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首页> 外文期刊>Quaternary International >An environmental magnetic fingerprint of periglacial loess: Records ofLate Pleistocene loess-palaeosol sequences from Eastern Germany
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An environmental magnetic fingerprint of periglacial loess: Records ofLate Pleistocene loess-palaeosol sequences from Eastern Germany

机译：冰川黄土的环境磁指纹：来自德国东部的晚更新世黄土古土壤序列的记录

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摘要

A detailed rock magnetic analysis of the last glacial/interglacial loess-palaeosol sequences was carried out in the framework of a comprehensive stratigraphic study of loess in Saxony (Eastern Germany). Magnetic susceptibility and laboratory-induced remanences have been determined to compare individual sections and to identify the specific rock magnetic characteristics of the Saxonian Loess Province. According to the model of pedogenic magnetic enhancement, an increasing neoformation of ferri-magnetic minerals in the course of pedogenesis was observed only in the uppermost Late Weichselian lithological units consisting of pure aeolian loess and indicating dryer climatic conditions. In contrast, the rock magnetic characteristics of the lower Middle and Early Weichselian units exhibit a significant destruction of primary magnetic minerals caused by such secondary processes as climatically controlled waterlogging and reworking. This change in magnetic composition with stratigraphic depth was additionally proved by factor analysis in which the main observation, an increasing χ_(fd) with decreasing χ, argues for a general magnetic depletion in conjunction with decreasing magnetic grain sizes caused by weathering of larger primary particles. The magnetic fingerprint of the Saxonian loess is characterised by prevailing magnetic depletion processes, which effectively rules out the application of the wind vigour model. Moreover, the magnetic characteristics differ significantly from that of other loess regions and support a new and independent model, which explains the magnetic behaviour of strongly reworked and waterlogged (gleyed) loess-palaeosol sequences in the relatively humid Central European periglacial areas.
机译：在萨克森州（德国东部）黄土的综合地层研究框架内，对最后的冰川/间冰期黄土-古土壤序列进行了详细的岩石磁学分析。已经确定了磁化率和实验室感应的剩磁，以比较各个部分并确定萨克森黄土省的特定岩石磁特征。根据成岩磁性增强模型，仅在由纯风积黄土组成的最晚魏氏分布的岩性单元中观察到成岩过程中亚铁磁性矿物的新形成增加，并指示了干燥气候条件。相比之下，下部中魏格士早期单元的岩石磁性特征则表现出主要的磁性矿物的破坏，这种破坏是由气候控制的内涝和返工这样的次级过程引起的。磁分析结果随地层深度的变化还通过因子分析得到了证明，在该分析中，主要观察结果表明，随着χ的减小，χ_（fd）增大，这表明一般的磁损耗，同时由于较大的一次粒子风化而导致的磁晶粒尺寸减小。撒克逊黄土的磁指纹特征是主要的磁耗过程，有效地排除了风能模型的应用。此外，其磁特性与其他黄土地区的磁特性明显不同，并支持一个新的独立模型，这解释了在相对潮湿的中欧冰缘地区强改造和浸水（变灰）的黄土古土壤序列的磁行为。

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  • 来源
    《Quaternary International》 |2013年第16期|82-93|共12页
  • 作者

    Philipp Baumgart; Ulrich Hambach; Sascha Meszner; Dominik Faust;

  • 作者单位

    Physical Geography, Dresden University of Technology, D-01062 Dresden, Germany;

    Geomorphology, University of Bayreuth, D-95440 Bayreuth, Germany;

    Physical Geography, Dresden University of Technology, D-01062 Dresden, Germany;

    Physical Geography, Dresden University of Technology, D-01062 Dresden, Germany;

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