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Late Pleistocene/Early Holocene climate conditions of North Mongolia based on carbon and oxygen stable isotopes of Dood Lake sediments

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地球环境学报 2011年第1期 318-320页

作者： Narantsetseg ts tomurhuu D Oyunchimeg ts tuvshingargal B idermunkh t Krivonogov S Kuzmin Y Burr G Institute of Geology and mineral resources Mongolian Academy of Sciences Korean Institute of Geosciences and Mineral Resources Institute of geology and mineralogy SB RAS Physics Department University of Arizona

Lake Dood is a fresh water lake,remnant of a large glacial lake in the Darkhad *** Mongolia is located at the coordinate of 51°20’ N,99°23’E,in 1538 m a.s.l..the length of the lake is 7.5 km with mean width2.4 km（maximum width is 5.6 km）.Mean depth of the lake Dood is 4.7 m,but deepest point is 17 *** total area is about 41.3 km;.the climate of the Darkhad Basin is extremely continental with a mean annual temperature range of 40 ℃ and a mean annual precipitation of 300;00 ***,the lake Dood occupies a transition zone between mountain and forest steppe ecosystems to the south and the coniferous forests to the *** of its unique geographic location,this region is very sensitive to climate changes and ideal place for paleoclimate *** paper makes an attempt to reconstruct the paleoclimate changes in Early Holocene and Late Pleistocene based on results of isotope geochemistry analysis of the core 1,obtained from the Lake Dood in North Mongolia,during the Mongolian-Russian joint expedition in summer of *** core 1 with length of 645 cm was taken from northern part of the lake,at coordinates of 51°24’26.0 "N;99°19’ 30.7" *** depth is 3.5 *** cores were cut lengthwise and after lithological description,it had been subsampled in 2 cm *** water,organic matter and carbonate contents of sediments were determined by heating the selected 210 samples（approximately 5;0 cm intervals） at 105℃,550℃ and 1000℃,*** isotope ratios of carbon and oxygen on bulk carbonate in 160 sediment samples were determined on Finnigan Mat 252 mass spectrometer at Key laboratory of Lanzhou Institute of Geology,Chinese Academy of *** ratios are reported relative to the Pee Dee Belemnite（PDB） standard for carbon and oxygen isotope measurements on bulk CO,.Plant fragments,wood debris and shells from 11 samples from different horizons of core 1 were dated by using Accelerator Mass Spectrometry at the University of Arizon

关键词： Lake Late Pleistocene/Early Holocene climate conditions of North Mongolia based on carbon and oxygen stable isotopes of Dood Lake sediments

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Late Pleistocene and Holocene environmental changes from sediment records of the Lake Dood(Darhad Basin)in northern Mongolia

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地球环境学报 2011年第1期 321-321页

作者： Oyunchimeg ts Uugantsetseg B tomurhuu D Narantsetseg ts Krivonogov S idermunkh t Institute of Geology and Mineral Resources of the MAS Institute of Geology and Mineralogy of SB of RAS

the paper presents new results in geochemistry and diatoms analyses of the short sediment cores,obtained in 2005 from the Lake Dood(Darhad Basin).the names,length and locations of cores are as following;Core-1,613 cm,51°24’26.0 "N,99°19’30.7" E;Core-2,380 cm,50°23’43.4 "N,99°21’33.7" E;Core-3,150 cm,51°24’03.0 "N,99°21’17.07" *** core samples have been subjected to lithology description,determinations of water contents(WC%),organic matter,total organic carbon(tOC),total nitrogen(tN),C/N and total sulfur(tS) contents with aims of recording paleo-environmental changes in northern *** and organic matter were determined using drying oven and furnace,while total carbon(tC),total nitrogen(tN) and total sulfur(tS) contents were analyzed by Elemental Analyzer(Flash EA112 series CHNS-O).the diatom study shows that the sediments of the Dood Lake contain diatoms belonging to the 24 genus and 50 *** the lithology of the cores(from bottom to top) consists of alternations of sand,clayey silt,sandy silt and silty clayey units in accordance with visual lithology *** most full geochemistry analysis have been performed for Core-1 which has several age dating,and in accordance with those data the core covers about14400 a BP and upper 160 cm sediments belong to the Holocene,while lower part of the core sediments had been accumulated during the late *** here mainly concentrate on problems how the organic geochemistry contents and diatom abundances distribute along the cores,what information can be extracted from them,they are consistent or not with information got from other analysis *** tOC and tN contents in the Core-1 are very changeable from 1.32%to 6.59%and from 0.139%to 0.512%,*** wide variation in contents of the tOC and tN revealed for upper 300 cm of sandy silt and silty clayey units in comparison to the lower 300 cm where their contents are relatively uniform and *** this point of view,for core sed

关键词： Lake Darhad Basin)in northern Mongolia Late Pleistocene and Holocene environmental changes from sediment records of the Lake Dood

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