| 刘相钊,薛超平,张冕.东昆仑东段哈日扎南区银多金属矿带成矿流体特征及成矿物质来源[J].地质找矿论丛,2023,38(4):422-430 |
| 东昆仑东段哈日扎南区银多金属矿带成矿流体特征及成矿物质来源 |
| Characteristics of ore-forming fluids and sources of ore-forming materials of Cu-Ag polymetallic belt in southern Harizha district, eastern section of East Kunlun Mountain area |
| 投稿时间：2023-02-17 |
| DOI：10.6053/j.issn.1001-1412.2023.04.003 |
| 中文关键词: 银多金属矿 成矿流体 H-O-S同位素 物质来源 东昆仑东段 |
| 英文关键词:Ag-polymetallic belt Ore-forming fluid H-O-S isotope Sources of ore-forming materials Eastern section of East Kunlun |
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| 中文摘要: |
| 哈日扎铜银多金属矿床位于东昆仑东段,南矿带(Ⅴ、Ⅵ矿带)是银多金属成矿的主要区域,银矿化分为早期银多金属矿化阶段和晚期独立银矿化阶段。本文在详细的野外观察基础上,对哈日扎银多金属矿带的含矿石英进行了流体包裹体温压、流体包裹体成分以及H—O同位素分析,对黄铜矿进行了S同位素分析。流体包裹体分析显示,银多金属矿化阶段成矿温度集中在220~320℃之间,对应盐度w(NaCl, eqv)=9%~10%,密度为0.92~0.98 g/cm3,成矿深度为2.6~3.0 km;晚期独立银矿化阶段成矿温度集中在160~200℃之间,对应盐度为w(NaCl, eqv)=6%~8%,流体密度为0.80~0.88 g/cm3,成矿深度为1.6~2.4 km;成矿流体总体为中低温、低盐度、低密度,浅成沉淀特征。单个流体包裹体成分分析显示成矿流体主要为H2O-NaCl2型,气相成分中含少量CO2和CH4等微量气体成分。对含矿石英的H-O同位素分析表明,样品中δ18O水=2.8×10-3~5.5×10-3,靠近岩浆流体附近,且成矿早期样品较晚期样品更靠近岩浆流体区域,推测成矿流体来源为北区斑岩系统。黄铜矿的硫同位素测试结果显示,硫化物总体δ34S=-7.2×10-3~-0.5×10-3,具有岩浆来源的特征。 |
| 英文摘要: |
| The Harizha Cu-Ag-polymetallic deposit is located in the eastern section of East Kunlun. The southern mineralization belt (Ⅴ and Ⅵ ore belts) is the main area for Ag polymetallic mineralization. There are two Ag mineralization stages, i.e. the early Ag polymetallic mineralization stage and the late independent Ag mineralization stage. Based on detal field observation P-T measurement and H-O isotope analysis are carried out on fluid inclusions of quartz and S isotope analysis on chalcopyrite from Harizha Au polymetallic ore belt. The result shows that the ore-forming temperature of the early Ag polymetallic stage is concentrated in range 220~320℃ with the corresponding salinity w(NaCl, eqv)=9%~10%, density 0.92~0.98 g/cm3 and ore-forming depth 2.6~3.0 km, the ore-forming temperature of the late independent Ag mineralization stage in range 160~200℃ with the corresponding salinity w(NaCl, eqv)=6%~8%, density 0.80~0.88 g/cm3 and the ore-forming depth 1.6~2.4 km. Analysis of single inclusion shows that the fluid belongs to H2O-NaCl type and a small amount of CO2 and CH4 and other trace gas components in the gas phase. H-O isotope analysis of the ore-bearing quartz shows δ18OH2O value in range 2.8×10-3 to 5.5×10-3, close to the magmatic fluid field and δ18OH2O value of the early mineralization stage closer to the magmatic fluid field than that of the late mineralization stage suggesting that the ore-forming fluid originated from the porphyry system in the north region. Isotope analysis of chalcopyrite shows δ34S values of δ34S=-7.2×10-3~-0.5×10-3 which is characteristic of magmatic origin. |
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