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《Quaternary Sciences》 2008-04
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COMBINED CHARACTERISTIC OF TOTAL ORGANIC CARBON AND LIPID COMPOUNDS FROM MIDDLE HOLOCENE PEAT IN LANGMUSI,SOUTHERN GANSU

Zhou Jing① Zhang Pingzhong① Jia Jihong① Wang Zongli① Wang Yongli② Zhang Hong②Zhang Dezhong① Sang Wencui① Wu Xiuping① Wang Jianglin①(①Key Laboratory of Western China's Environmental System(Ministry of Education),College of Earth and Environment Science,Lanzhou University,Lanzhou730000;②Key Laboratory of Gas Geochemistry,Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou730000)  
The research area is located on the edge of the northeast Tibetan Plateau.The peat sampling site is in Langmusi County,with an altitude of 3559m(34°09' N,102°34' E).The core is 346cm long and sampled at 1cm intervals.We select the part which is all composed of peat(203-14cm),deposited during 7300-4000cal.aB.P.This peat sedimentary sequence was selectively investigated by lipid molecular stratigraphy by gas chromatography-mass spectrometer(GC-MS).A variety of molecular fossils are found in this peat profile,including n-alkanes,n-alkan-2-ones,fatty acid methyl esters,polycyclic aromatic hydrocarbons(PAH)and so on.The n-alkanes are ranged from C16-C33,having a maximum at C31(C25).They display a distinct odd/even carbon number predominance,having high CPI values(5).Distribution of fatty acid methyl esters from C16 to C30 was observed,maximizing at C24.The n-alkan-2-ones are ranged from C19 to C33,having a maximum at C23.We've also found phenznthrene series in the peat profile.Higher plants are the predominant source of the n-alkane compositions.Combining the distribution of lipids and types of vegetation in and near this area,we can conclude that the source are herbages.n-Alkan-2-ones are from epicuticular waxes of peat-forming plants or microbial cracking of longer-chain n-alkan-2-ones to yield the shorter chain components.Fatty acid methyl esters may be related to biochemical process.Phenznthrene series indicate low maturity of the peat profile.On the side,we also found pristane(Pr)and phytane(Ph)in the profile which show the peat of the Langmusi profile was formed in an anoxic deposit environment.The low methylphenanthrene index(MPI)and Rc values of phenznthrene series indicate the low thermal maturity of the samples.They also show that the samples were preserved well and could reflect the actual composition and features of the deposition,as well as the environment when they were deposited.Based on the establishment of a reliable AMS dating,we have been able to establish climate change series of the profile using the distribution patterns of the TOC during the Middle Holocene.From the distributed character of lipids in the selective samples which belong to different phases,the conclusion from TOC can be confirmed.We can also divide the climate series into three periods:7300-5500cal.aB.P.,5500-5000cal.aB.P.,and 5000-4000cal.aB.P.,all of the Middle Holocene.During those periods,there are three dry and cold events accompany.They are consistent with the results of other study in this area and around.
【Fund】: 国家自然科学基金项目(批准号:40471137和40672123);; 兰州大学交叉学科青年基金项目(批准号:LZU200533)共同资助
【CateGory Index】: P534.632
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