Calibrating the End-Permian Mass Extinction
Calibrating the End-Permian Mass Extinction
复制标题
校准二叠纪末大规模灭绝
DOI：
10.1126/science.1213454
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发表时间：
2011-12-09
期刊：
影响因子：
56.9
通讯作者：
Jin, Yu-gan
中科院分区：
文献类型：
--
作者：
Shen, Shu-zhong;Crowley, James L.;Jin, Yu-gan
高精度的地质年代测定限制了地球上最大规模灭绝的可能原因。二叠纪末的大灭绝是地球历史上最严重的生物多样性危机。为了更好地限制时间，并最终导致这一事件，我们收集了一套地质年代学，同位素和生物地层学数据在华南几个保存完好的沉积剖面。高精度的U-Pb测年显示，灭绝峰发生在2.5228亿± 0.08亿年前，δ 13 C在9万年内下降了2 ‰，与δ 13 C的-5 ‰的偏移相吻合，估计持续了≤ 2万年。灭绝间隔不到20万年，在海洋和陆地领域同步;相关的富含木炭和烟灰层表明陆地上广泛的野火。大量释放的生热二氧化碳和/或甲烷可能导致了灾难性的灭绝。
High-precision geochronologic dating constrains probable causes of Earth's largest mass extinction. The end-Permian mass extinction was the most severe biodiversity crisis in Earth history. To better constrain the timing, and ultimately the causes of this event, we collected a suite of geochronologic, isotopic, and biostratigraphic data on several well-preserved sedimentary sections in South China. High-precision U-Pb dating reveals that the extinction peak occurred just before 252.28 ± 0.08 million years ago, after a decline of 2 per mil (‰) in δ13C over 90,000 years, and coincided with a δ13C excursion of −5‰ that is estimated to have lasted ≤20,000 years. The extinction interval was less than 200,000 years and synchronous in marine and terrestrial realms; associated charcoal-rich and soot-bearing layers indicate widespread wildfires on land. A massive release of thermogenic carbon dioxide and/or methane may have caused the catastrophic extinction.