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The Color of Lacustrine Sediments Recorded Climatic Changes from 13 to 4.5 Myr in Linxia Basin

SONG Chun-hui1 BAI Jin-feng2 ZHAO Yan-de1 JING Hong-bo1 MENG Qing-quan1 1 (Key Laboratory of Western China's Environmental Systems (Ministry of Education of China) & College of Resources and Environment, Lanzhou University, Lanzhou 730000)2 (Taiyuan University of Technology, Taiyuan 030024)  
It is an important content that recovering paleoclimatic environment change by using high-resolution substitute proxy. The paper established a high-resolution sequence of the color records of the lacustrine sediments from 13 to 4.5Ma through the measurement of continuous 2060 samples collected in Linxia basin at an interval of 10cm. Based on the analyses of sediment color with the sediment composition, and compare the color records with the content variation curves of chlorine ion, aeolian quartz, calcium carbonate and pollen in the Linxia basin as well as aeolian silt from ODP885/886 drill in North Pacific Ocean, the relationship between the color records of lacustrine sediments and climate changes are discussed, and the two climatic shifts about 8 and 6.2 Myr are revealed.
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