Oxygen isotopic composition of boron minerals from kurchatovite-sakhaite ores of the Solongo deposit

Earth sciences and subsoil use Pub Date : 2022-06-30 DOI:10.21285/2686-9993-2022-45-2-104-118

S. Y. Izbrodina, V. F. Posokhov

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Abstract

The Solongo boron-magnetite skarn deposit (Western Transbaikalia, Russia) features industrial reserves of rare kurchatovite-sakhaite ores. The purpose of the work is to study the oxygen isotopic composition of boron-bearing minerals from the kurchatovite-sakhaite ores of the deposit. The samples were studied using modern methods of electron microscopy, mass spectrometry. The original photographs of transparent thin sections and images of the samples in backscattered electrons show mineral associations of sakhaite and kurchatovite icluding polymineral szaibeliite-sibirskite-calcite aggregate, roweite, fedorovskite, ludwigite, forsterite, serpentine, titanite, sphalerite, magnetite, jacobsite, apatite, turneaureite. The evolution of the Solongo deposit boron minerals is described. The following indicators of the oxygen isotopic composition δ18О v-SMOW in minerals have been obtained: sakhaite – +1 ‰, roweite – +2.7 ‰, kurchatovite – +1.9 ‰, magnetite – -0.3 ‰. The comparison of isotopic data on sakhaite with the available literature data has shown that the sakhaite of Solongo boron ores has a relatively light oxygen composition. The indicators obtained are attributed to the participation of meteoric waters including melt waters of firn basins and permafrost, in the formation process of the deposit, as well as reduced index of the oxygen isotope composition δ18O of the dolomites of the Ozerninsky ore cluster, whose transformation is associated with the sakhaite formation.

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索隆戈矿床库辉石—库海石矿石中硼矿物氧同位素组成

位于俄罗斯外贝加尔西部的Solongo硼磁铁矿矽卡岩矿床具有稀有库辉石-库海石矿石的工业储量。研究了该矿床库辉石-库辉石矿石中含硼矿物的氧同位素组成。使用电子显微镜、质谱分析等现代方法对样品进行了研究。透明薄片的原始照片和样品的背散射电子图像显示，sakhaite和kurchatoite的矿物组合包括多矿物szaibelite -sibirskite-方解石集合体、菱辉石、fedorovskite、ludwigite、forsterite、蛇纹石、钛矿、闪锌矿、磁铁矿、jacobite、磷灰石、透辉石。介绍了索朗戈矿床硼矿物的演化过程。得到了矿物氧同位素组成δ18О v-SMOW指标:萨海石- +1‰，黄铁矿- +2.7‰，库长石- +1.9‰，磁铁矿- -0.3‰。通过与已有文献资料的比较，发现索隆戈硼矿库盐岩氧组分较轻。所获得的指标归因于矿床形成过程中有包括盆地融水和多年冻土带在内的大气水的参与，以及Ozerninsky矿群白云岩氧同位素组成δ18O的降低指数，其转化与sakhaite的形成有关。

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Earth sciences and subsoil use

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