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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >New Lu-Hf and Pb-Pb age constraints on the earliest animal fossils
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New Lu-Hf and Pb-Pb age constraints on the earliest animal fossils

机译：最早的动物化石新的Lu-Hf和Pb-Pb年龄限制

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The Neoproterozoic Doushantuo Formation, South China, preserves a unique assemblage of early multicellular fossils and overlies rocks, which are thought to have formed during an ice age of global extent. The age of this formation is thus critical for understanding the important biological and climatic events that occurred towards the end of the Proterozoic Eon. Until now, direct dating of sedimentary formations such as the Doushantuo has been difficult and associated with large uncertainties. Here, we show that dating of Doushantuo phosphorites by a novel Lu-Hf dating method and conentional Pb-Pb geochronometry independently yield ages of 584 ± 26 Ma and 599.3 ± 4.2 Ma, respectively. These ages are in agreement with bio- and chemostratigraphical observations and show that the Doushantuo animal remains predate diverse Ediacaran fossil assemblages, making them the oldest unambiguous remains of metazoans currently known. Furthermore, the Pb-Pb age for the post-glacial Doushantuo rocks suggests that the Neoproterozoic glaciation in China might predate glacial rocks in Eastern North America commonly associated with the younger (Marinoan) of two major Neoproterozoic glaciations. The combination of Lu-Hf and Pb-Pb dating shows considerable potential for dating other phosphorite successions and future application of these methods could therefore provide further constraints on Proterozoic biological and environmental history.
机译：中国南方的新元古代杜桑托组保留着独特的早期多细胞化石组合，并覆盖了岩石，这些岩石被认为是在全球范围的冰河时代形成的。因此，这种形成的年龄对于了解在元古代末期发生的重要生物学和气候事件至关重要。到目前为止，诸如杜尚图托这样的沉积岩层的直接测年一直很困难，并且存在很大的不确定性。在这里，我们显示了通过新颖的Lu-Hf测年方法和常规的Pb-Pb年代学法对杜尚托磷矿的测年分别产生的年龄为584±26 Ma和599.3±4.2 Ma。这些年龄与生物和化学地层学的观察结果一致，表明杜尚图动物仍早于多种Ediacaran化石组合，使其成为目前已知的最古老的后生动物遗骸。此外，冰川后的杜尚图多岩石的铅-铅年龄表明，中国的新元古代冰川作用可能早于北美东部的冰川岩石，而后者通常与两个主要的新元古代冰川的年轻（马里诺期）有关。 Lu-Hf和Pb-Pb测年的组合显示出对其他磷矿演替进行测年的巨大潜力，因此这些方法的未来应用可能会进一步限制元古代生物和环境史。

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