The Siberian Traps and the End-Permian mass extinction:a critical review

查看全文 作　　者：Andy [1]SAUNDERS;Marc [1]REICHOW

机构地区：[1]Department of Geological Sciences,University of Leicester

出　　处：《Chinese Science Bulletin》索引2009年第54卷第1期,共18页

基　　金：Supported by the Natural Environment Research Council,UK (Grant No.NE/C003276) 摘　　要：The association between the Siberian Traps,the largest continental flood basalt province,and the largest-known mass extinction event at the end of the Permian period,has been strengthened by re-cently-published high-precision 40Ar/39Ar dates from widespread localities across the Siberian prov-ince[1]. We argue that the impact of the volcanism was amplified by the prevailing late Permian envi-ronmental conditions―in particular,the hothouse climate,with sluggish oceanic circulation,that was leading to widespread oceanic anoxia. Volcanism released large masses of sulphate aerosols and carbon dioxide,the former triggering short-duration volcanic winters,the latter leading to long-term warming. Whilst the mass of CO2 released from individual eruptions was small compared with the total mass of carbon in the atmosphere-ocean system,the long ‘mean lifetime’ of atmospheric CO2,com-pared with the eruption flux and duration,meant that significant accumulation could occur over periods of 105 years. Compromise of the carbon sequestration systems (by curtailment of photosynthesis,de-struction of biomass,and warming and acidification of the oceans) probably led to rapid atmospheric CO2 build-up,warming,and shallow-water anoxia,leading ultimately to mass extinction. 关键词：西伯利亚二叠纪温室气候海洋缺氧 CO2 SO2

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The Siberian Traps and the End-Permian mass extinction:a critical review

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