Climate warming in the latest Permian and the Permian-Triassic mass extinction
Climate warming in the latest Permian and the Permian-Triassic mass extinction
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DOI：
10.1130/g32707.1
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发表时间：
2012-03-01
期刊：
影响因子：
5.8
通讯作者：
Sun, Yadong
中科院分区：
文献类型：
--
作者：
Joachimski, Michael M.;Lai, Xulong;Sun, Yadong
高分辨率氧同位素记录记录了跨越二叠系-三叠系(P-Tr)界线的全球变暖的时间和程度。眉山和上思剖面(中国南段)牙形石磷灰石中磷结合氧的氧同位素比值在二叠纪末期下降了千分之2，转化为低纬地表水温升高8℃。氧同位素漂移与碳酸盐碳同位素比值的负移相吻合，表明西伯利亚圈闭火山作用和相关过程向海洋-大气系统添加了同位素轻碳，导致了更高的温室气体水平和全球变暖。主要的温度上升开始于主要灭绝阶段之前，最高和有害的温度记录在最新的二叠纪(眉山：27层)。气候变暖与物种灭绝主脉的重合表明，全球变暖是海洋和陆地生态系统崩溃的原因之一。此外，三叠纪早期非常温暖的气候条件可能是二叠纪-三叠纪危机后恢复延迟的主要原因。
High-resolution oxygen isotope records document the timing and magnitude of global warming across the Permian-Triassic (P-Tr) boundary. Oxygen isotope ratios measured on phosphate-bound oxygen in conodont apatite from the Meishan and Shangsi sections (South China) decrease by 2 parts per thousand in the latest Permian, translating into low-latitude surface water warming of 8 degrees C. The oxygen isotope shift coincides with the negative shift in carbon isotope ratios of carbonates, suggesting that the addition of isotopically light carbon to the ocean-atmosphere system by Siberian Traps volcanism and related processes resulted in higher greenhouse gas levels and global warming. The major temperature rise started immediately before the main extinction phase, with maximum and harmful temperatures documented in the latest Permian (Meishan: bed 27). The coincidence of climate warming and the main pulse of extinction suggest that global warming was one of the causes of the collapse of the marine and terrestrial ecosystems. In addition, very warm climate conditions in the Early Triassic may have played a major role in the delayed recovery in the aftermath of the Permian-Triassic crisis.