PRE-MASS EXTINCTION DECLINE OF LATEST PERMIAN AMMONOIDS
PRE-MASS EXTINCTION DECLINE OF LATEST PERMIAN AMMONOIDS
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DOI：
10.1130/abs/2017am-301914
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发表时间：
2017-10
期刊：
影响因子：
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通讯作者：
W. Kiessling;Martin Schobben;A. Ghaderi;V. Hairapetian;L. Leda;D. Korn
中科院分区：
文献类型：
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作者：
W. Kiessling;Martin Schobben;A. Ghaderi;V. Hairapetian;L. Leda;D. Korn
毁灭性的二叠纪末大规模灭绝被广泛认为是由西伯利亚岩浆活动大规模快速释放温室气体造成的。虽然近距离灭绝机制存在争议，但人们普遍认为，一个主要的灭绝脉冲发生在生物地层学定义的二叠纪-三叠纪边界之下。我们的地层置信区间的统计分析不符合一个单一的二叠纪末灭绝脉冲的菊石在伊朗。在过去的700 k.y中观察到高周转率和灭绝脉冲。二叠纪时期的两个广泛分离的部分代表了一个更大的地区。对身体大小和形态复杂性的分析支持在同一时间段内逐渐下降。其他地区有时也报告了类似的大规模灭绝前的下降和碳循环的干扰，这表明在传统的主要灭绝脉冲之前，全球范围内存在广泛但往往被忽视的环境恶化。
The devastating end-Permian mass extinction is widely considered to have been caused by large-scale and rapid greenhouse gas release by Siberian magmatism. Although the proximate extinction mechanisms are disputed, there is widespread agreement that a major extinction pulse occurred immediately below the biostratigraphically defined Permian-Triassic boundary. Our statistical analyses of stratigraphic confidence intervals do not comply with a single end-Permian extinction pulse of ammonoids in Iran. High turnover rates and extinction pulses are observed over the last 700 k.y. of the Permian period in two widely separated sections representative of a larger area. Analyses of body sizes and morphological complexity support a gradual decline over the same interval. Similar pre-mass extinction declines and disturbances of the carbon cycle have sometimes been reported from other regions, suggesting a widespread, but often overlooked, environmental deterioration at a global scale, well before the traditional main extinction pulse.