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首页> 外文期刊>Geology >Wind-blown origin of Dongwan late Miocene-Pliocene dust sequence documented by land snail record in western Chinese Loess Plateau
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Wind-blown origin of Dongwan late Miocene-Pliocene dust sequence documented by land snail record in western Chinese Loess Plateau

机译：黄土高原西部地区蜗牛记录的东湾中新世-上新世晚风序列的风吹成因

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摘要

Recently, the first late Miocene–Pliocene eolian deposits from the western Chinese Loess Plateau have been reported. These deposits would complement the eolian record between Quaternary loess-paleosol sequences and Miocene loess sequences, if their wind-blown origin could be documented. However, although several lines of evidence indicate the eolian origin of this sequence, it is still necessary to address this issue through further efforts. Among these, biological approaches are of particular value. Here we analyze the composition and preservation conditions of mollusk assemblages in the Dongwan section. Our results show that all mollusk fossil individuals are preserved in perfect condition without indicating any reworking. All identifiable mollusk species are terrestrial, and are mostly identical to those identified in the Quaternary loess-paleosol sequences of the Chinese Loess Plateau. Generally, the cold-aridiphilous species are dominant in the loess layers, while thermo-humidiphilous species are mostly encountered in the paleosols. The close similarity of the mollusk record in both the Dongwan late Miocene–Pliocene deposits and the Quaternary loess sequence in the Chinese Loess Plateau supports the supposition that the Dongwan section is a typical loess-paleosol sequence, and is, without any doubt, of wind-blown origin.
机译：最近，已经报道了中国西部黄土高原的第一个中新世-上新世风积沉积物 。这些 沉积物可以补充第四纪 黄土古土壤序列和中新世黄土序列之间的风积记录，如果它们的 风吹成因可以被记录的话。但是，尽管有几条 证据表明该序列的风成因，但 仍然有必要通过进一步的 努力来解决这个问题。在这些方法中，生物学方法具有特殊的 价值。在这里，我们分析了东湾地区软体动物组合的组成和保存条件 。我们的结果表明 ，所有软体动物个体都保存在完美的 条件下，没有进行任何返工。所有可识别的 软体动物种类都是陆生的，并且与中国黄土高原第四纪黄土古土壤序列 中识别的 相同。通常，在黄土层中，冷亲脂性的 种类占主导，而古土壤中最常见的是热湿性 种类。东湾晚中新世-上新世 沉积物中的软体动物记录与中国黄土 高原第四纪黄土序列的密切相似性 东湾断面是 典型的黄土古土壤序列，并且毫无疑问是风吹成因的 。

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  • 来源
    《Geology》 |2006年第5期|405-408|共4页
  • 作者

    Fengjiang Li; Naiqin Wu; Yunpeng Pei; Qingzhen Hao; Denis-Didier Rousseau;

  • 作者单位

    Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing100029, China;

    Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing100029, China;

    Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing100029, China;

    Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing100029, China;

    Université Montpellier II, Institut des Sciences de l'Evolution (UMR CNRS 5554), case 61, place E. Bataillon, 34095 Montpellier cedex 05, France, and Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, USA;

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