Abstract

For the first time, based on a study of the typomorphic features of placer gold and its distribution patterns, the predicted gold potential of the east of the Siberian Platform is substantiated. The identified morphological and mineralogical–geochemical indicators in placer gold have made it possible to establish the genesis of placers (alluvial, aeolian, etc.) and predict the types of primary sources. Gold-bearing placers were formed from ore assemblages that do not form bed placers. This explains the noneconomic placers recommended for complex diamond, gold, and platinum mining. Detection of Witwatersrand-type gold-bearing conglomerates is problematic, since there are no geological prerequisites for their formation in a region. For the east of the Siberian Platform, the following assemblage types of primary gold sources have been identified: low-sulfidation gold–quartz, gold–iron–quartzite, gold–copper–porphyry, Precambrian gold–platinoid and gold–silver, gold–rare-metal, gold–sulfide–quartz of Mesozoic ore formation stages. All of these correspond to certain geological and structural positions, and their identification contributes to more correct selection of methods of prospecting for deposits. The predicted types of primary sources, except for gold–platinoid, are not associated with mafic magmatism. A new source of ore gold has been established in the ultramafic alkaline carbonatite complex of the Tomtor massif. Promising objects are Carlin-type gold–sulfide quartz ore occurrences, predicted in terrigenous carbonate sequences spatially confined to deep-seated faults, repeatedly rejuvenated in the Mesozoic–Cenozoic, as well as Cripple Creek–type gold–silver occurrences in the Vilyui and Udzha paleorifts, where andesite–dacite volcanism had occurred.

中文翻译：

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西伯利亚地台以东的含金砂矿组合：起源与前景

摘要

通过对砂金形态特征及其分布规律的研究，首次证实了西伯利亚台地东部的黄金潜力预测。砂金中已确定的形态学和矿物学地球化学指标使确定砂金的成因（冲积、风成等）和预测主要来源的类型成为可能。含金砂矿是由不形成床砂矿的矿石组合形成的。这解释了推荐用于复杂钻石、黄金和铂金开采的非经济砂矿。检测威特沃特斯兰德型含金砾岩是有问题的，因为它们在一个地区的形成没有地质先决条件。对于西伯利亚地台以东，已确定以下组合类型的原生金源：低硫化金-石英、金-铁-石英、金-铜-斑岩、前寒武纪金-铂和金-银、金-稀有金属、金-硫化物-石英等中生代成矿阶段。这些都与一定的地质构造位置相对应，它们的识别有助于更正确地选择找矿方法。除金-铂类外，预测的主要来源类型与镁铁质岩浆作用无关。在 Tomtor 地块的超镁铁质碱性碳酸岩杂岩中建立了新的金矿来源。有希望的对象是卡林型金硫化物石英矿，预测在空间上局限于深部断层的陆源碳酸盐序列中，在中生代 - 新生代反复恢复活力，