Тип публикации: статья из журнала

Год издания: 2014

Идентификатор DOI: 10.1016/j.rgg.2014.03.005

Ключевые слова: Bottom sediments, Carbonates, Geochemistry, Holocene, IR spectroscopy, Paleoclimate, Saline lake, Stable isotopes, Western Transbaikalia, XRD analysis, carbonate, crystal chemistry, dolomite, geological record, hydrogeochemistry, infrared spectroscopy, mineralogy, sediment chemistry, stable isotope, X-ray diffraction, Buryatia, Russian Federation, Transbaikalia

Аннотация: We present results of research into the Holocene sediments of Lake Kiran, one of the small saline lakes with carbonate sedimentation in western Transbaikalia. The sediments were studied by X-ray diffraction (XRD) analysis, IR spectroscopy, analysis of stable O and C isotopes, laser granulometry, element analysis (SRXFA), etc. By thПоказать полностьюe mathematical modeling of complex XRD patterns of lacustrine sediments, Mg-calcites with different Mg contents and excess-Ca dolomites have been determined in the assemblage of endogenic carbonate minerals.The obtained carbonate record gives an insight into the stratigraphic distribution of endogenic carbonates of the calcite-dolomite series, in which the number and proportion of phases with different Mg contents are determined by the Mg/Ca ratio, salinity, and total alkalinity of the lake water in the past. The abundance of excess-Ca dolomites in the sediments indicates that the lake is of shallow playa type. The mineral composition and crystallochemical structure of carbonates are in high correlation with the data of lithological analysis, results of determination of stable isotopes (518O and 513C), and distribution of some geochemical indicators of sedimentation conditions. Several stages of the lake evolution depending on the regional climatic changes have been recognized. It has been established that the most arid conditions in southern Buryatia were in the Subatlantic. Despite the highly arid climate in the region in the period under study (from 7ka to the present), it underwent fluctuations toward humidification, in particular, at the Atlantic stage (the time of the lake formation) and in the recent decades, up to the present. © 2014.

Журнал: Russian Geology and Geophysics

Выпуск журнала: Vol. 55, Is. 4

Номера страниц: 472-482

• Solotchina E.P. (V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russian Federation)
• Sklyarov E.V. (Institute of the Earth's Crust, Siberian Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russian Federation, Far Eastern Federal University, ul. Sukhanova 8, Vladivostok, 690950, Russian Federation)
• Solotchin P.A. (V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russian Federation)
• Vologina E.G. (Institute of the Earth's Crust, Siberian Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russian Federation)
• Sklyarova O.A. (A.P. Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, ul. Favorskogo 1a, Irkutsk, 664033, Russian Federation)

• Scopus