Age and pattern of the southern high-latitude continental end-Permian extinction constrained by multiproxy analysis
Age and pattern of the southern high-latitude continental end-Permian extinction constrained by multiproxy analysis
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DOI：
10.1038/s41467-018-07934-z
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发表时间：
2019-01-23
影响因子：
16.6
通讯作者：
Crowley, James L.
中科院分区：
文献类型：
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作者：
Fielding, Christopher R.;Frank, Tracy D.;Crowley, James L.
过去对二叠纪末灭绝（EPE）这一显生宙最大的生物危机的研究尚未解决南部高纬度地区事件发生的时间问题。在这里，我们使用孢粉学结合对澳大利亚悉尼盆地大陆序列的自形锆石进行高精度 CA-ID-TIMS 测年，表明南二叠纪舌羊齿植物群的崩溃发生在 252.3 Ma 之前（类似于主要海洋灭绝之前的 370 kyrs）。风化代理表明，区域冲积景观在短暂的气候扰动期间发生了植物区系的变化，否则该地区的冲积景观经历了河流风格的非实质性变化、沉积表面的微不足道的重组以及没有突然的干旱化。古气候模型表明，整个 EPE 地区的夏季气温适度转向温暖，温度季节性增强，三叠纪早期所有季节的气候条件都变得更加温暖和湿润。陆地 EPE 和悉尼盆地随后出现的 Ni 浓度峰值分别与西伯利亚圈闭大型火成岩省的初级喷出和侵入阶段的开始相关。
Past studies of the end-Permian extinction (EPE), the largest biotic crisis of the Phanerozoic, have not resolved the timing of events in southern high-latitudes. Here we use palynology coupled with high-precision CA-ID-TIMS dating of euhedral zircons from continental sequences of the Sydney Basin, Australia, to show that the collapse of the austral Permian Glossopteris flora occurred prior to 252.3 Ma (similar to 370 kyrs before the main marine extinction). Weathering proxies indicate that floristic changes occurred during a brief climate perturbation in a regional alluvial landscape that otherwise experienced insubstantial change in fluvial style, insignificant reorganization of the depositional surface, and no abrupt aridification. Palaeoclimate modelling suggests a moderate shift to warmer summer temperatures and amplified seasonality in temperature across the EPE, and warmer and wetter conditions for all seasons into the Early Triassic. The terrestrial EPE and a succeeding peak in Ni concentration in the Sydney Basin correlate, respectively, to the onset of the primary extrusive and intrusive phases of the Siberian Traps Large Igneous Province.