Magnetostratigraphic dating of hominoid-bearing sediments at Zhupeng, Yuanmou Basin, southwestern China
Magnetostratigraphic dating of hominoid-bearing sediments at Zhupeng, Yuanmou Basin, southwestern China
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DOI：
10.1016/j.epsl.2005.05.039
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发表时间：
2005-08
影响因子：
5.3
通讯作者：
R. Zhu;Qingsong Liu;H. Yao;Zhengtang Guo;C. Deng;Yongxin Pan;L. Lü;Zhigang Chang;F. Gao
中科院分区：
文献类型：
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作者：
R. Zhu;Qingsong Liu;H. Yao;Zhengtang Guo;C. Deng;Yongxin Pan;L. Lü;Zhigang Chang;F. Gao
在中国西南部元谋盆地发现的人科化石是了解东亚早期人科动物演化及其与欧洲和非洲同时代人科动物关系的关键化石之一。然而，他们的确切年龄尚未确定。朱棚剖面是本区含化石地层的典型剖面之一，本文对该剖面进行了高分辨率磁性地层学研究。根据227个方向的磁性地层学资料，结合小型哺乳动物群的年龄，表明含古猿层的年代为3Br 2 r或3Br 1 r，即7.43- 7.38Ma或7.34- 7.17Ma。这无疑表明元谋人科化石的时代是中新世晚期，因此使其成为欧亚大陆发现的最年轻的人科化石。元谋盆地可能在环境发生重大变化的时期为人科动物提供了避难所。
The hominoid fossils found in the Yuanmou Basin, southwestern China, are among the key fossils for understanding the evolution of early hominoids in eastern Asia and their relationship with coeval hominoids in Europe and Africa. However, their exact ages have not yet been well determined. We provide a new high-resolution magnetostratigraphy for the Zhupeng profile, which is one of the fossil-bearing type sections in the region. Based on magnetostratigraphy of 227 remanent directions, together with the age of micromammalian fauna, indicate that the hominoid-bearing layer is dated within polarity chron 3Br 2r or 3Br 1r, i.e. within the interval 7.43–7.38 Ma or 7.34–7.17 Ma. This unambiguously indicates that the Yuanmou hominoid has a late Miocene age, which therefore makes it the youngest hominoid found in Eurasia. It is possible that the Yuanmou Basin provided a refuge for hominoids during a time of major environmental changes.