Abstract—

The first results of optical microscopy, cathodoluminescence (CL), ultraviolet fluorescence (UV), electron-probe microanalysis (EPMA), and laser-ablation inductively-coupled plasma-mass spectrometry (LA-ICPMS) study of scheelite from quartz–molybdenite and quartz–carbonate–sulfide veins and veinlets (porphyry type), as well as the magnetite–sulfide massive, veinlets, and disseminated (skarn type) associations, of the Bystrinskoe skarn-porphyry Cu–Au–Fe deposit in the Eastern Transbaikal region, one of the largest gold–copper porphyry deposits in Russia, are reported. Despite the fact that scheelite is not a major ore mineral, it is found almost everywhere. This makes it possible to identify its crucial genetic features in both the two types of mineralization and the deposit as a whole. It is shown that scheelite from different types of mineralization has clearly determined individual characteristics, differing in abundance, associated minerals, CL and UV color, composition and concentrations of major and trace elements, and REE distribution patterns. These crucial features testify to a significant difference in the formation conditions of the studied mineralization types and reveal the dependence on the physicochemical and compositional parameters of the mineral-forming environment. This allows one to consider scheelite as a fundamentally important genetic indicator of the mineral-forming environments' evolution. Crucially important are the molybdenum concentration in scheelite and the type and shape of REE-spectra, which are generally controlled by mineral-forming fluid chemistry, the incorporation of REE in the structure of the mineral, and variations in the redox properties of the mineral-forming fluid.

中文翻译：

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俄罗斯东贝贝加尔地区Bystrinskoe Skarn-Porphyry铜-金-铁矿床白钨矿：遗传意义

摘要-

光学显微镜，阴极发光（CL），紫外荧光（UV），电子探针显微分析（EPMA）和激光烧蚀电感耦合等离子体质谱法（LA-ICPMS）的初步结果研究了石英，辉钼矿和白钨矿的白钨矿。跨贝加尔湖东部地区Bystrinskoe矽卡岩斑岩的Cu – Au – Fe矿床的石英–碳酸盐–硫化物脉状和脉状（斑岩型），以及磁铁矿–硫化物块状，脉状和弥散性（矽卡岩型）协会，最大的黄金之一–有报道称俄罗斯有铜斑岩矿床。尽管白钨矿不是主要的矿石矿物，但几乎到处都可以找到它。这使得有可能在两种类型的矿化和整个矿床中确定其关键的遗传特征。结果表明，来自不同矿化类型的白钨矿已明确确定了个体特征，其丰度，相关矿物质，CL和UV颜色，主要和微量元素的组成和浓度以及REE分布模式均不同。这些关键特征证明了所研究矿化类型的形成条件存在显着差异，并揭示了对成矿环境的物理化学和组成参数的依赖性。这使人们可以将白钨矿视为成矿环境演变的根本上重要的遗传指标。至关重要的是白钨矿中的钼浓度以及REE光谱的类型和形状，这通常受成矿流体化学的控制，稀土元素在矿物结构中的掺入以及矿物氧化还原特性的变化。形成流体。