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《Geological Review》 2010-03
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Characters of the Last Interglacial Red Earth in the Hilly Area, Northeastern Guangdong, South China, and Their Climatic Environment Significances

LI Zhiwen1,2), LI Baosheng2,3), DONG Yuxiang1), WEN Xiaohao2), QIU Shifan4),NIU Dongfeng2), OU Xianjiao2), PENG Peixin2) 1) Geography and Planning School, Sun Yat-sen University, Guangzhou,510275;2) School of Geography, South China Normal University, Guangzhou,510631;3) State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710061;4) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640  
It is revealed by our studies that the Jiaoling red earth in the hilly area, northeastern Guangdong, South China, developed in the last interglacial period and belongs to silty clay in terms of lithology. Meanwhile, the red earth’s fine-grained clay content 12.15%~24.64% (average 18.46%),Mz 5.91Φ~7.53Φ(6.72Φ) and the four-segment distribution of cumulative probability curve is roughly consistent with the three-peak distribution of frequency curve for each sample. The primary oxides of major elements are mainly SiO2, Al2O3 and TFe2O3(Fe2O3+FeO), of which the contents are 50.10%~53.14%(51.36%),23.07%~24.44%(24.00%), 10.18%~11.40%(10.77%) , respectively, whereas the CaO, Na2O, MgO and K2O contents are all below 1%. Moreover, The approximative fine silt distribution of grain size and the desilicification—allitization phenomenon indicating a strong chemical weathering and eluviation. In addtition, the Si/Al ratios of most red earth horizons indicate a less intensive allitization. A thorough comparison of the content of grains smaller than 2μm or 1μm, Si/Al ratio, and CIA between Jiaoling red earth and mordern latosolic red soil, and laterite in some of China’s north tropical and south subtropical zones reveals that the red earth developed in a climatic environment that is more warm—humid than that of the present south subtropical zone, and similar to that of the north margin of the present tropical zone. Such a viewpoint is roughly consistent with predecessors' conclusion on the paleoecology indicated by the Ailuropoda—Stegodon fauna during that period. Therefore, we conclude that the last interglacial northeastern Guangdong and even the full extent of South China were in a climatic environment similar to that of the north margin of present tropical zone, and the boundary between the tropical and subtropical zones experienced a northward migration of at least 3 degrees of latitude.
【Fund】: 中国科学院地球环境研究所黄土与第四纪地质国家重点开放实验室基金(批准号SKLLQG0809);; 高等学校博士学科点专项科研基金(批准号20070574005);; 国家自然科学基金(批准号40471139);; 教育部国家大学生创新性实验计划(批准号081057415)项目的成果
【CateGory Index】: P642.132;P532
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