年获得班迪尔司热洪花岗闪长岩成岩年龄为239.8±1.5Ma,表明成矿作用发生在早中三叠世。根据矿物组合和脉体穿插关系,班迪尔司热洪铜铁矿可分为4个成矿阶段:矽卡岩阶段、退化矽卡岩阶段、石英-硫化物阶段和碳酸盐阶段,石英-硫化物阶段为主成矿阶段。主成矿阶段石英脉中广泛发育流体包裹体,分别为气液两相包裹体(W型)、含子矿物三相包裹体(S型)和含CO2包裹体(C型)三类。流体包裹体研究表明,包裹体均一温度为145.5~304℃,盐度范围为0.9%~33.1% NaCleqv,成矿流体为H20-CO2-NaCl体系。班迪尔司热洪铜铁矿地质特征和成矿流体特征表明,班迪尔司热洪铜铁矿为热液交代矽卡岩型矿床,区域断裂为成矿岩浆提供运移通道,岩浆侵位发育矽卡岩型岩浆流体系统,并伴随着Cu、Fe矿化。Abstract: The Bandiersirehong iron-copper polymetallic deposit located in northwestward of West Kunlun orogenic belt. Cu-Fe mineralization controlled by skarn occurs in the contact zone between the granodiorite and carbonates. The granodiorite is spatially and temporally related to mineralization. In this study, we performed LA-ICP-MS zircon U-Pb dating analyses on the Bandiersirehong granodiorite closely related to Cu-Fe mineralization for the first time. Seventeen zircons from granodiorite sample yield excellent concordia results with a weighted mean 206Pb/238U age of 239.8±1.5Ma, which shows that the deposit formed in the Early-Middle Triassic. According to crosscutting relationships and minerals assemblages, the hydrothermal ore-forming process in the Bandiersirehong deposit can be divided into four stages: prograde stage, retrograde stage, quartz-sulfide stage, carbonate stage. Quartz-sulfide stage is the main mineralization stage with numerous fine veins of quartz and calcite. In hydrothermal quartz of dominant ore-forming process, three types of fluid inclusions can be observed. They are gas-liquid two-phase aqueous inclusions (W type), daughter mineral-bearing (S type) and CO2 (C type). Homogenization temperatures of fluid inclusions are between 145.5 to 304℃, the salinity of 0.9%~33.1% NaCleqv, and the fluid of this stage generally belongs to the H2O-CO2-NaCl system. The geological characteristics and metallogenic fluid features of Bandiersirehong iron-copper polymetallic deposit suggest that it is a skarn deposit. Regional fault provide migration pathways for the emplacement of metallogenic magma, which developped magmatic fluid systems and followed the Cu-Fe mineralization.
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Key words:
- Fluid inclusion /
- Granodiorite /
- Zircon U-Pb dating /
- Skarn /
- West Kunlun orogenic belt
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