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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Pedogenic factors affecting magnetic susceptibility of the last interglacial palaeosol S1 in the Chinese Loess Plateau
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Pedogenic factors affecting magnetic susceptibility of the last interglacial palaeosol S1 in the Chinese Loess Plateau

机译：影响黄土高原最后一个冰间古土壤S1磁化率的成岩因素

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The magnetic susceptibility has been used as a quantitative or semi-quantitative proxy for reconstructing the summer monsoon intensity in the Chinese Loess Plateau based on extensive studies on climatic or/and environmental mechanisms producing the magnetic susceptibility signatures. However, the precise nature of the link between past climates and the susceptibility signatures has remained uncertain primarily due to lack of our understanding in the finalizing and preserving processes of the signatures. This paper attempts to examine the reliability or acceptability of this summer monsoon proxy from non-magnetic perspectives of soil-forming processes. We chose nine sections along two transects: one across the western part of the Chinese Loess Plateau and another across the eastern part. Several conclusions can be drawn from our analytical data. First, clay translocation within the S1 palaeosol profiles, as indicated by field-observed clay coatings on ped faces in Bt and Bk horizons and demonstrated by laboratory-analysed clay contents, must have moved some of the magnetic minerals downward so that the susceptibility reflects only the post-trans location distribution of the magnetic-susceptibility-producing minerals. Second, the best-developed palaeosol S1S3 at most of the sections studied is not expressed by the magnetic susceptibility because this palaeosol developed in underlying coarse loess (L2) and coarse textures tend to lower the susceptibility. Third, carbonate concentration is normally negatively correlated with the magnetic susceptibility or simply suppresses the magnetic susceptibility peak when the susceptibility enhancement exceeds the carbonate dilution effect. To conclude, extreme caution must be observed when using magnetic susceptibility signatures to retrieve high-resolution records of the last interglacial palaeoclimate in the Chinese Loess Plateau. Copyright (C) 2004 John Wiley Sons, Ltd.
机译：基于对产生磁化率特征的气候或环境机制的广泛研究，磁化率已被用作定量或半定量的手段来重建中国黄土高原的夏季风强度。但是，过去的气候与易感性签名之间的联系的确切性质仍然不确定，这主要是由于在签名的定稿和保存过程中缺乏我们的理解。本文试图从土壤形成过程的非磁性角度研究这种夏季风季风代理的可靠性或可接受性。我们沿着两个样带选择了九个剖面：一个横跨中国黄土高原的西部，另一个横跨东部。从我们的分析数据可以得出几个结论。首先，S1古土壤剖面内的粘土易位，如在Bt和Bk地层的人行道上实地观察到的粘土涂层所表明的，并由实验室分析的粘土含量所表明，必须使某些磁性矿物向下移动，这样磁化率仅能反映出产生磁化率的矿物的转换后位置分布。其次，在大多数研究的剖面中，最发达的古土壤S1S3不能用磁化率表示，因为这种古土壤在下伏的粗粒黄土（L2）中发育，并且粗大的质地往往会降低磁化率。第三，当磁化率提高超过碳酸盐稀释效果时，碳酸盐浓度通常与磁化率呈负相关，或者简单地抑制磁化率峰。总之，在使用磁化率特征来检索中国黄土高原最后一个冰间古气候的高分辨率记录时，必须格外小心。版权所有（C）2004 John Wiley Sons，Ltd.

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