Coupled ESR and U-series dating of Middle Pleistocene hominin site Bailongdong cave, China
Coupled ESR and U-series dating of Middle Pleistocene hominin site Bailongdong cave, China
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中国中更新世古人类遗址白龙洞洞穴耦合ESR和U系列测年
DOI：
10.1016/j.quageo.2018.02.004
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发表时间：
2019-02-01
影响因子：
2.7
通讯作者：
Yin, Gongming
中科院分区：
文献类型：
--
作者：
Han, Fei;Shao, Qingfeng;Yin, Gongming
中国古人类的化石证据对于了解人类在欧亚大陆的演化和分布至关重要。然而，中国早、中更新世人类记录的年代测定仍然是一个严重的问题。本研究采用ESR/U-系联用方法，对中国早期南北人类迁徙的重点研究区域--湖北白龙洞古人类洞穴遗址进行了测年。铀系分析表明，三个层位的牙齿化石样品接近或超过平衡，这表明铀的早期吸收或潜在损失。D-E测定采用10个剂量点的单饱和指数拟合，剂量点最高可达4kGy，只有1个剂量点采用16个剂量点的双饱和指数拟合，剂量点最高可达63 kGy。通过两种铀迁移模型的计算，得到第2层5颗牙齿化石的加权平均年龄为509 ± 16 ka。结合前人对化石层下洞穴沉积物进行的宇宙成因核素Al-26/Be-10埋藏定年，综合定年结果，确定白龙洞遗址的时代为中更新世早期，并将化石遗迹的沉积时代确定为海相同位素第13阶段。这与该区动物群组成和沉积特征显示的亚热带-热带暖性林草环境相一致。白龙洞遗址的宇生法和ESR/U系列耦合法多方法测年为未来中国早期人类遗址的年代学研究提供了一个很好的范例。
The fossil evidence of hominins in China is crucial to understand the human evolution and dispersal in Eurasia. However, the dating of Chinese Early and Middle Pleistocene hominin record remains a serious problem. In this study, we applied coupled ESR/U-series dating method on Bailongdong hominin cave site in Hubei Province, central China, which is a key area to study early human migration between South and North China. The U-series analyses show that the fossil teeth samples from three horizons are close or beyond equilibrium, which indicate very early uptake or potential loss of uranium. Single saturation exponential fitting of 10 dose points irradiated up to 4 kGy was used for D-E determination except one by double saturation exponential fitting with 16 dose points up to 63 kGy. Calculated by two uranium migration models, we obtain a weighted mean age of 509 +/- 16 ka for five fossil teeth from layer 2. Combined with cosmogenic nuclides Al-26/Be-10 burial dating carried out on the cave deposits beneath the fossil layers in previous study, the multi-methods dating study places Bailongdong site at the early stage of Middle Pleistocene, and pinpoints the deposition of the fossil remains to the time of marine isotope stages 13. This is in agreement with the fauna composition and sedimentary characteristics which show a subtropical-tropical warm forest-grass environment. The multi-methods dating of Bailongdong site by both cosmogenic and coupled ESR/U-series methods is a good example for the future chronological studies of early human sites in China.