Clay record of climate change since the mid-Pleistocene in Jiujiang, south China
Clay record of climate change since the mid-Pleistocene in Jiujiang, south China
复制标题
九江中更新世以来气候变化的粘土记录
DOI：
10.1111/j.1502-3885.2012.00276.x
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发表时间：
2013-01-01
期刊：
影响因子：
2.2
通讯作者：
Li, Zhaohui
中科院分区：
文献类型：
--
作者：
Hong, Hanlie;Gu, Yangsheng;Li, Zhaohui
洪，H.顾，Y.，Yin，K.，Wang，C.和Li，Z. 2013年1月：九江中更新世以来气候变化的粘土记录。Boreas，Vol. 42，pp. 173-183. 10.1111/j.1502-3885.2012.00276.x。ISSN 0300-9483。为了更好地了解华南第四纪的气候变化，采用X射线衍射（XRD）和粒度分析方法，对九江红土剖面进行了粘土矿物学研究。XRD分析结果表明，九江红壤的粘土矿物主要为伊/蒙混层（I/S）、伊利石、高岭石和蛭石，并含有少量的高岭石/蒙混层（K/S）。粘土矿物组成的变化呈现出三阶段演化的趋势。下部较高的I/S混合层粘土和高岭石含量表明，在c. 700到C。350 ka前。I/S粘土和高岭石的逐渐减少揭示了c期气候从温暖/潮湿到凉爽/干燥的逐渐变化。350到C。13万年前伊利石和蛭石含量较高，表明该时期气候相对凉爽干燥。13万年前上部颗粒分布模式与下蜀黄土相似，中下部颗粒分布模式与河流改造红土相似。在2.6米深度的大粒度组分的丰度迅速增加，表明冬季风的加强和凉爽干燥的气候在此期间，在很好的协议从粘土矿物成分和均匀结构的结果。华南红土序列可能可以用来检验热带至亚热带地区对全球气候变化的响应。
Hong, H., Gu, Y., Yin, K., Wang, C. & Li, Z. 2013 (January): Clay record of climate change since the mid-Pleistocene in Jiujiang, south China. Boreas, Vol. 42, pp. 173-183. 10.1111/j.1502-3885.2012.00276.x. ISSN 0300-9483. To obtain a better understanding of climate change in south China in the Quaternary, a clay mineralogical study was undertaken on the red earth profile at Jiujiang, using X-ray diffraction (XRD) and particle-size distribution analysis methods. The XRD results showed that the clay minerals of the Jiujiang red earth were mainly mixed-layer illite-smectite (I/S), illite, kaolinite and vermiculite, with trace amounts of mixed-layer kaolinite-smectite (K/S). Changes in clay mineral composition displayed a trend of three-stage evolution. The higher mixed-layer I/S clays and kaolinite contents in the lower portion suggest extremely warm and humid climates over the period c. 700 to c. 350 ka ago. A gradual decrease in I/S clays and kaolinite reveals a gradual climate change from warm/humid to cool/dry during the period c. 350 to c. 130 ka ago. The higher illite and vermiculite contents indicate a relatively cool and dry climate during the period since c. 130 ka ago. The particle-size distribution pattern of the upper section was similar to that of the Xiashu loess, while that of the middle to lower section was similar to those of fluvially reworked red earth. A rapid increase in the abundance of large grain-size components at 2.6 m depth indicates an intensification of the winter monsoon and a cool and dry climate during the period, in good agreement with results from the clay mineral composition and homogeneous structure. The red earth sequences in south China could probably be used to test the response of tropical to subtropical regions to global climate changes.