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The Characteristics of Organic Matter in Frozen Lake Sediments and Palaeoenvironmental Change of Qingshuihe in the Tibetan Plateau

LIN Qing, WANG Guo-shang (Lanzhou Institute of Glaciology and Geocryology, Chinese Academy of Sciences, Lanzhou Gansu 730000, China)  
The organic matter in frozen lake sediments of the Tibetan Plateau mainly comes from submerged aquatic plants and plankton and is in a good state of preservation In this work, organic matter in core samples of frozen lacustrine sediments ranging from 50 to 400 cm has been studied systematically In this profile, the concentration of organic matter (Corg), hydrogen index (HI), concentration of soluble organic matter (SOM) and other parameters of the characteristics of organic matter have the same variation tendency The ratios of SOM/Corg and alkane/non hydrocarbon range from 5%~13% and 0 2~0 5 respectively These ratios, which can be regarded as the relative contribution of submerged aquatic plants and plankton, may provide the information of relative water depth of past lake The ratios of OEP and Pr/Ph range from 2 44~7 83 and 1 04~2 65 respectively These ratios indicate the surface of sediments rich in oxygen and are able to reconstruct the relative water depth of past lake
【Fund】: 国家自然科学基金 ;国家攀登计划 ;有机地球化学国家重点实验室课题
【CateGory Index】: P343.63
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