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| No apparent lock-in depth of the Laschamp geomagnetic excursion: Evidence from the Malan loess | |
| 作者姓名： | ZHU Rixiang LIU Qingsong PAN Yongxin DENG Chenglong ZHANG Rui & WANG Xianfeng . Paleomagnetism and Geochronology Laboratory |
| 基金项目： | 国家自然科学基金;中国科学院基金 |
| 摘 要： | Developing an accurate chronological framework is always a key issue in paleoclimatic studies. Magneto- stratigraphy has been a routine tool for such purposes. However, complexities arise for inter-profile correla- tions of magnetostratigraphy due to effects of the lock-in process. One good example is the “mystery” of the mismatching of stratigraphic locations of the Matuyama/Brunhes boundary (MBB) (occurred at ~780 ka) recorded in Chinese loess and marine sedi- ments. Tauxe et al.1] con… |
| 收稿时间： | 14 November 2005 |
| 修稿时间： | 13 March 2006 |
No apparent lock-in depth of the Laschamp geomagnetic excursion: Evidence from the Malan loess |
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| ZHU Rixiang,LIU Qingsong,,PAN Yongxin,DENG Chenglong,ZHANG Rui & WANG Xianfeng . Paleomagnetism and Geochronology Laboratory.No apparent lock-in depth of the Laschamp geomagnetic excursion: Evidence from the Malan loess[J].Science in China(Earth Sciences),2006,49(9):960-967. | |
| Authors: | ZHU Rixiang LIU Qingsong PAN Yongxin DENG Chenglong ZHANG Rui WANG Xianfeng |
| Institution: | 1. Paleomagnetism and Geochronology Laboratory (SKL of Lithosphere Evolution), Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2. Paleomagnetism and Geochronology Laboratory (SKL of Lithosphere Evolution), Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Institute of Geophysics and Planetary Geophysics, University of California, Santa Cruz, CA 95064,USA 3. Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455, USA |
| 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. |
| Keywords: | Chinese loess Laschamp excursion Henrich event lock-in depth |
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