Abstract

This paper provides information on the structural setting and ore composition of the Nevenrekan deposit. We provide an account of the regional and local factors of mineralization control. The ore bodies are confined to the junction between regional faults and annular ruptures of a circular subsidence. The geochemical zoning of the ore field is disturbed. We show how geochemical associations are distributed in the ore zones of this deposit. The structural geological and geochemical data, as well as results from a comparison among the Au‒Ag low sulfidation (LS) deposits at the Okhotsk–Chukchi, Uda–Murgali, and Central Kamchatka volcanogenic belts, shows that the mineralization occurred in two phases. The first phase involved the generation of epithermal Au–Ag mineralization, while the second, plutogenic, phase produced intrusion-related gold system that is seen as epidotization and silicification of rocks in the ore field, as well as in the metamorphism of volcanogenic mineralization. The presence of the later mineralization phase associated with granitoids is typical of the Nevenrekan deposit as distinguished from the other Au–Ag (LS) deposits in the Evensk ore region, and makes it similar in this respect to the Karamken, Nyavlenga, and Cirotan deposits.

中文翻译：

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火山结构演化和金-银低硫化矿化过程中的侵入相：俄罗斯马加丹州内文雷坎矿床

摘要

本文提供了有关Nevenrekan矿床的构造背景和矿石组成的信息。我们提供了矿化控制的区域和本地因素的说明。矿体仅限于区域性断层与圆形沉陷的环形破裂之间的交汇处。矿场的地球化学分区受到干扰。我们展示了该矿床的矿床区域中的地球化学联合分布。结构地质和地球化学数据，以及对鄂霍次克–楚科奇，乌达–穆加里和堪察加半岛中部火山带的Au‒Ag低硫化（LS）矿床的比较结果表明，成矿作用分为两个阶段。第一阶段涉及超热Au-Ag矿化的生成，第二阶段涉及成矿作用，相形成了与侵入有关的金系统，被认为是矿石田中岩石的岩石化和硅化作用以及火山成矿作用的变质作用。与埃文斯克矿区的其他Au-Ag（LS）矿床不同，Nevenrekan矿床典型地存在与花岗岩相关的后期矿化阶段，这使其在这方面与Karamken，Nyavlenga和Cirotan矿床相似。 。