Recycled carbon degassed from the Emeishan plume as the potential driver for the major end-Guadalupian carbon cycle perturbations  

作　　者：Jiang Zhu Zhaochong Zhang M.Santosh Shucheng Tan Yinan Deng Qiuhong Xie 

机构地区：[1]School of Earth Sciences,Yunnan University,Kunming 650500,China [2]State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China [3]Department of Earth Sciences,University of Adelaide,SA 5005,Australia

出　　处：《Geoscience Frontiers》2021年第4期86-92,共7页地学前缘（英文版）

基　　金：by the National Key Research and Development Program of China(2016YFC0600502);the National Natural Science Foundation of China(41761134086,42002062);111 Project(B18048);China Postdoctoral Science Foundation(2020 M673309);Postdoctoral Science Foundation of Yunnan Province(W8163007)。

摘　　要：Massive gas emissions(e.g.,CO_(2),CH_(4) and SO_(2))during the formation of large igneous provinces(LIPs)have been suggested as the primary cause of dramatic climatic change and the consequent ecological collapses and biotic crises.Thermogenic carbon of crustal sediments induced by intrusive magmatism throughout the LIPs is considered as the primary trigger for environmental catastrophe including mass extinction,as illustrated in the case of the Emeishan LIP in Southwest China.Herewe evaluate the Emeishan LIP to address the causal link between carbon degassing and environmental crises during the end-Guadalupian of Middle Permian.An assessment of the carbon flux degassed from recycled oceanic crust in the Emeishan plume shows that recycled oceanic crust contributed significantly to the carbon flux.Using evidence fromcarbonate carbon isotopic records at the Gualupian-Lopingian(G-L)boundary stratotype at Penglaitan of South China,our study suggests that carbon degassed from massive recycled components in the Emeishan plume served as a major end-Guadalupian(Middle Permian)carbon isotope excursion.The model based on the Emeishan LIP also offers new insights into the important role of recycled carbon released from other LIPs in climatic change and mass extinctions,as in the cases of the end-Permian Siberian and end-Cretaceous Deccan Traps.Our work highlights that carbon released from subducted slabs is returned to the atmosphere via upwelling mantle plumes,which could drive global climatic change and mass extinction.

关 键 词：Recycled carbon Thermogenic carbon Carbon isotope excursion Environmental catastrophe Emeishan large igneous province 

分 类 号：X16[环境科学与工程—环境科学] X14