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No apparent lock-in depth of the Laschamp geomagnetic excursion: Evidence from the Malan loess

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Abstract

The first-order chronological framework of the long-term Chinese loess/paleosol sequences was based mainly on magnetostratigraphy. However, there remain arguments on the lock-in ages of the major geomagnetic reversals. This study systematically compared the stratigraphic locations of the Laschamp excursion and Henrich events (H4 at ∼39 ka and H5 at ∼48 ka) recorded by the Luochuan loess profile in the central Chinese Loess Plateau. Results show that the Lascchamp excursion is bracketed well by these two cold events, and the corresponding estimated age is between about 41.7–43.7 ka, which is close to the widely accepted age of ∼40–41 ka for the excursion. Therefore, our new results do not suggest apparent lock-in effects in the last glacial Malan loess.

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Authors and Affiliations

  1. Paleomagnetism and Geochronology Laboratory (SKL of Lithosphere Evolution), Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China

    Zhu Rixiang, Liu Qingsong, Pan Yongxin, Deng Chenglong & Zhang Rui

  2. Institute of Geophysics and Planetary Geophysics, University of California, Santa Cruz, CA, 95064, USA

    Liu Qingsong

  3. Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN, 55455, USA

    Wang Xianfeng

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  1. Zhu Rixiang
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  2. Liu Qingsong
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  3. Pan Yongxin
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  4. Deng Chenglong
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  5. Zhang Rui
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  6. Wang Xianfeng
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Correspondence to Zhu Rixiang.

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Zhu, R., Liu, Q., Pan, Y. et al. No apparent lock-in depth of the Laschamp geomagnetic excursion: Evidence from the Malan loess. SCI CHINA SER D 49, 960–967 (2006). https://doi.org/10.1007/s11430-006-0960-x

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  • DOI: https://doi.org/10.1007/s11430-006-0960-x

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