Abstract

The coastal-marine rare metal–titanium placers of the West Siberian megaprovince were formed in a relatively short Eocene–Late Oligocene interval. A similar formation mechanism and commonality of primary sources of ore matter were responsible for the single type and similarity of mineral composition of placers in the megaprovince. Based on the comparison of various characteristics of these placers, common factors determining their industrial value were identified: the structural plan and tectonic movements of the platform basement governed the facies zonation, and lithological and technological characteristics of placer components and host rocks; and postdepositional tectonic processes influenced the position (depth) of placers in the sedimentary cover and the characteristics of ore sands (degree of their secondary supergene alterations). The geological factors, which make it possible to predict mining parameters of placers, technological characteristics of ore sands, quality of mineral concentrates, and geoeconomic indicators of the rare metal–titanium placer deposits, are defined.

中文翻译：

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西西伯利亚大省的稀有金属钛矿床的成因，矿物组成特征和发展中的问题

摘要

西西伯利亚大省的沿海海洋稀有金属-钛砂矿形成于相对较短的始新世-晚渐新世间隔。相似的形成机制和主要的矿物质来源共同导致了大省砂矿的单一类型和相似性。通过比较这些砂矿的各种特征，确定了决定其工业价值的共同因素：平台地下室的构造计划和构造运动控制着相带的划分，砂矿成分和母岩的岩性和工艺特征；沉积后的构造过程影响了砂矿中沉积物的位置（深度）和矿砂的特征（其次生超生改变的程度）。