Abstract
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.
Highlights
Zincohögbomite is a rare mineral and has not been described in the Urals until recently
A quantitative analysis of the chemical composition of magnetite was carried out using the CAMECA SX 100 electron probe microanalyzer
If we compare the compositions of two typical zincohögbomites [10, 11], the mineral from Lipovskiy vein field according to the data of crystallochemical recalculations quite well corresponds to zincohögbomite-2N2S or zincohögbomite-8H according to the old classification
Summary
Zincohögbomite is a rare mineral and has not been described in the Urals until recently. In 2018, zincohögbomite was found in corundum-bearing plagioclasites of the Rai-Iz hyperbasite massif (Polar Urals) in cavities titanomagnetite segregations in association with rutile, ilmenite, and hercynite [3]. The present work describes the first finding of zincohögbomite in granite pegmatites of the Lipovskiy vein field. Granite pegmatites of the Lipovskiy vein field are located on the eastern slope of the Middle Urals (70 km northeast of Ekaterinburg and 2 km west of the Lipovskoe village). A well-known and abandoned deposit of silicate-nickel ores is associated with karst marbles and weathering crusts of serpentinites. Granite pegmatites are widespread within the Lipovskiy vein field and are usually represented by ordinary (intragranite), lithium-bearing, and desilicated types. The age of intragranite rare-metal pegmatites was determined in the range of 266.4 ± 2.6 Ma [6]
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