Abstract

Plagioclases from gabbroids of the Kharaelakh intrusion on the western flank of the Oktyabr’skoye deposit were studied using infrared spectroscopy. An analysis of 130 Fourier IR absorption spectra of plagioclases indicates a regular compositional change in the isomorphic series from andesine (1150 and 1096 cm^–1) to anorthite (1142 and 1275 cm^–1) depending on the degree of rock differentiation in the intrusion. The data of IR spectroscopy were verified by control X-ray microanalysis of the chemical composition. The Fourier IR spectra indicate that andesine is associated with olivine-bearing and olivine gabbro–dolerite. Anorthite is evenly distributed in gabbro–dolerite, but predominates in leucocratic gabbro. Analysis of Fourier IR spectra indicated the presence of iron and potassium among the impurities in the structure. Fe³⁺ was recorded among the minor elements in plagioclases in the rocks confined to the intervals of ore disseminated mineralization (chalcopyrite, pyrrhotite, and pentlandite), such as picritic gabbro–dolerite, by absorption bands at 1580–1644 cm^–1. The new data we obtained is of great mineralogical significance. The revealed regularities in the distribution of minor elements in the section of ore and barren differentiates are recommended for use in the practice of geological exploration.

中文翻译：

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Oktyabr'skoe 矿床西侧斜长石成分的新数据：来自红外光谱数据的证据

摘要

使用红外光谱研究了 Oktyabr'skoye 矿床西侧 Kharaelakh 侵入体的斜长石的斜长石。斜长石的 130 傅里叶 IR 吸收光谱分析表明，从长石（1150 和 1096 cm ^–1）到钙长石（1142 和 1275 cm ^{–1 ）的同晶系列有规律的组成变化}) 取决于侵入体中岩石的分化程度。红外光谱数据通过化学成分的对照 X 射线微量分析得到验证。傅里叶红外光谱表明，长石与含橄榄石和橄榄石辉长岩-玄武岩有关。钙长石均匀分布于辉长岩-辉长岩中，但以白质辉长岩为主。傅里叶红外光谱分析表明在结构中的杂质中存在铁和钾。^{通过 1580-1644 cm -1}的吸收带， Fe ³⁺记录在局限于矿石浸染矿化层段（黄铜矿、磁黄铁矿和镍黄铁矿）的岩石中斜长石的微量元素中，如苦碱辉长岩-辉绿岩. 我们获得的新数据具有重要的矿物学意义。建议将所揭示的矿石和贫瘠区微量元素分布规律应用于地质勘查实践。