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| Lake Status and Palaeoclimate in Jilantai Salt Lake Area during the Last Glacial Maximum |
| Jia Wanna1,2,3, Huang Xiaozhong1,2,3, Fan Yuxin1,2,3, Peng Wei1,2,3, Liu Sisi1,2,3, Chen Fahu1,2,3 |
1. MOE Key Laboratory of Western China's Environmental Systems, Lanzhou University, Lanzhou 730000, China;
2. Research School of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, China;
3. College of Geology and Resources, Lanzhou University, Lanzhou 730000, China |
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Abstract This study is trying to reconstruct the lake status and regional palaeoclimate character based on XRD data and Pediastrum algae from the core JLT11-A of Jilantai Salt Lake during the Last Glaical Maximum (LGM). The result suggested that the main minerals of the sediments were clastics (~85%) dominated by Quartz and Albite and about 10% of carbonates (mainly calcite), and both of them could be transported from land by strong winds, thus indicated a cold-dry climate as other palaeoclimatic records suggested. Although the sum of Chloride and sulfate minerals were generally less than 5%, its continuous appearance of Chloride suggested a basically high salinity. Therefore, the Pediastrum was not possible from the lake, but was transported by rivers. Mineral assemblage of Jilantai Lake is more connected with terrestrial material input and it is difficult to directly trace the lake water salinity. By comparing to the other records from neighboring regions, the LGM summer precipitation was higher than deglaciation period, while, it was lower comparing to the late MIS3 stage. The pattern of Jilantai Salt Lake evolution from LGM to the Last Deglaciation suggested that the mineral assemblage variations and lake status were strongly affected by the summer insolation, global and regional temperature, and Asian summer monsoon intensity.
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Received: 02 March 2015
Published: 20 May 2015
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2015, Vol. 35 
