TY - JOUR

T1 - Сomposition and mineralogy of granitoids of the Ob-Zaisan folded region in the context of the prediction of groundwater radioactivity

AU - Sukhorukov, V. P.

AU - Sukhorukova, A. F.

AU - Novikov, D. A.

AU - Derkachev, A. S.

N1 - Field and analytical work on the study of the chemical composition of natural waters was carried out with the financial support of the project of the Ministry of Science and Higher Education of the Russian Federation \u2116 FWZZ-2022-0014, and the analytical work on the study of mineralogical, petrographic, and geochemical features of the granitoids of the Ob-Zaisan folded region, with the support of the project \u2116 22-17-20029 of the Russian Science Foundation and the Government of the Novosibirsk region.

PY - 2024

Y1 - 2024

N2 - The presented research is carried out in continuation of the works connected with studying the nature of radioactivity of drainage waters of quarries of Novosibirsk region, performed by the Laboratory of Hydrogeology of Sedimentary Basins of Siberia, INGG SB RAS, which showed that the waters of granite quarries are characterized by significantly higher radioactivity, than waters of other host rocks. The results of detailed mineralogical and geochemical studies of granitoids of the Ob-Zaisan region within the Kolyvan-Tom folded system are presented for the first time. The relevance of the present study is determined by the previously obtained data on high concentrations of uranium, thorium, and radon in drainage water of quarries developed in this territory. The granitoids of the Priobsky (Obsky and Novosibirsk massifs) and Barlak complexes were studied. It was established that the rocks of the complexes differ significantly in the spectrum of accessory minerals, which acted as the concentrators of natural radioactive and rare-earth elements: in the Barlak, in addition to apatite, sphene, and zircon, typical for all phases of the intrusion, fluorite, topaz, rutile, and minerals enriched with rare-earth elements are found: monazite, xenotime, bastnesite, parisite, less often uraninite. It was shown that a wide range of mineral-concentrators of radioactive and rare-earth elements determines higher concentrations of radionuclides in groundwater of the Barlak granitoid complex. Maximum uranium concentrations are one order of magnitude and those of thorium are two orders of magnitude higher in the groundwater of the Barlak granitoid complex compared to those of the Priobsky granitoid complex. The following peak concentrations, mg / dm3, were established in the groundwater of the studied granitoid complexes:238U up to 1.40 and232Th up to 2.16 · 10–3. One can predict a high background of radionuclides in the groundwater of the Barlak and Priobsky granitoid complexes, within the ranges, mg / dm3:238U from 0.1 · 10–3 to 1.40 and232Th from 1 · 10–6 to 2.16 · 10–3. Radon222Rn activity in the groundwater ranges 1–50 Bq / dm3 in the contact zones of granitoids with different-aged sedimentary rocks to 600–5,000 Bq / dm3 in the areas of granitoids occurrence.

AB - The presented research is carried out in continuation of the works connected with studying the nature of radioactivity of drainage waters of quarries of Novosibirsk region, performed by the Laboratory of Hydrogeology of Sedimentary Basins of Siberia, INGG SB RAS, which showed that the waters of granite quarries are characterized by significantly higher radioactivity, than waters of other host rocks. The results of detailed mineralogical and geochemical studies of granitoids of the Ob-Zaisan region within the Kolyvan-Tom folded system are presented for the first time. The relevance of the present study is determined by the previously obtained data on high concentrations of uranium, thorium, and radon in drainage water of quarries developed in this territory. The granitoids of the Priobsky (Obsky and Novosibirsk massifs) and Barlak complexes were studied. It was established that the rocks of the complexes differ significantly in the spectrum of accessory minerals, which acted as the concentrators of natural radioactive and rare-earth elements: in the Barlak, in addition to apatite, sphene, and zircon, typical for all phases of the intrusion, fluorite, topaz, rutile, and minerals enriched with rare-earth elements are found: monazite, xenotime, bastnesite, parisite, less often uraninite. It was shown that a wide range of mineral-concentrators of radioactive and rare-earth elements determines higher concentrations of radionuclides in groundwater of the Barlak granitoid complex. Maximum uranium concentrations are one order of magnitude and those of thorium are two orders of magnitude higher in the groundwater of the Barlak granitoid complex compared to those of the Priobsky granitoid complex. The following peak concentrations, mg / dm3, were established in the groundwater of the studied granitoid complexes:238U up to 1.40 and232Th up to 2.16 · 10–3. One can predict a high background of radionuclides in the groundwater of the Barlak and Priobsky granitoid complexes, within the ranges, mg / dm3:238U from 0.1 · 10–3 to 1.40 and232Th from 1 · 10–6 to 2.16 · 10–3. Radon222Rn activity in the groundwater ranges 1–50 Bq / dm3 in the contact zones of granitoids with different-aged sedimentary rocks to 600–5,000 Bq / dm3 in the areas of granitoids occurrence.

KW - 222Rn

KW - 232 Th

KW - 238U

KW - Novosibirsk region

KW - Western Siberia

KW - granitoids

KW - groundwater

KW - mineral-concentrators of radioactive and rare-earth elements

KW - radionuclides

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85202883059&origin=inward&txGid=304ce8d84e26dfe1b6b576d79addd081

UR - https://www.mendeley.com/catalogue/b50a3c4a-7f2a-310f-a796-45200b8db5e6/

U2 - 10.17073/2500-0632-2024-01-208

DO - 10.17073/2500-0632-2024-01-208

M3 - Article

VL - 9

SP - 105

EP - 115

JO - Горные науки и технологии

JF - Горные науки и технологии

SN - 2500-0632

IS - 2

ER -