腾格里沙漠南缘土门剖面末次间冰期5e的主量元素特征及其记录的古气候

Abstract

Abstract: Situated in the interlaced belt between the desert and loess under control of the East Asia winter and summer monsoons,the Tumen section on the southern edge of the Tenger Desert is very sensitive to the global climate changes,and it is the ideal place to study paleoclimate and paleoecology. Through the field investigation, collecting samples and experiment of x-ray fluorescence spectroscopy,we chose the TMS5e segment in the Tumen section to discuss the paleo-climate changes during the MIS5e of the Last Interglacial. The TMS5e consists of 16 layers of aeolian dune sands,11 layers of loess and 5 layers of lacustrine facies. Based on the analysis of the major elements and ages of the TMS5e segmemt,we found 14.5 major elememt cycles that are similar to the sedimentary cycles. The contents of 8 major elements in the TMS5e display as SiO₂ >Al₂O₃ >CaO >TOFE >K₂O >MgO > Na₂O >TiO₂,ranging from 53.63 to 74.14%,8.32 to 12.98%,2.70 to 6.99%,2.5 to 5.80%,2.07 to 2.81%,1.22 to 3.47%,1.60 to 2.41%,and 0.24 to 0.60%,respectively,with the average of 64.11%,11.31%,5.15%,4.08%, 2.37%,2.26%,2.01%,and 0.41%,respectively. The curves of major elements within the TMS5e sequence vertically present symmetric changes:SiO₂ shows high peaks in the dune sands,but low values in the lacustrine and loess. the other element Al₂O₃,CaO,TOFE,K₂O,MgO,Na₂O and TiO₂ show the opposite trend,with low values in the dune sands and high peaks in the lacustrine and loess. It suggests that the climate is instable in the TMS5e in southern Tengger Desert during the MIS5e period,and it has experienced at least 14.5 warm-cold climate fluctuations. The TMS5e could be divided into five sub-stages:TMS5e5(139-129.3 ka BP),TMS5e4(129.3-124 ka BP),TMS5e3(124-119.5 ka BP),TMS5e2(119.5-116.5 ka BP),and TMS5e1(116.5-113.7 ka BP),which correspond to the MIS5e5-MIS5e1 in the GRIP ice core. This study helps us to further understand the paleo-climate variations on the marginal areas in the Northwest of China during the MIS5e,and provide geological evidence to support the climate instability in the MIS5e.

Key words: Tenger Desert, Tumen section, MIS5e, major element

CLC Number:

P532

SUN Ye-feng, WEN Xiao-hao, LI Bao-sheng, NIU Dong-feng, ZHAO Zhan-lun, MENG Jie, YANG Qin-jiang. Climate variability recorded by the major elements in the TMS5e of the Tumen section during the MIS5e in the southern Tengger Desert,northwest China[J]., 2015, 38(6): 1151-1160.

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Climate variability recorded by the major elements in the TMS5e of the Tumen section during the MIS5e in the southern Tengger Desert,northwest China

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