| Инд. авторы: | Darin A., Kalugin I., Maksimova N.V., Markovich T., Rogozin D., Rakshun Y., Zizak I., Darin F, Sorokoletov D. |
| Заглавие: | Geochemical indicators of climate change in the annual layers of bottom sediment lake shira (South Siberia) |
| Библ. ссылка: | Darin A., Kalugin I., Maksimova N.V., Markovich T., Rogozin D., Rakshun Y., Zizak I., Darin F, Sorokoletov D. Geochemical indicators of climate change in the annual layers of bottom sediment lake shira (South Siberia) // International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM. - 2013. - P.637-642. - ISBN 9786197105032. - ISSN 1314-2704. |
| Внешние системы: | DOI: 10.5593/SGEM2013/BD4/S19.017; РИНЦ: 21907752; SCOPUS: 2-s2.0-84892501783; |
| Реферат: | eng: The bottom sediments of the meromictic lake Shira have annually laminated layers with thickness of 0.5 - 2.0 mm. A sediment column of 155 cm in length was retrieved by hammer corer in the deepest (24 m) central part of the lake. Solid samples were prepared from the wet cores by freeze drying and impregnating with epoxy resin. The inter annual and inter seasonal variations in the trace element composition of annual layers are studied by means of X-ray scanning microanalysis with synchrotron radiation on the VEPP-3 (Novosibirsk) and BESSY-II (Berlin) storage rings. Profiles of minor element distribution were obtained for K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Ga, As, Br, Rb, Sr, Y, Zr and Nb along the upper 180 mm of bottom sediments with a spatial resolution from 100 to 20 μm, using excitation energies of 12 and 20 keV. Were found geochemical indicators marking the beginning (Ca/Sr ratio) and end (Br/Rb ratio) of the annual cycle of sedimentation. Detailed experimental investigations of the internal structure of annual layers allowed us to create a lithological-geochemical model of sedimentation in Lake Shira, and to find climatically correlated minor elements. This model of the annual cycle of sedimentation was used to explain the periodic white layers with high Sr contents in the core. Thick 3-5 cm light carbonate Sr-enriched intervals correspond to an extremely low level of the lake and are repeated every 450-550 years. © SGEM2013 All Rights Reserved by the International Multidisciplinary Scientific GeoConference SGEM. |
| Ключевые слова: | Zirconium; Titanium; Strontium; Sedimentation; Lithology; Lakes; Geochemistry; Exhibitions; Epoxy resins; Climate models; Climate change; Bromine; Sediments; Trace element composition; Seasonal variation; Late Holocene; Internal structure; Geochemical indicators; Experimental investigations; Bottom sediments; Scanning X-ray fluorescence; Late holocene; Gochemical indicators; Climate change; Annually laminated bottom sediments; X ray fluorescence; |
| Издано: | 2013 |
| Физ. характеристика: | с.637-642 |
| Конференция: | Название: 13th International Multidisciplinary Scientific Geoconference and EXPO, SGEM 2013 Даты проведения: 2013-06-16 - 2013-06-22 |