Pulsed volcanic combustion events coincident with the end-Permian terrestrial disturbance and the following global crisis
Pulsed volcanic combustion events coincident with the end-Permian terrestrial disturbance and the following global crisis
复制标题
DOI：
10.1130/g48022.1
复制
发表时间：
2021-03-01
期刊：
影响因子：
5.8
通讯作者：
Tian, Li
中科院分区：
文献类型：
--
作者：
Kaiho, Kunio;Aftabuzzaman, Md.;Tian, Li
西伯利亚圈闭大火成岩省（LIP）的喷发被认为引发了二叠纪-三叠纪生物危机，这是中生代最大的一次大规模喷发。汞浓度富集已被广泛用作火山输入沉积物的代表，特别是对于古代LIP喷发。然而，在陆地和海洋领域的岩浆脉冲与灭绝事件的详细相关性还没有完全解决。在这里，我们使用成对的晕苯（一种六环多环芳烃，高温燃烧代理）和汞尖峰作为LIP定位的精细代理。在中国南方和意大利的地层剖面记录中，我们发现了两组成对的晕苯-汞尖峰，伴随着陆地植物生物标志物尖峰，随后随着陆地生态干扰和海洋后生动物的灭绝而迅速减少。每个短期事件可能是由西伯利亚圈闭LIP初始岩床就位期间沉积烃的高温燃烧引起的。这些数据表明，离散的火山爆发可能导致陆地生态系统危机，随后是-60 k. y的海洋生态系统危机，陆地生态系统受到的全球环境变化破坏比海洋生态系统小。
Eruption of the Siberian Traps large igneous province (LIP) is thought to have triggered the Permian-Triassic biological crisis, the largest of the Phanerozoic mass extinctions. Mercury concentration enrichments have been widely used as a proxy for volcanic inputs to sediments, especially for ancient LIP eruptions. However, detailed correlations of magmatic pulses with extinction events in the terrestrial and marine realms are not fully resolved. Here we use paired coronene (a six-ring polycyclic aromatic hydrocarbon, a high-temperature combustion proxy) and mercury spikes as a refined proxy for LIP emplacement. In records from stratigraphic sections in south China and Italy, we identify two sets of paired coronene-mercury spikes accompanied by land plant biomarker spikes, followed by a rapid decrease coinciding with terrestrial ecological disturbance and extinction of marine metazoans. Each short-term episode is likely caused by high-temperature combustion of sedimentary hydrocarbons during initial sill emplacement of the Siberian Traps LIP. These data indicate that discrete volcanic eruptions could have caused the terrestrial ecosystem crisis followed by the marine ecosystem crisis in -60 k.y., and that the terrestrial ecosystem was disrupted by smaller global environmental changes than the marine ecosystem.