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首页> 美国卫生研究院文献>Scientific Reports >Precisely dating the Frasnian–Famennian boundary: implications for the cause of the Late Devonian mass extinction
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Precisely dating the Frasnian–Famennian boundary: implications for the cause of the Late Devonian mass extinction

机译：精确确定弗拉斯尼亚-法门尼边界的年代：对泥盆纪晚期物种大灭绝的影响

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The Frasnian–Famennian boundary records one of the most catastrophic mass extinctions of the Phanerozoic Eon. Several possible causes for this extinction have been suggested, including extra-terrestrial impacts and large-scale volcanism. However, linking the extinction with these potential causes is hindered by the lack of precise dating of either the extinction or volcanic/impact events. In this study, a bentonite layer in uppermost-Frasnian sediments from Steinbruch Schmidt (Germany) is re-analysed using CA-ID-TIMS U-Pb zircon geochronology in order to constrain the date of the Frasnian–Famennian extinction. A new age of 372.36 ± 0.053 Ma is determined for this bentonite, confirming a date no older than 372.4 Ma for the Frasnian–Famennian boundary, which can be further constrained to 371.93–371.78 Ma using a pre-existing Late Devonian age model. This age is consistent with previous dates, but is significantly more precise. When compared with published ages of the Siljan impact crater and basalts produced by large-scale volcanism, there is no apparent correlation between the extinction and either phenomenon, not clearly supporting them as a direct cause for the Frasnian–Famennian event. This result highlights an urgent need for further Late Devonian geochronological and chemostratigraphic work to better understand the cause(s) of this extinction.
机译：Frasnian-Famennian边界记录了远古生代离子的最灾难性的物种灭绝之一。已经提出了造成这种灭绝的几种可能原因，包括地外影响和大规模的火山活动。然而，由于缺乏对灭绝事件或火山/撞击事件的精确年代的确定，阻碍了将灭绝与这些潜在原因联系起来。在这项研究中，使用CA-ID-TIMS U-Pb锆石年代学对来自Steinbruch Schmidt（德国）的最上层弗拉西尼亚沉积物中的膨润土层进行了重新分析，以限制Frasnian-Famennian灭绝的日期。确定该膨润土的新年龄为372.36±0.053Ma，这证实了Frasnian-Famennian边界的日期不早于372.4 Ma，可以使用先前存在的晚泥盆世年龄模型将其进一步限制为371.93–371.78 Ma。该年龄与以前的日期一致，但精确得多。与大规模火山活动产生的Siljan撞击坑和玄武岩的公布年龄进行比较时，灭绝与这两种现象之间没有明显的相关性，也没有明确支持它们是造成Frasnian-Famennian事件的直接原因。这一结果表明，迫切需要进一步开展泥盆纪晚期的年代学和化学地层学工作，以更好地了解这种灭绝的原因。

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