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.

中文翻译：

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Namovskoe 矿床（南锡霍特-阿林）的地质环境和金铋矿化

摘要

根据对纳莫夫斯科矿床矿石进行综合地质、矿物学和地球化学研究的结果，获得了有关矿化特征的新数据。该矿床的矿石形成与早白垩世二长岩浆作用密切相关，背景是沿中锡霍特-阿林断层活跃的左旋运动。含矿岩脉 U-Pb 测年得出的年龄为 103 Ma。除天然金外，该矿床的矿石还含有高浓度的银、铋和铜。矿石中登记了多种铋矿物：硫化物（铋矿）、碲化物（铁辉石）、磺基碲化物（碲辉石、荷铁矿-А 和荷铁矿-В）、银磺铋矿（辉辉石）、铅-铋硫盐（灰辉石、钙辉石、钴钠长石、锂锂长石、纳菲尔德石和方铅矿），Au（马尔方石）和天然 Bi 的金属间化合物。还鉴定出银矿物：氯化物（硅银矿）、硫化物（棘长石）和碲化物（铁锰矿）。纳莫夫斯科矿床的矿石矿物类型和地质结构将其归为在转变大陆边缘环境中形成的金矿床类型。提出了矿石成矿的地幔来源。