华南四川盆地侏罗纪恐龙骨骼的原位 U-Pb 定年

Geology Pub Date : 2024-01-16 DOI:10.1130/g51872.1
Liang Qi, Mingcai Hou, Jacob A. Mulder, Peter A. Cawood, Yao Guo, Shitou Wu, Liangxuan Jiao, Xiaolin Zhang, Ouyang Hui
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引用次数: 0

摘要

由于埋藏后成岩过程复杂,而且化石骨骼材料中放射性同位素(如铀)的浓度通常较低且不均匀,因此很难对脊椎动物化石进行直接测年。在这里,我们展示了一种对脊椎动物化石进行年代测定的新方法,即通过激光烧蚀-电感耦合等离子体-质谱法对华南四川盆地侏罗纪长脚类动物骨腔内沉淀的早期成岩方解石胶结物进行 U-Pb 年代测定。早期成岩方解石的 U-Pb 年龄为 165.3 ± 3.6/5.6 Ma,与周围岩石的锆石碎片年龄 165.8 ± 1.0 Ma 的最大沉积年龄一致,表明成岩作用发生在长脚类动物死亡后不久。这一新的年龄表明,华南地区最著名的侏罗纪大型长脚类动物群的年龄远大于北美和非洲的大型长脚类动物群,从而表明华南地区在地理上是与世隔绝的。对同一长足类动物的纤维状骨骼进行自生磷灰石U-Pb测年得出的年龄明显更年轻,这表明U-Pb系统的行为更为复杂,可能是由于残留有机物对铀的吸收以及早期成岩后磷灰石的再结晶造成的。我们的研究结果表明,对骨腔内的方解石胶结物进行 U-Pb 测定在确定脊椎动物化石的埋藏年龄方面具有巨大的潜力,有助于为脊椎动物的辐射和进化构建一个更稳健的时间框架。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
In situ U-Pb dating of Jurassic dinosaur bones from Sichuan Basin, South China
Direct dating of vertebrate fossils is difficult due to complex postburial diagenetic processes and the often low and heterogeneous concentration of radioisotopes (e.g., U) in fossilized bone material. Here, we demonstrate a novel approach to dating vertebrate fossils via laser ablation−inductively coupled plasma−mass spectrometry U-Pb dating of early diagenetic calcite cements precipitated within bone cavities of a Jurassic sauropod from the Sichuan Basin, South China. Early diagenetic calcite yielded a U-Pb age of 165.3 ± 3.6/5.6 Ma, in agreement with a maximum depositional age of 165.8 ± 1.0 Ma from detrital zircon ages of the surrounding rocks, suggesting that diagenesis occurred shortly after the death of the sauropod. This new age demonstrates that the best-known Jurassic large sauropod faunas in South China are much older than those in North America and Africa, suggesting the geographical isolation of South China. Authigenic apatite U-Pb dating on the fibrolamellar bones from the same sauropod gave a distinctly younger age, indicating more complex U-Pb system behavior, possibly due to U uptake by residual organic matter and recrystallization of apatite after early diagenesis. Our findings demonstrate that U-Pb dating of calcite cements within bone cavities has significant potential for constraining the burial age of vertebrate fossils, which could aid in constructing a more robust temporal framework for the radiation and evolution of vertebrates.
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