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首页> 外文期刊>Economic geology and the bulletin of the Society of Economic Geologists >Crastal-Extension Ag-Pb-Zn Veins in the Xiong'ershan District, Southern North China Craton: Constraints from the Shagou Deposit
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Crastal-Extension Ag-Pb-Zn Veins in the Xiong'ershan District, Southern North China Craton: Constraints from the Shagou Deposit

机译：华北南部熊耳山区地壳扩展的银-铅-锌脉克拉通：沙沟矿床的约束

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摘要

The Shagou vein-type Ag-Pb-Zn deposit in the Xiong'ershan district, southern margin of the North China craton, is hosted within amphibolite facies metamorphic rocks of the Late Archean to early Paleoproterozoic Taihua Group. The Ag-Pb-Zn veins are localized in NE- to NNE-trending brittle faults and typically display symmetrical zoning consisting of siderite, quartz + sphalerite, galena, and quartz + calcite from the margin toward the center of each vein. Ore-related hydrothermal alteration is well developed on both sides of the veins, dominated by silicification, sericitization, chloritization, and carbonatization. Sericite separates extracted from a major Ag-Pb-Zn vein yield a ~(40)Ar/~(39)Ar plateau age of 140.0 ± 1.0 Ma (1σ) and isochron age of 141.1 ± 1.6 Ma (1σ), indicating that mineralization occurred at the beginning of Early Cretaceous. Field and textural relationships indicate four hydrothermal stages marked by assemblages of quartz + siderite (stage I), quartz + sphalerite + ankerite (stage II), quartz + galena + silver minerals + ankerite (stage III), and quartz + calcite (stage IV), respectively. Silver minerals are abundant in all veins and are composed of, in paragenetic order, argentiferous tetrahedrite, polybasite, jalpaite, argentite, and native silver. These silver minerals commonly occur as replacements of galena, chalcopyrite, and other sulfides, or as fillings of microfractures in sulfides and quartz.
机译：华北克拉通南部边缘的熊耳山地区的沙沟脉状Ag-Pb-Zn矿床，位于太古宙晚期至古元古代泰化群的闪石岩相变质岩中。 Ag-Pb-Zn脉位于局部NE到NNE趋势的脆性断层中，通常显示对称的分区，由菱铁矿，石英+闪锌矿，方铅矿和石英+方解石组成，从边缘到每个静脉的中心。与矿石有关的热液蚀变在两面都发育得很好，主要是硅化作用，胶化作用，氯化作用和碳化作用。从主要的Ag-Pb-Zn脉中提取的绢云母分离出的〜（40）Ar /〜（39）Ar平台年龄为140.0±1.0 Ma（1σ），等时年龄为141.1±1.6 Ma（1σ），表明矿化发生在白垩纪早期。场和质地的关系表明了四个热液阶段，其特征为：石英+菱铁矿（阶段I），石英+闪锌矿+铁矿（阶段II），石英+方铅矿+银矿物+铁矿（阶段III）和石英+方解石（阶段IV） ）， 分别。银矿物质在所有矿脉中都很丰富，并且按照亚基因顺序由银质四面体，多磷铁矿，钙铝石，银辉石和天然银组成。这些银矿物质通常以方铅矿，黄铜矿和其他硫化物的替代形式出现，或者以硫化物和石英中的微裂缝填充物形式出现。

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