火山作用
地质学
生物集群灭绝
火成岩大省
Mercury(编程语言)
二叠纪
消光(光学矿物学)
地球科学
古生物学
岩浆作用
构造学
人口
生物扩散
构造盆地
人口学
社会学
计算机科学
程序设计语言
作者
Hu Huang,Changzhou Deng,Stephen E. Grasby,Peter A. Cawood,Mingcai Hou,Chenchen Yang,Mingshi Feng,Fuhao Xiong,Hanting Zhang,Runsheng Yin
出处
期刊:Geological Society of America Bulletin
[Geological Society of America]
日期:2024-09-30
摘要
The mid-Capitanian (Middle Permian) extinction has been widely attributed to the eruption of the Emeishan large igneous province. Here, we investigate the nature and timing of this link by determining Hg concentrations and isotopic compositions of limestones from the Xiongjiachang section of southwestern China, where Emeishan basalts directly overlie sediments recording the mid-Capitanian extinction horizon. Results show an initial Hg-enrichment interval ∼2.2 m below the mid-Capitanian extinction horizon. Positive Δ199Hg values in the Hg-enrichment interval suggest enhanced volcanic Hg influx into the ocean via atmospheric Hg(II) deposition. The late stage of the mid-Capitanian extinction interval has lower Δ199Hg values, which indicates enhanced input of terrestrial Hg due to ecosystem collapse and soil erosion. The results of this study provide evidence that the Emeishan large igneous province eruption occurred earlier than the mid-Capitanian extinction, and establish a more reasonable temporal link between Emeishan large igneous province volcanism and the mid-Capitanian extinction.
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