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R/S Analysis of Indexes of Ferric Oxide From Tianshuihai Lake Core and Their Implication

ZHOU Houyun; YU Suhua; ZHU Zhaoyu;WEN Qizhong( Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640) LI Shjie; HE Yixian (Lanzhou Institute of Glaciology and Geocryology,CAS, Lanzhou 730000;) LI Bingyuan(Institute of Glaciology CAS, Beijing 100101)  
Based on a R / S analysis of FeO,Fe2O3 and ratio of FeO/ Fe2O3 from Tianshuihai Lake core, which is scaled with time, it is found that there are obvious Hurst effect with Hurst indexes of 0.85, 0.76 and 0.65 respectively. All the three Hurst indexes are greater than 0.5, showing a persistence in the climate and environment evolution around the Tianshuihai lake area during the past 200 ka or more.At present it is not clear why these Hurst indexes are different from each other. Maybe this shows a difference in the intensity of persistence in climatic and environment variation. The persistence in the climatic and environmental evolution around the Tianshuihai lake area since 200 ha BP or more also existed in some other areas and probably resulted from the uplift of the Tibetan Plateau through the Cenozoic era.
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