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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (4): 1019-1026    DOI: 10.7522/j.issn.1000-694X.2013.00144
Paleoclimate and Environment Evolution     
Distribution Characteristics and Environmental Significances of Biomarker in Paleolake Sediments of Arid Basin: A case study in the Qaidam Basin
PU Yang1, ZHANG Hu-cai2, CHEN Guang-jie2, ZHANG Wen-xiang2, CHANG Feng-qin2,  ZHANG Shu-ping2
1.School of Remote Sensing, Nanjing University of Information Science & Technology, Nanjing 210044, China;
2.College of Tourism and Geography Sciences/Key Laboratory of Plateau Lake Ecology and Global Change, Yunnan Normal University, Kunming 650500, China
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Abstract  

In Qaidam Basin, a large area of paleolake sediments was exposed to the surface and received strong weathering over time. The weathering products are considered to be a main material source of the aeolian deposits. The biomarker could be well preserved in the sediments in certain circumstances and documented the paleoenvironmental variations. By using the conventional gas chromatography-mass spectrometry (GC-MS) method, the samples collected from the shell bar profile, Qarhan salt lake of Qaidam Basin in northeastern Tibetan Plateau were determined. A series of biomarkers were identified from these lacustrine deposits, mainly including n-alkanes, branch alkanes, n-alkan-2-ones, n-alkanoic acids, alkanol, alkyl amide, ester, triterpenoids and steroids, indicative of various biogenic contributions. The high odd-carbon predominance of n-alkane homologous and the presence of non-hopanoid pentacyclic triterpenoid represent amount of allochthonous terrestrial plant materials were introduced to the lake sediments in Qarhan paleolake, indicating the wet climate and resulted in the plants to flourish in the period in which the lake sediments formed, which is very different with the modern environment in Qaidam Basin.

Key words:  Qaidam Basin      Qarhan salt lake      paleolake sediment      biomarker      paleoenvironment     
Received:  31 May 2012      Published:  02 July 2012
ZTFLH:  P593  

Cite this article: 

PU Yang1, ZHANG Hu-cai2, CHEN Guang-jie2, ZHANG Wen-xiang2, CHANG Feng-qin2, ZHANG Shu-ping2. Distribution Characteristics and Environmental Significances of Biomarker in Paleolake Sediments of Arid Basin: A case study in the Qaidam Basin. JOURNAL OF DESERT RESEARCH, 2013, 33(4): 1019-1026.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00144     OR     http://www.desert.ac.cn/EN/Y2013/V33/I4/1019

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