Abstract
The aim of the study is to clarify the mineral composition and determine the conditions of the formation of the quartz-hubnerite veins of the Inkur stockwork tungsten deposit (the Dzhidinsky ore field, South-Western Transbaikalia). The research methods include a mineralogical and petrographic description of the ore quartz-hubnerite veins; an electron microprobe analysis of the mineral associations; thermometry, cryometry, and Raman spectroscopy of the individual fluid inclusions in quartz, fluorite, hubnerite, and muscovite. The mineralogical and petrographic studies has made it possible to clarify the mineral composition of the Inkur deposit ores and determine the mineral paragenesis formation sequence. The fluid inclusion studies have established that the ore deposition was occurring in the relatively low-salinity (~5.7–14.6 wt. % eq. NaCl) homogeneous solutions due to a decrease of the temperature. The study of the salt composition of the solutions has identified Ca chloride as a prevailing component, with NaCl, KCl, and MgCl as admixtures. CO2 and N2 have been identified in the gas phase of inclusions. Two stages of mineral formation have been defined: high-temperature (≥300 °С) and low-temperature (≥2.00–300 °С). The conducted studies allow qualitative estimation of the chemical composition of the ore-forming solutions. It has been established that one of the main factors of the hubnerite deposition is a temperature factor.
Highlights
The aim of the study is to clarify the mineral composition and determine the conditions of the formation of the quartz-hubnerite veins of the Inkur stockwork tungsten deposit
The fluid inclusion studies have established that the ore deposition was occurring in the relatively low-salinity
The study of the salt composition of the solutions has identified Ca chloride as a prevailing component
Summary
2020;43(3):290306 песчаниками, сланцами, известняками, а также вулканитами основного и среднего состава. Интрузия представлена на поверхности многочисленными дайками преимущественно кислого состава и Первомайским штоком гранит-порфиров Образующие штокверк, залегают в кварцевых диоритах Модонкульского массива и частично – в метаморфизованных осадочно-вулканогенных породах хохюртовской свиты. 2, f), как правило, растет перпендикулярно от стенок к центральным частям, кроме этого встречаются и более редкие чешуйки мусковита в центральных частях прожилков. 2. Фотографии карьера, штокверка и рудных прожилков Инкурского вольфрамового месторождения:. A – Инкурский карьер; b – штокверковое оруденение в стенке Инкурского карьера; c – кварцевые прожилки с редкими зернами гюбнерита; d – богатый гюбнеритом кварцевый прожилок (образец Геологического музея Бурятского научного центра СО РАН); e – полированная пластина кварц-гюбнеритового прожилка с мусковитом в оторочках; f – кварцевый прожилок, обогащенный мусковитом в зальбандовых частях с редкими кристаллами гюбнерита, фото пластины Длина масштабной линейки – 1 см.
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