Geological Setting and Gold–Bismuth Mineralization of the Namovskoe Deposit (Southern Sikhote-Alin)

IF 0.9 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Russian Journal of Pacific Geology Pub Date : 2023-12-01 DOI:10.1134/s1819714023060040

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Abstract

Based on the results of a comprehensive geological, mineralogical, and geochemical study of ores of the Namovskoe deposit, new data on the specifics of mineralization were obtained. The ores of the deposit were formed in close relation to the Early Cretaceous monzonitoid magmatism against the background of active left-hand movements along the Middle Sikhote-Alin fault. The U–Pb dating of the ore-bearing dyke provided an age of 103 Ma. In addition to native Au, the ores of the deposit contain high concentrations of Ag, Bi, and Cu. A variety of Bi minerals were registered in the ores: sulfide (bismuthinite), telluride (hedleyite), sulfotellurides (tetradymite, joseite-А, and joseite-В), Ag sulfobismuthite (matildite), Pb–Bi sulfosalts (aschamalmite, cannizzarite, cosalite, lillianite, nuffieldite, and galenobismuthite), an intermetallic compound of Au (maldonite), and native Bi. Ag minerals were identified as well: chloride (cerargyrite), sulfide (acanthite), and telluride (hessite). The typomorphic patterns of ore minerals and the geological structure of the Namovskoe deposit assign it to the type of gold deposits formed in a transform continental margin setting. A mantle source of ore mineralization is suggested.

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纳莫夫斯科（Namovskoe）矿藏（南锡霍特-阿林）的地质构造和金铋矿化作用

摘要根据对纳莫夫斯科矿床矿石进行的地质、矿物学和地球化学综合研究的结果，获得了有关矿化具体情况的新数据。该矿床矿石的形成与早白垩世单斜岩浆活动密切相关，其背景是沿中锡霍特-阿林断层的左旋运动十分活跃。含矿堤坝的 U-Pb 测定年龄为 103 Ma。除了原生金之外，该矿床的矿石还含有高浓度的银、铋和铜。矿石中含有多种铋矿物：硫化物（铋化物）、碲化物（hedleyite）、硫碲化物（tetradymite、joseite-А 和 joseite-В）、银硫铋化物（matildite）、铅铋硫化物（aschamalmite、cannizzarite、cosalite、lillianite、nuffieldite 和 galenobismuthite）、Au 的金属间化合物（maldonite）以及原生 Bi。此外还发现了银矿物：氯化物（cerargyrite）、硫化物（acanthite）和碲化物（hesite）。矿石矿物的类型形态和 Namovskoe 矿床的地质结构将其归类为在大陆边缘转化环境中形成的金矿床类型。建议矿石成矿来源于地幔。

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来源期刊

Russian Journal of Pacific Geology 地学-地球科学综合

CiteScore

1.30

自引率

37.50%

发文量

审稿时长

>12 weeks

期刊介绍： Russian Journal of Pacific Geology publishes the results of research on the Earth crust and mantle composition and provides articles on the geological structure and patterns of distribution of mineral deposits in the Pacific Ocean, marginal seas and continental margins. It discusses the topics of stratigraphy, sedimentology, magmatic activity, and seismicity. The journal deals with the problems of lithosphere plates tectonics, and offers the results of neotectonic, geomorphological, geodesic, environmental and mining studies in the Pacific region. The journal accepts theoretical, methodical and philosophical articles covering general issues of geology, geophysics, geochemistry, geoecology and mining. The journal also publishes critical notes and comments, and reviews.