Open AccessOn the finding of zincohögbomite in the granite pegmatites of the Lipovskiy vein field (Middle Urals)
Author(s) -
А.В. Захаров
Publication year - 2020
Publication title -
izvestiâ uralʹskogo gosudarstvennogo gornogo universiteta
Language(s) - English
Resource type - Journals
eISSN - 2500-2414
pISSN - 2307-2091
DOI - 10.21440/2307-2091-2020-3-27-34
Subject(s) - pegmatite , tourmaline , magnetite , geology , mineral , chemical composition , electron microprobe , vein , mineralogy , geochemistry , chemistry , metallurgy , materials science , psychology , paleontology , organic chemistry , psychiatry
The relevance of the work is due to the need to study the mineralogy of granite pegmatites of the Lipovskiy vein field, a unique object that gave the world a large amount of crystal raw materials of colored tourmaline Purpose of the work: study of zincohögbomite found in granite pegmatites of the Lipovskiy vein field (Middle Urals). Research methodology: quantitative analysis of the chemical composition of magnetite was carried out using the X-ray spectral electron probe microanalyzer CAMECA SX 100 (The Zavaritsky Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences, Ekaterinburg). The chemical composition of zincohögbomite was determined using the Jeol JSM-6390LV scanning electron microscope with an INCA Energy 450 X-Max 80 energy dispersive attachment from Oxford Instruments (The Zavaritsky Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences, Ekaterinburg). Results. When studying the surface of magnetite crystals, pore spaces were found inlaid with flattened grains of an unknown mineral, mainly triangular, less often hexagonal, in shape, up to 2–3 microns in size. Based on the data on its chemical composition, this mineral was assigned to zincohögbomite. Based on crystallochemical calculations, it was found that the mineral corresponds to zincohögbomite-2H2S or zincohögbomite-8H according to the old classification. Conclusions. A new mineral was found for granite pegmatites of the Lipovskiy vein field – zincohögbomite-2H2S. It was found in the form of inclusions in magnetite individuals in common intragranite pegmatites. This is the second find of zincohögbomite in the Urals and, most likely, the first one in the world in granite pegmatites. The formation of zincohögbomite is associated with retrograde metamorphism of amphibolite facies, when primary spinels become unstable and decompose into several mineral phases. Zincohögbomite from Lipovskiy field was formed as a result of the decomposition of primary magnetite during the cooling of granite pegmatite.