Mid-Pleistocene vermiculated red soils in southern China as an indication of unusually strengthened East Asian monsoon

作     者：YIN Qiuzhen~1 & GUO Zhengtang~(2,1) 1.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 2.Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710075,China 

会议名称：《中国科学院地质与地球物理研究所2006学术年会》

会议日期：2007年

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

关 键 词：vermiculated red soil paleosols micromorphology paleoclimate mid-Pleistocene East Asian monsoon 

摘      要：The mid-Pleistocene vermiculated red soils(VRS) from Xuancheng(Anhui Province) and Bose(Guangxi) are studied through soil micromorphological,mineralogical and chemical *** results indicate a polygenetic nature of the VRS,having experienced multiple soil-forming *** main stages have been recognized,attributable to distinct climate *** include the formation of the homogeneous matrix of a red soil(stage 1), development of the white veins within the soil profile(stage 2),and formation of juxtaposed textural features(stage 3).The white veins,resulting from iron-depletion in the groundmass of the homogeneous matrix of a red soil,required abundant rainfall without significant seasonal *** geographically widely spread VRS south of the Yangtze River in China implies a Mid-Pleistocene extreme East Asian summer *** climate extreme might be closely linked with the changes in the strength of NADW.