| 南秦岭柞水-山阳矿集区金盆梁金矿床成因——来自流体包裹体及C-H-O-S-Pb同位素的制约 |
| Received:January 12, 2024 Revised:June 12, 2024 点此下载全文 |
| 引用本文：GE ZhanLin,GU XueXiang,ZHANG YongMei,GAO YongBao,HAO Di,ZHENG YanRong,LIU Ming,WANG Hui.2024.Genesis of Jinpenliang gold deposit in Zhashui-Shanyang ore cluster area, South Qinling: Constraints from fluid inclusions and C-H-O-S-Pb isotopes[J].Mineral Deposits,43(4):877~898 |
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| Author Name | Affiliation | E-mail | | GE ZhanLin | Technology Innovation Center for Gold Ore Exploration, China Geological Survey, Xi'an 710100, Shaanxi, China
Xi'an Center of Mineral Resources Survey, China Geological Survey, Xi'an 710100, Shaanxi, China
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China | | | GU XueXiang | School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
The National 305 Project Office of Xinjiang, Urumqi 830000, Xinjiang, China | xuexiang_gu@cugb.edu.cn | | ZHANG YongMei | School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China | | | GAO YongBao | Technology Innovation Center for Gold Ore Exploration, China Geological Survey, Xi'an 710100, Shaanxi, China
Xi'an Center of Mineral Resources Survey, China Geological Survey, Xi'an 710100, Shaanxi, China | | | HAO Di | Technology Innovation Center for Gold Ore Exploration, China Geological Survey, Xi'an 710100, Shaanxi, China
Xi'an Center of Mineral Resources Survey, China Geological Survey, Xi'an 710100, Shaanxi, China | | | ZHENG YanRong | Technology Innovation Center for Gold Ore Exploration, China Geological Survey, Xi'an 710100, Shaanxi, China
Xi'an Center of Mineral Resources Survey, China Geological Survey, Xi'an 710100, Shaanxi, China | | | LIU Ming | Technology Innovation Center for Gold Ore Exploration, China Geological Survey, Xi'an 710100, Shaanxi, China
Xi'an Center of Mineral Resources Survey, China Geological Survey, Xi'an 710100, Shaanxi, China | | | WANG Hui | Xi'an Center of Mineral Resources Survey, China Geological Survey, Xi'an 710100, Shaanxi, China | |
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| 基金项目:本文得到陕西省自然科学基础研究计划资助项目（编号：2023-JC-QN-0284, 2024JC-YBQN-0349）、国家自然科学基金重点项目（编号：42130804）、中国地质调查局项目（编号：DD20220966、DD20230060、DD20230378）、新疆维吾尔自治区重点研发计划项目（编号：2023B03016）和新疆维吾尔自治区“天池英才”引进计划项目联合资助 |
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| 中文摘要:金盆梁是南秦岭柞水-山阳矿集区勘查的一处微细浸染型金矿床，矿床成因与成矿机制尚不清楚。矿体产于上泥盆统桐峪寺组粉砂质板岩和钙质板岩中，以浸染状、脉状金锑矿化为主，成矿过程可划分为3个阶段：毒砂-黄铁矿-硅化阶段（Ⅰ）、石英-辉锑矿-白铁矿±锑氧化物阶段（Ⅱ）和方解石-石英阶段（Ⅲ）。流体包裹体及C-H-O-S-Pb同位素研究结果显示，Ⅱ阶段主要为金锑矿化，以H2O-NaCl两相包裹体占绝对优势，成矿流体属于中温（200~290℃）、低盐度（w(NaCleq)为0~6.0%）、低密度（0.64~0.99 g/cm3）的H2O-NaCl±CO2体系，以循环大气降水为主。无矿化的Ⅲ阶段主要发育H2O-NaCl两相包裹体，含少量CO2-H2O-NaCl±CH4、纯CO2±CH4及含子晶多相包裹体，流体以中低温（140~280℃）、低盐度（w(NaCleq)为2.0%~8.0%）、低密度（0.68~1.02 g/cm3）的富CO2-H2O-NaCl±CH4体系为主，或存在少量高温、高盐度、高密度H2O-NaCl体系的岩浆热液混入。硫化物δ34S值为较大负值（−12.50‰~−10.20‰），Pb同位素组成具上地壳源铅特征，成矿物质主要来源于围岩地层。综合研究表明，金盆梁金矿的成因类型属于卡林型金矿，水-岩反应（围岩硫化作用）是金富集沉淀的主要机制。 |
| 中文关键词:矿床成因 流体包裹体 C-H-O-S-Pb同位素 金盆梁金矿床 南秦岭 |
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| Genesis of Jinpenliang gold deposit in Zhashui-Shanyang ore cluster area, South Qinling: Constraints from fluid inclusions and C-H-O-S-Pb isotopes |
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| Abstract:The Jinpenliang is an explored micro-disseminated gold deposit in the Zhashui-Shanyang ore cluster area, South Qinling. To date, its ore genesis and metallogenic mechanism are still unclear. These Au-Sb orebodies at Jinpenliang deposit are hosted by the silty slate and calcareous slate of the Upper Devonian Tongyusi Formation, occurring as disseminated and veinlet mineralization. The ore-forming process can be classified into three stages, namely, arsenopyrite-pyrite-silicification stage (Ⅰ), quartz-stibnite-marcasite±antimony oxide stage (Ⅱ), and calcite-quartz stage (Ⅲ). Fluid inclusion and C-H-O-S-Pb isotope studies indicate that inclusions in stage Ⅱ quartz (Au and Sb mineralization) are dominated by the H2O-NaCl two-phase inclusions. The metallogenic fluid is characterized by a medium-temperature (200~290℃), low-salinity (w(NaCleq)=0~6.0%), and low-density (0.64~0.99 g/cm3) H2O-NaCl±CO2 system, predominately originated from meteoric water. Besides the H2O-NaCl two-phase inclusions, there are a small amount of CO2-H2O-NaCl±CH4 inclusions, pure CO2±CH4 inclusions, and daughter mineral-bearing multiphase inclusions identified in quartz of stage Ⅲ barren veins. This nonmetallogenic fluid primarily belongs to a medium to low-temperature (140~280℃), low-salinity (w(NaCleq) 2.0%~8.0%), and low-density (0.68~1.02 g/cm3) CO2-H2O-NaCl±CH4 system, with a high-temperature, high-salinity, and high-density H2O-NaCl system of magmatic water mixed in. The δ34S values of sulfides range from −12.50‰ to −10.20‰, and the Pb isotopic compositions have the characteristics of the upper crust, implying that the ore-froming materials were mainly derived from wall rocks. Comprehensive studies show that the Jinpenliang deposit can be classed as a typical Carlin-type gold deposit, and the water-rock reaction (sulfidation) is the crucial mechanism for gold precipitation. |
| keywords:ore genesis fluid inclusion C-H-O-S-Pb isotopes Jinpenliang gold deposit South Qinling |
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