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Indicators of Oxic and Anoxic Conditions in the System of the Current Sedimentation of Saline Lake Shira (Khakassia), According to High-Resolution SR XRF Data on Bottom Sediments Frozen In Situ / I. A. Kalugin [et al.] // Bull. Russ. Acad. Sci. Phys. - 2019. - Vol. 83, Is. 2. - P198-203, DOI 10.3103/S1062873819020163 . - ISSN 1062-8738
Кл.слова (ненормированные):
Fluorescence -- Geochemistry -- Lakes -- Lithology -- Terahertz waves -- X rays -- Annual variations -- Anoxic conditions -- Bottom sediments -- Geochemical indicators -- Hydrological regime -- Quantitative estimates -- Terahertz radiation -- X ray fluorescence -- Oxic sediments
Аннотация: Abstract: Frozen upper layers of the bottom sediment of Lake Shira are selected using special sampling equipment. Frozen samples and solid samples prepared from the upper layers of a sediment core are examined by means of X-ray fluorescence at the Local and Scanning X-Ray Fluorescence Elemental Analysis Station of the Siberian Synchrotron and Terahertz Radiation Center’s Shared Resource Center. Analytical data on the initial frozen and processed solid samples demonstrate the good repeatability of the results. Quantitative estimates of the sedimentation regimes are obtained, and geochemical indicators of the change in redox conditions are determined from the analysis data. Lithological and geochemical records are synchronized with regional seasonal and annual variations in weather and climate, and with the hydrological regime of the lake for the last 50 years. © 2019, Allerton Press, Inc.

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Держатели документа:
Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russian Federation
Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russian Federation
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Kalugin, I. A.; Darin, A. V.; Babich, V. V.; Markovich, T. I.; Rakshun, Y. V.; Darin, F. A.; Sorokoletov, D. S.; Rogozin, D. Y.

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Geochemical Features of Annual Layers of Bottom Sediments of Freshwater Lakes, Studied via Synchrotron Radiation–Induced XRF Microanalysis / A. V. Darin [et al.] // Bull. Russ. Acad. Sci. Phys. - 2019. - Vol. 83, Is. 11. - P1437-1440, DOI 10.3103/S106287381911008X . - ISSN 1062-8738
Кл.слова (ненормированные):
Catchments -- Geochemistry -- Lakes -- Lithology -- Microanalysis -- Synchrotron radiation -- Synchrotrons -- Bottom sediments -- Extraterrestrial origin -- Fresh water lakes -- Geochemical features -- Geochemical indicators -- Lake sediments -- Layer boundaries -- Micro-particles -- Sediments
Аннотация: Abstract: The possibility of distinguishing layer boundaries through lithological and geochemical indicators (Rb/Sr ratio) is shown by a case study of bottom sediments from Lake Kucherlinskoe (Altai). Based on the data from scanning synchrotron radiation–induced XRF microanalysis and isotope studies, a record of the Tunguska event of 1908 is found in the bottom sediments of Lake Zapovednoye, forty kilometers from the explosion’s epicenter. An anomalous layer in the sediments is associated with an increase in the terrigenous drift in the catchment area due to massive forest outfall and subsequent fires. The possibility of a targeted search for microparticles of extraterrestrial origin in lake sediments is demonstrated. © 2019, Allerton Press, Inc.

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Держатели документа:
Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russian Federation
Institute of Biophysics, Krasnoyarsk Science Center, Siberian Branch, of Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Tungusky State Nature Reserve, Vanavara, 648490, Russian Federation
Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Science, Novosibirsk, 630090, Russian Federation

Доп.точки доступа:
Darin, A. V.; Babich, V. V.; Kalugin, I. A.; Markovich, T. I.; Rogozin, D. Y.; Meidus, A. V.; Darin, F. A.; Rakshun, Y. V.; Sorokoletov, D. S.

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