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《Acta Geographica Sinica》 2011-05
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New Findings and Dating of Lacustrine Sediments in the Xishanzui Subuplift, Hetao Basin

FAN Tianlai, FAN Yuxin, WEI Guoxiao (MOE Key Laboratory of West China's Environmental Systems, Lanzhou Universsity, Lanzhou 730000, China)  
A complete sedimentary profile composed mainly of typical lacustrine sediments including beachrock and cut-and-built platform located in the Xishanzui subuplift, Hetao Basin, has been found. The geomorphological and stratigraphic evidence indicates that there was a paleolake with its highest lake up to 1080 m a.s.l. Stratigraphic analysis of the profile indicates that this subuplift experienced an environmental change from a deep lake to a shallow lake and then to non-lake environment (suggested by alluvial/diluvial sediments). Optical dating results support that Xishanzui subuplift was actually covered by a deep water lake, potentially the Megalake"Jilantai-Hetao"at around 65 ka BP when the lake reached its highest level. And no lake level has exceeded the highest level inferred from sedimentary sequence in the profile.
【Fund】: 973项目(2010CB950202);; 国家自然科学基金项目(40972116)~~
【CateGory Index】: P597.3
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