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Optical dating of the high lake level events documented in the core drilled in the Dengkou Subuplift within the huge Jilantai-Hetao Basin
ZHANG Fu 1 #,FAN Yuxin 2 *,CHEN Xiaolong 1,ZHANG Fan 1,LIU Wenhao 1,WANG Jin 1
1.School of Earth Sciences & Key Laboratory of Mineral Resources in Western China (Gansu Province) Lanzhou University, Lanzhou 730000, China
2.School of Earth Sciences & Key Laboratory of Mineral Resources in Western China (Gansu Province) Lanzhou University, Lanzhou 730000, China; MOE Key Laboratory of Western China’s Environmental Systems, Collaborative Innovation Centre for Arid Environments and Climate Change, Lanzhou University, Lanzhou 73000, China
*Correspondence author
#Submitted by
Subject:
Funding: the program for New Century Excellent Talents in University (No.No. NCET-12-0251), the National Natural Science Foundation of China (No.No. 41172163, 41371033), the Fundamental Research Funds for the Central Universities (No.No. LZUJBKY-2013-K17)
Opened online:30 June 2014
Accepted by: none
Citation: ZHANG Fu,FAN Yuxin,CHEN Xiaolong.Optical dating of the high lake level events documented in the core drilled in the Dengkou Subuplift within the huge Jilantai-Hetao Basin[OL]. [30 June 2014] http://en.paper.edu.cn/en_releasepaper/content/4602039
 
 
Dengkou Subuplift is a sensitive area to lake level changes of the close neighboring Jilantai Subdepression within the Jilantai-Hetao Basin. The entire stratigraphic sequence of the core DK12 drilled on the Dengkou Subuplift revealed that the present sandy land in the area of the Subuplift Dengkou was evolved from a shallow lake with several cycles of regression and transgression. OSL dating results indicate that the Dengkou Subuplift was once covered by a lake during three intervals, such as sometime prior to 76 ka, 52-39 ka and 13-8 ka. Combining with the previous investigations and dating results on shorelines within subdepressions (e.g. Jilantai), these results further support that if there was the so-called Megalake Jilantai-Hetao covering the most area of the Jilantai Basin and the Hetao Basin, the highest lake level should be sometime prior to 76 ka and likely before 90 ka if OSL ages of k-feldspar were widely accepted. However, the Dengkou Subuplift was covered by eolian sand accumulation, most like a lakeshore and desert in the intervals of 76-52 ka and 39-13 ka respectively. During the time span of 52-39 ka, area of the Dengkou Subuplift was submerged by a high lake level, which might be originated from a northward shift of the center of the Jilantai-Hetao Basin as a response to the accelerated uplift of the Qinghai-Tibet Plateau. During 13-8 ka, the Dengkou Subuplift was flooded again by the inflow of the Yellow River through the present southeast Ulan Buh Desert to form the namely Tushenze lake.
Keywords:the Dengkou Subuplift; Megalake Jilantai-Hetao; high lake level; Core; OSL dating
 
 
 

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