摘要
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.
The first-order chronological framework of the long-term Chineseloess/paleosol sequences was based mainly on magnetostratigraphy. However, there remain arguments onthe lock-in ages of the major geomagnetic reversals. This study systematically compared thestratigraphic locations of the Laschamp excursion and Henrich events (H4 at ～ 39 ka and H5 at ～ 48ka) recorded by the Luochuan loess profile in the central Chinese Loess Plateau. Results show thatthe Lascchamp excursion is bracketed well by these two cold events, and the corresponding estimatedage is between about 41.7 - 43.7 ka, which is close to the widely accepted age of ～ 40-41 ka forthe excursion. Therefore, our new results do not suggest apparent lock-in effects in the lastglacial Malan loess.
作者
ZHU Rixiang1, LIU Qingsong1,2, PAN Yongxin1, DENG Chenglong1, ZHANG Rui1 & WANG Xianfeng3 1. Paleomagnetism and Geochronology Laboratory (SKL of Lithosphere Evolution), Institute of Geology and Geophysics, Chi- nese Academy of Sciences, Beijing 100029, China
2. 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
