N. Astakhova, O. Kolesnik, A. S. Astakhov, X. Shi, L. Hu, A. Alatortsev
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引用次数: 0
Abstract
––We studied the distribution of gold, silver, and platinum group elements (Pd, Pt, Rh, Ir, and Ru) in two bottom sediment cores of the southern Chukchi Sea. It is shown that the Holocene pelite–silty sediments with an age of up to 4.0 ka BP are significantly enriched in these elements, except for Ru and Rh, relative to their clarkes. Native silver minerals were found in all samples by probe microanalysis, whereas gold minerals were revealed only in the surface layer of the sediment core closest to the Chukchi Sea coast. Multicomponent statistical analysis of the chemical composition and grain size of the sediments and the content of organic matter in them has led to the conclusion about the accumulation of clastogenic and chemogenic forms of precious metals. The abnormally high content of gold (0.3 ppm) in the recent sediments near the Chukchi Peninsula coast might be due to its additional removal from the continent as a result of the placer mining there.
--我们研究了楚科奇海南部两个海底沉积岩芯中金、银和铂族元素（Pd、Pt、Rh、Ir和Ru）的分布。结果表明，相对于其克拉克值，全新世年龄达 4.0 ka BP 的鲕粒沉积物中除 Ru 和 Rh 外，其他元素都明显富集。通过探针显微分析，在所有样本中都发现了原生银矿物，而只有在最靠近楚科奇海海岸的沉积岩芯表层才发现了金矿物。通过对沉积物的化学成分和粒度以及其中有机物含量进行多组分统计分析，得出了贵金属的沉积形式和化学形式的结论。楚科奇半岛海岸附近近期沉积物中黄金含量异常高（百万分之 0.3），这可能是由于在该地区进行块矿开采后，从大陆上移走了更多的黄金。
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The journal publishes original reports of theoretical and methodological nature in the fields of geology, geophysics, and geochemistry, which contain data on composition and structure of the Earth''s crust and mantle, describes processes of formation and general regularities of commercial mineral occurrences, investigations on development and application of geological-geophysical methods for their revealing. As to works of regional nature, accelerated publication are available for original papers on a variety of problems of comparative geology taking into account specific character of Siberia, adjacent Asian countries and water areas. The journal will also publish reviews, critical articles, chronicle of the most important scientific events, and advertisements.
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