外贝加尔地区乌多坎沉积盆地的碎屑铬尖晶石

IF 1.2 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Russian Geology and Geophysics Pub Date : 2023-12-12 DOI:10.2113/rgg20234632

K. Novoselov, E. Belogub, I. Blinov, D. A. Artem’ev

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引用次数: 0

摘要

--乌道馆沉积盆地是一个独特的地质结构，其中有许多铜石矿床和矿点。在 Udokan 和 Unkur 矿床的 Sakukan Formation 元砂岩中发现了一种分离铬尖晶石，这些元砂岩往往是天然重矿物精矿的夹层。这种矿物在磁铁矿晶体中形成孑遗包裹体。其成分的特点是含有高浓度的锌（氧化锌含量高达 11.62 wt.%）和锰（氧化锰含量高达 6.32 wt.%），几乎完全不含镁。与伴生磁铁矿相比，铬铁矿明显富含锗（高达百万分之 666）和镓（高达百万分之 59.1）。Zn-铬尖晶石的形成是在伴随富含吸附杂质的铁凝胶的沉积和结晶的特定化学过程背景下，在脱铬铁矿的转变过程中发生的。

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Detrital Chrome Spinels of the Udokan Sedimentary Basin in Transbaikalia

––The Udokan sedimentary basin is a unique geological structure containing many copperstone deposits and occurrences. A detrital chrome spinel is identified in the metasandstones of the Sakukan Formation at the Udokan and Unkur deposits, which tend to interlayers of natural heavy mineral concentrates. The mineral forms relict inclusions in magnetite crystals. Its composition is distinguished by high concentrations of zinc (up to 11.62 wt.% ZnO) and manganese (up to 6.32 wt.% MnO) with an almost complete absence of magnesium. In comparison with the associated magnetite, chromite is significantly enriched in germanium (up to 666 ppm) and gallium (up to 59.1 ppm). The formation of Zn-chrome spinel occurred during the transformation of detrital chromite against the background of specific chemical processes accompanying the deposition and crystallization of iron gel enriched with adsorbed impurities.

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来源期刊

Russian Geology and Geophysics 地学-地球科学综合

CiteScore

2.00

自引率

18.20%

发文量

审稿时长

4-8 weeks

期刊介绍： 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.