Magnetic susceptibility enhancement model and its driving mechanism of Lanzhou loess on the Western Loess Plateau
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摘要:
我国黄土高原第四纪风成黄土序列为研究不同时间尺度(构造和轨道尺度)的环境演变提供了理想材料，其中轨道尺度上冰期-间冰期气候变化是第四纪以来气候周期性演变的重要特征。粒度和磁化率分别作为冬季风和夏季风指标被广泛应用于亚洲内陆干旱化和古季风演化研究。然而，磁化率作为古气候代用指标在解释区域环境演化时存在差异性，并不能将其总视为暖湿信号。以黄土高原西部地区的兰州皋兰山和西津岩心为研究对象，详细分析了倒数第二次冰期以来的粒度和磁化率特征，并与洛川剖面进行空间对比。研究表明，间冰期的磁化率总体高于冰期，但在冰期向间冰期转换的过渡期，皋兰山和西津岩心磁化率值并没有降低到冰期水平，而与弱发育古土壤磁化率水平类似。我们推测该时段兰州黄土磁化率增加并非由成壤作用增强贡献，而是源区粗颗粒磁性矿物增加所致，其磁化率增强模式可能同阿拉斯加、新疆黄土类似。由此可见，磁化率增强模式不仅在冰期时黄土高原东西部存在显著差异，而且在同一区域的不同沉积时期也存在较大差别。
Abstract:The Quaternary loess-paleosol sequence provides an ideal document for studying both the tectonic and orbital scale environmental evolutions. And the Quaternary climate is characterized by the glacial-interglacial cycle on the orbital scale. Grain size and magnetic susceptibility are the classic proxies for the winter and summer monsoon respectively, which reveals the interior Asian aridification and monsoon evolution history. Actually, as the summer monsoon proxy, the magnetic susceptibility is restricted by regional climate background and can not always be used to represent the warm/humid signal. In this study, we firstly reconstructed the penultimate glacial grain size and magnetic susceptibility variations for the Gaolanshan and Xijin cores located in the western part of Chinese Loess Plateau. And then the potential reasons for the magnetic susceptibility model were discussed based on the spatial comparison between the western and eastern Chinese Loess Plateau. Our results indicate that the interglacial magnetic susceptibility of the Gaolanshan and Xijin loess is higher than the glacial one. However, during the interval of glacial-interglacial transitions (140~130ka and 22ka), the magnetic susceptibility values did not reduce to the glacial level, but similar to the weak paleosol level. We ascribe the enhanced magnetic susceptibility to the increased magnetic particles, which were derived from the source region and carried by the winter monsoon, but did not form by pedogensis. So this enhanced model of magnetic susceptibility during the glacial-interglacial transitions is different from that of the eastern Chinese Loess Plateau, and similar to that of the Alaska loess. Therefore, the magnetic susceptibility enhancement mechanism is different in both the different part of Chinese Loess Plateau, and the different depositional stage of the Lanzhou loess.
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Key words:
- magnetic susceptibility /
- glacial-interglacial /
- Lanzhou loess /
- Gaolanshan core
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