Timing of the terrestrial Permian-Triassic boundary biotic crisis: Implications from U-Pb dating of authigenic zircons
Timing of the terrestrial Permian-Triassic boundary biotic crisis: Implications from U-Pb dating of authigenic zircons
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陆地二叠纪-三叠纪边界生物危机的发生时间：自生锆石 U-Pb 测年的意义
DOI：
10.1007/s11430-008-0123-3
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发表时间：
2008-10
期刊：
影响因子：
--
通讯作者：
Feng QingLai
中科院分区：
文献类型：
--
作者：
Yu JianXin;Li HuiMin;Zhang Suxin;Yang FengQing;Feng QingLai
晚二叠世至早三叠世的过渡代表了显生界最重要的大灭绝事件之一。这一事件的原因仍在灾难性和渐进性机制之间的争论中。本研究采用U-Pb法对贵州茶河(中国西南)二叠/三叠系粘土矿床中的锆石进行了研究，以探讨该事件的时间限制。研究结果表明，68a层和68c层(陆相二叠系-三叠系界线上粘土层)的年龄分别为252.6±2.8 Ma和247.5±2.8 Ma。该年龄(在误差范围内)与梅山上粘土层(28层)和通古斯玄武岩喷发年龄基本一致，是迄今为止从陆源PTB获得的最准确的年龄。68层粘土岩形成于早三叠世。在二叠纪-三叠纪，生物危机几乎同时发生在陆地和海洋环境中，但灭绝的模式和过程不同。陆生植物的灭绝模式在长期演化后表现为PTB的大幅下降，然后是早期三叠纪遗迹的缓慢灭绝。
The Late Permian to Early Triassic transition represents one of the most important Phanerozoic mass extinction episodes. The cause of this event is still in debate between catastrophic and gradual mechanisms. This study uses the U-Pb method on zircons from the uppermost Permian/lowermost Triassic clay deposits at Chahe (Guizhou Province, SW China) to examine time constraints for this event. The results of both this and previous studies show that the ages of Bed 68a and 68c (the upper clay bed of the terrestrial Permian-Triassic boundary (PTB)) respectively are 252.6±2.8 and 247.5±2.8 Ma. This age (within the margin of error) almost accords with the upper clay bed (Bed 28) age of Meishan and the eruption age of Tunguss Basalt, and is so far the most accurate age obtained from terrestrial PTB. The claystone of Bed 68 was formed in the earliest Triassic. The biotic crisis occurred at nearly the same time in terrestrial and marine environments during Permian-Triassic interval; however the extinction patterns and processes are different. The extinction pattern of the terrestrial plants shows a major decline at the PTB after long-term evolution, followed by a retarded extinction of the relicts in the earliest Triassic.
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影响因子：
56.9
作者：
D. Erwin
通讯作者：
D. Erwin
影响因子：
5
作者：
T.E Krogh
通讯作者：
T.E Krogh
DOI：
10.1017/cbo9780511529498.011
发表时间：
1992
期刊：
--
影响因子：
--
作者：
Ding Meihua
通讯作者：
Ding Meihua
影响因子：
5.8
作者：
A. Draut;P. Clift
通讯作者：
A. Draut;P. Clift
影响因子：
5.3
作者：
R. Mundil;I. Metcalfe;K. Ludwig;P. Renne;F. Oberli;R. Nicoll
通讯作者：
R. Mundil;I. Metcalfe;K. Ludwig;P. Renne;F. Oberli;R. Nicoll