Abstract

In the Malo-Botuobinsky, Sredne-Markhinsky, and Ygyattinsky diamond-bearing areas of the Western Yakutian kimberlite province, the prerequisites and signs of scandium deposits in ancient weathering crusts overlying Lower Paleozoic rocks and associated with zones of ancient reservoir and soil oxidation. According to X-ray fluorescence and ICP MS analyses, in the Nakyn kimberlite field of the Sredne-Markhinsky diamond-bearing region, promising ore occurrences and scandium concentration halos have been established in clay deposits of redeposited weathering crusts of the Dyakhtar Formation of Late Triassic–Early Jurassic age. They are confined to the erosional surface of Lower Paleozoic carbonate rocks and Middle Paleozoic traps, with monzonite porphyries and kimberlites cutting through them, covered on top by a sedimentary cover of Jurassic terrigenous deposits. Concentration anomalies of scandium in clays of the Dyakhtar Formation are localized mainly in deluvial clay deposits of paleowatersheds and gravitate to the intersections of tectonic disturbances. The depth of their occurrence does not exceed 100 m, which is quite favorable for the extraction of scandium by borehole in situ leaching. Concentrations of scandium were detected at one of the sites before 262 g/t in Late Triassic weathering crust, including material from a Middle Paleozoic gabbro dike, as well as overlying colluvial clays of the Dyakhtar formations with a maximum of 462 g/t.

中文翻译：

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雅库特 Nakyn 金伯利岩田古代风化壳中的钪矿赋存情况

摘要

在西雅库特金伯利岩省的 Malo-Botuobinsky、Sredne-Markhinsky 和 ​​Ygyattinsky 钻石产区，下古生界岩石上覆的古代风化壳中钪沉积的先决条件和迹象与古代储层和土壤氧化区有关。根据 X 射线荧光和 ICP MS 分析，在 Sredne-Markhinsky 钻石产区的 Nakyn 金伯利岩田中，在晚三叠世 Dyakhtar 组再沉积风化壳的粘土矿床中发现了有前景的矿石矿点和钪富集晕。 ——侏罗纪早期。它们局限于下古生界碳酸盐岩和中古生界圈闭的侵蚀面，二长斑岩和金伯利岩穿过它们，顶部覆盖着侏罗纪陆源沉积物的沉积盖。Dyakhtar 组粘土中钪的浓度异常主要集中在古流域的洪积粘土矿床中，并倾向于构造扰动的交汇处。其赋存深度不超过100 m，非常有利于钻孔原地浸出钪的提取。在晚三叠世风化壳中的一处地点检测到钪浓度为 262 克/吨，其中包括来自中古生代辉长岩脉的物质，以及 Dyakhtar 地层的上覆崩积粘土，最高含量为 462 克/吨。