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《Earth Science Frontiers》 2015-05
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Regional dust activity history during the past 45ka reflected by sensitive grain-size components in Lop Nur,Xinjiang

YANG Yi;WANG Rujian;LIU Jian;ZHAO Yue;YANG Zhenyu;WENG Chengyu;WANG Lei;GUO Sheng;ZHANG Taoliang;Institute of Geomechanics,Chinese Academy of Geological Sciences;Geological Publishing House;State Key Laboratory of Marine Geology,Tongji University;  
Core KY01 was recovered from the center of the New Lake district in the Lop Nur,northwestern China for paleoclimatic reconstruction.Two environmental sensitive grain-size components,3.5-6.2μm(component 1),20.7-63.4μm(component 2),and one less sensitive grain-size component,8.9-14.3μm(component 3)of its sediments at the depth of 0-8mwere identified by the mathematical method of grain-size classes vs.standard deviation values.The three components are sensitive to the relative distance between the core KY01 and the middle of the Lop Nur,sensitive to the regional dust activities,and sensitive to the ordinary dust input intensity,respectively.Combined with the sensitive grain-size component 2and five AMS14 C ages,a 45000-year dust activity history in Lop Nur area was reconstructed.The study shows that strong dust periods appeared at 44.7-44.5cal ka BP,44.2-44.0cal ka BP,41.4-38.8cal ka BP,38.4-37.4cal ka BP,36.4-36.1cal ka BP,34.8-34.5cal ka BP,33.5-32.9cal ka BP,32.5-32.2cal ka BP,31.9-31.5cal ka BP,29.9-29.5cal ka BP,25.6-12.3cal ka BP,and 8.9-7.8cal ka BP.These periods are consistent well with the cold events or cold episodes of the Northern Hemisphere that were reflected by the oxygen isotope record of the NGRIP ice core,etc.It shows that the dust activities in the Lop Nur area are closely related to cold dry climate triggered by global cooling events.
【Fund】: 地质力学研究所基本科研业务费项目(DZLXJK201211);; 国家自然科学基金青年基金项目(41201202);; 中国地质调查项目(12120113006200)
【CateGory Index】: P512.2;P425.55
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