TY - JOUR

T1 - The spatio-temporal distribution of elements in the bottom sediments of Lake Onego and small lakes located on the catchment area of Onego Ice Lake

AU - Strakhovenko, Vera D.

AU - Belkina, Natalia A.

AU - Efremenko, Natalia A.

AU - Potakhin, Maxim S.

AU - Subetto, Dmitry A.

AU - Malov, Viktor I.

AU - Ovdina, Ekaterina A.

N1 - The research was supported by the RFBR project No. 19-05-50014 (study of mineral and geochemical composition of sedimentary material and bottom sediments) and was done on state assignment of IGM SB RAS (№ 122041400193-7) (estimation the rates of modern sedimentation by the activity of137Cs and 210Pb), state assignment to the HSPU of Russia No. VRFY-2023-0010 of the Ministry of Education of the Russian Federation state assignment to the NWPI KarRC RAS No. 0185-2021-0006 (fieldwork on the bottom sediments sampling and the study of their composition). Публикация для корректировки.

PY - 2023

Y1 - 2023

N2 - The work presents the results of a comprehensive mineralogical and geochemical study of Late Pleistocene-Holocene bottom sediments of Lake Onego and small lakes located in the territory belonging to Onego Ice Lake. Methods of ICP-MS, atomic absorption spectrometry, X-ray fluorescence analysis, X-ray phase method (XRD), scanning electron microscopy (SEM), and gamma-spectrometric method were used. The geochemical composition of the terrigenous fraction reflects the mineral composition and is permanent for the all bottom sediments cores of Lake Onego and small lakes during time interval about 12,000 years. For the first time, detailed mineralogical studies of sediments have shown that the composition of mineral associations of the terrigenous fraction is similar in the bottom sediment cores of Lake Onego and small lakes. The association of authigenic minerals in bottom sediments is distinguished by the presence of pyrite framboids in small lakes, and crystalline aggregates of Fe-phosphate, ferruginous illites and chlorites in Lake Onego. Sedimentation rates established by the study of correlations the indicator technogenic radioisotope 137Cs and atmospheric 210Pb. In the bottom sediments of small lakes, sedimentation rates vary from lake to lake, as well as in various areas of Lake Onego in the range from 0.05 cm/year to 0.30 cm/year.

AB - The work presents the results of a comprehensive mineralogical and geochemical study of Late Pleistocene-Holocene bottom sediments of Lake Onego and small lakes located in the territory belonging to Onego Ice Lake. Methods of ICP-MS, atomic absorption spectrometry, X-ray fluorescence analysis, X-ray phase method (XRD), scanning electron microscopy (SEM), and gamma-spectrometric method were used. The geochemical composition of the terrigenous fraction reflects the mineral composition and is permanent for the all bottom sediments cores of Lake Onego and small lakes during time interval about 12,000 years. For the first time, detailed mineralogical studies of sediments have shown that the composition of mineral associations of the terrigenous fraction is similar in the bottom sediment cores of Lake Onego and small lakes. The association of authigenic minerals in bottom sediments is distinguished by the presence of pyrite framboids in small lakes, and crystalline aggregates of Fe-phosphate, ferruginous illites and chlorites in Lake Onego. Sedimentation rates established by the study of correlations the indicator technogenic radioisotope 137Cs and atmospheric 210Pb. In the bottom sediments of small lakes, sedimentation rates vary from lake to lake, as well as in various areas of Lake Onego in the range from 0.05 cm/year to 0.30 cm/year.

KW - 137Cs

KW - 210Pb

KW - Lake Onego

KW - Onego Ice Lake

KW - bottom sediments

KW - geochemistry

KW - mineralogy

KW - sedimentation rate

KW - small lakes

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85179938349&origin=inward&txGid=df0dc12cd57cbf9124ea9815839d7abe

UR - https://www.mendeley.com/catalogue/f135752d-3f75-3911-8288-337eb886eee0/

U2 - 10.21638/spbu07.2023.404

DO - 10.21638/spbu07.2023.404

M3 - Article

VL - 68

JO - Vestnik of Saint Petersburg University. Earth Sciences

JF - Vestnik of Saint Petersburg University. Earth Sciences

SN - 2541-9668

IS - 4

ER -