WANG Ning, LIU Weiguo, CHANG Hong, AN Zhisheng. EVOLUTIONARY PROCESS OF THE CLIMATE OF LOP NUR REGION OF XINJIANG SINCE MID-PLEISTOCENE[J]. Marine Geology & Quaternary Geology, 2009, 29(2): 131-137. DOI: 10.3724/SP.J.1140.2009.02131
Citation: WANG Ning, LIU Weiguo, CHANG Hong, AN Zhisheng. EVOLUTIONARY PROCESS OF THE CLIMATE OF LOP NUR REGION OF XINJIANG SINCE MID-PLEISTOCENE[J]. Marine Geology & Quaternary Geology, 2009, 29(2): 131-137. DOI: 10.3724/SP.J.1140.2009.02131

EVOLUTIONARY PROCESS OF THE CLIMATE OF LOP NUR REGION OF XINJIANG SINCE MID-PLEISTOCENE

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  • Received Date: October 12, 2008
  • Revised Date: January 11, 2009
  • Climate variability since the mid-Pleistocene is studied from the proxies in core LS2 drilled in the Lop Nur region (N39°46'39.3″, E88°23'18.2 ″) in the eastern Tarim basin, Xinjiang, China. Geochemical properties, including CaCO3 content, total organic carbon content (TOC) and total nitrogen content (TN), have been determined to reconstruct the environmental evolution of the area since the mid-Pleistocene. Change of sedimentary facies of Lop Nur region since the mid-Pleistocene is documented through the lithology of sediments. From bottom to top, the sedimentary facies of LS2 core can be classified into shallow lacustrine, shore-lacustrine, shallow lacustrine, shore-lacustrine and shore-lacustrine to aeolian deposites, with thickness of 12 m, 46 m, 11 m, 28 m and 18 m respectively. Evolutionary process of the climate can be divided into seven stages:Ⅰ(depth of 115~103 m), changing from warm-dry to cold-dry; Ⅱ (depth of 103~82 m), alternating between cold-wet and warm-dry; Ⅲ (depth of 82~67 m), relatively warm and dry; Ⅳ (depth of 67~57 m), relatively cold-wet; Ⅴ (depth of 57~46 m), relatively warm and dry; Ⅵ (depth of 46~18 m), three warm-dry climate fluctuations folded in the cold-wet climate background; Ⅶ (depth of 18~0 m), intensified arid. This study shows that the sedimentary environment is dominated by shallow lacustrine to shore-lacustrine facies during mid-Pleistocene, while mainly aeolian deposits since the late Pleistocene. The hydrothermal characteristics of climate mainly have been following the form of "cold wet-warm dry" in the region since mid-Pleistocene.
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