Open AccessPetrogeochemical and isotopic characteristics, connection with magmatism of tungsten deposits of Aginskaya and Argunskaya structural-formation zones of the Eastern Transbaikalia
Author(s) -
Б. Н. Абрамов,
В. Ф. Посохов
Publication year - 2021
Publication title -
litosfera
Language(s) - English
Resource type - Journals
eISSN - 2500-302X
pISSN - 1681-9004
DOI - 10.24930/1681-9004-2021-21-2-262-272
Subject(s) - tungsten , geology , geochemistry , ilmenite , chemical composition , magmatism , quartz , mineralogy , magnetite , chemistry , metallurgy , materials science , paleontology , organic chemistry , tectonics
Research subject . Tungsten deposits of the Aginsky and Argunsky structural-formation zones in the Eastern Transbaikalia. The aim was to clarify the sources and conditions for the formation of tungsten mineralisation, as well as to clarify a relationship between magmatism and tungsten mineralisation. The conditions of deposit formation were studied using data on the chemical composition of rocks and ores and the oxygen isotopic composition of the ore veins of tungsten deposits. Methods. The elemental composition of rocks was determined by the methods of X-ray fluorescence and standard chemical analysis; the concentration of rare-earth elements was determined by sorption-atomic emission analysis with inductively coupled plasma (Geological Institute SB RAS, Ulan-Ude). The examination of oxygen isotope composition was carried out at the Geological Institute of SB RAS (Ulan-Ude) using a MIR 10-30 system of laser heating with a 100W CO 2 laser and 10.6 microns wavelength in the infrared region in the presence of a BrF 5 reagent (analyst V.F. Posokhov). Results and conclusions . It was established that granites in the Kukulbey complex of the Antonovogorsky and Bukukinsky tungsten deposits correspond to granites of an ilmenite series, while the ores in the Spokoininsky deposit are associated with the granites of a magnetite series. A close correlation was established between W with Ta, Nb, Hf and As, indicating similar compositions of ore-bearing sources of the tungsten deposits. For Barun-Shiveinsky, Antonovogorsky and Bukukinsky deposits, the oxygen isotope compositions in the fluid in equilibrium with quartz of the productive stage was calculated, indicating the magmatic sources of mineralisation.