Известия Томского политехнического университета: Инжиниринг георесурсов (May 2022)
HYDROGEOLOGICAL CONDITIONS OF DEVELOPMENT AND HYDROGEOCHEMISTRY OF DRAINAGE WATER OF THE BOROK GRANITE QUARRY
Abstract
The relevance of the study is determined by the need for a modern assessment of the hydrogeological conditions of development and hydrogeochemistry of drainage waters of the Borok granite quarry, located within the boundaries of a large Siberian metropolis - the city of Novosibirsk. The aim of the research is to study the features of the chemical composition and evaluate the annual volumes of uranium and thorium carried out by drainage waters. Methods. Sampling was carried out in accordance with generally accepted methods. Laboratory study of the chemical composition by titrimetry, ion chromatography, inductively coupled plasma mass spectrometry was carried out at the Problem Research Laboratory of Hydrogeochemistry of the TPU School of Natural Resources. Results. During 2019–2021, the study of the geochemical features of the drainage waters of the Borok granite quarry and the Inya River (above and below the drainage water discharge site) was carried out. The data on water inflows for the last 70 years are summarized and the role of the main aquifers and atmospheric precipitation in the watering of the quarry during the year is substantiated. The hydrogeochemical features of the quarry drainage waters were revealed, including the distribution of a wide range of chemical elements (from Li to U). Waters are characterized by Cl-SO4-HCO3 Na-Mg-Ca and SO4-HCO3 Na-Mg-Ca composition with TDS from 572 to 697 mg/dm3 and the content of silicon from 0,89 to 10,53 mg/dm3. The environmental parameters correspond to oxidizing geochemical environment with pH values from 7,6 to 8,5; Eh from +150,2 to +261,0 mV and O2dissolved from 3,6 to 11,5 mg/dm3. The contents of natural radionuclides are (mg/dm3): 238U (9,3∙10–3–0,2), 232Th (1,0∙10–6–9,6∙10–5). The activity of radon (222Rn) varies from 1 to 89 Bq/dm3.
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