Radiation and extinction patterns in Permian floras from North China as indicators for environmental and climate change
Radiation and extinction patterns in Permian floras from North China as indicators for environmental and climate change
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DOI：
10.1144/0016-76492010-042
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发表时间：
2011-02
影响因子：
2.7
通讯作者：
L. Stevens;J. Hilton;D. Bond;I. Glasspool;P. Jardine
中科院分区：
文献类型：
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作者：
L. Stevens;J. Hilton;D. Bond;I. Glasspool;P. Jardine
翻译后摘要：中国北方二叠纪大陆序列包含以前未被认识到的植物辐射和灭绝升高的事件。最早的灭绝，在较低的Shihhotse组（Roadian，Guadalupian），记录了45%的植物物种的损失，并暂时与全球灭绝之间的dinocephalian爬行动物。通过对山西Illawara逆冲序列和古地磁极性序列与全球古地磁历史的对比，确定了两个较年轻的逆冲序列。缺失的数据从山西序列进行评估，使用一种新的方法估计可能的最大和最小的序列变化，提供年龄估计后Ilawara事件在中国北方。第二次灭绝发生在上石盒子组中部，其时间可追溯到卡皮坦中期，当时约有56%的植物物种消失，这与中国南方峨眉山大火成岩省火山活动的两个阶段相吻合，而这两个阶段以前与卡皮坦中期的海洋生物大灭绝有关。最年轻的灭绝在上石盒子组（Capitanian晚期至Wuchapingian中期）是灾难性的，代表了序列范围的结束。沉积相的变化表明，它与全球气候变暖和干燥有关。灭绝事件的其他可行的因果机制包括板块运动和碰撞，全球气候变化，火山活动和生物竞争。
Abstract: Permian continental sequences from North China contain previously unrecognized episodes of plant radiation and elevated extinction. The earliest extinction, in the Lower Shihhotse Formation (Roadian, Guadalupian), records a 45% floral species loss and is tentatively correlated with global extinctions amongst dinocephalian reptiles. Two younger extinctions are dated by correlating the Illawara Reversal and palaeomagnetic polarity sequences from Shanxi Province against global palaeomagnetic history. Missing data from the Shanxi sequence are evaluated using a novel approach estimating likely maximum and minimum sequence changes that provide age estimates for post-Illawara events in North China. The second extinction in the middle Upper Shihhotse Formation is more significant and is dated to the mid-Capitanian, with a loss of 56% of plant species coinciding with two phases of volcanism of the Emeishan Large Igneous Province in South China, previously linked to the mid-Capitanian marine mass extinction. The youngest extinction in the upper Upper Shihhotse Formation (late Capitanian to mid-Wuchapingian) is catastrophic and represents the end of range in the sequence. Changes in sedimentary facies suggest it to be related to global climatic warming and drying. Other viable causal mechanisms for the extinction episodes include plate motion and collision, global climate change, volcanism and biological competition.