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

ISSN号：1001-7410
期刊名称：《第四纪研究》
时间：0
分类：P532[天文地球—古生物学与地层学;天文地球—地质学]
作者机构：[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
相关基金：Dr. Hao Qingzhen, Qiao Yansong and Wei Jianjing participated in the filed investigations and sample collection. The authors thank Profs. Yuan Baoyin, Huang Weiwen, Hou Yamei and Wang Wei for help during the field investigations at Bose. Yin Qiuzhen thanks Dr. Peng Shuzhen for help in XRD analyses. This work was supported by Chinese Academy of Sciences （Grant Nos. KZCX2-SW-133 and KZCX3-SW-139） and the National Natural Science Foundation of China （Grant Nos. 40231001, 40121303）.

关键词：更新世中期, 古气候, 古土壤, 东亚季风, 虫蛀状红土, 微观形态学, vermiculated red soil, paleosols, micromorphology, paleoclimate, mid-Pleistocene, East Asian monsoon.

中文摘要：

中间 -- 从 Xuancheng (AnhuiProvince ) 和 Bose (Guangxi ) 的更新世 vermiculated 红土壤(VRS ) 通过土壤 micromor-phological 被学习，矿物学、化学的途径。结果显示 VRS 的一个多色的性质，经历了多重形成土壤的舞台。三个主要舞台被认出了，对不同气候政体可归因。他们包括红的同类的矩阵的形成土壤(舞台 1 ) ，在土壤侧面(舞台 2 ) 以内的白静脉的发展，和形成组织上并列了特征(舞台 3 ) 。白静脉，从铁弄空导致红土壤的同类的矩阵的扎根的团，没有重要季节的干燥的要求的丰富的降雨。地理上，广泛地，在中国的长江的传播 VRS 南方暗示在更新世中极端东方亚洲夏天季风。这气候极端可能仔细在 NADW 的力量与变化被连接。

英文摘要：

The mid-Pleistocene vermiculated red soils （MRS） from Xuancheng （Anhui Province） and Bose （Guangxi） are studied through soil micromorphological, mineralogical and chemical approaches. The results indicate a polygenetic nature of the VRS, having experienced multiple soil-forming stages. Three main stages have been recognized, attributable to distinct climate regimes. They 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 desiccations. The geographically widely spread VRS south of the Yangtze River in China implies a Mid-Pleistocene extreme East Asian summer monsoon. This climate extreme might be closely linked with the changes in the strength of NADW.

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