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Roller-coaster atmospheric-terrestrial-oceanic-climatic system during ordovician-Silurian transition:Consequences of large igneous provinces

引用

Geoscience Frontiers 2023年第3期14卷 148-162页

作者： Licai Song Qing Chen Huijun Li Changzhou Deng School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100083China Key Laboratory of Paleomagnetism and Tectonic Reconstruction Institute of GeomechanicsChinese Academy of Geological SciencesChina Geological SurveyMinistry of Natural ResourcesBeijing 100081China State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and PalaeoenvironmentChinese Academy of SciencesNanjing 210008China

The ordovician-Silurian transition(OST)hosted profound and frequent changes in the atmospheric-terres trial-oceanic-climatic system(ATOCS).Previous studies have found contrasting stages for such changes,primarily based on hiatus-interrupted ***,the dominant driving factors and mechanisms reconciling such frequent changes remain *** isotopes,which undergo both massdependent and mass-independent fractionation,can provide critical insights into the deep-time ATOCSs,especially for those impacted by large igneous provinces(LIPs)***,we build a highresolution multi-proxy record of Hg(concentrations and isotopic compositions)combined with organic carbon isotopes(δ^(13)Corg)and whole-rock geochemical data(including trace elements and phosphorus)from continuous cores in the Yangtze Platform,South *** data,combined with reported ones,indicate the occurrence of LIP eruptions against localized volcanism,and four successive,yet contrasting stages of ATOCSs during the ***,we identified the coupling between two-pulse LIP magmatism and extreme ATOCSs,each with special pCO_(2),weathering rate,primary productivity,redox condition,climatic mode,and biotic *** stage I,the first pulse of LIP magmatism triggered global warming,enhanced terrestrial weathering,oceanic acidification,eutrophication,anoxia,P recycling,and thereby widespread deposition of black *** stage II,the Hirnantian glaciation and oxygenation arose from the intense chemical weathering and black shale deposition of stage I;slashed terrestrial weathering and oceanic oxygenation facilitated CO_(2) *** stage III,another pulse of LIP magmatism triggered the de-glaciation,and the ATOCS was largely similar to that of stage *** led to another round of oxygenation and positive d13Corg excursion in stage *** with the environmental pressure by the peculiar ATOCS of each stage,their transitions might have been more devastating in triggeri

关键词： Earth system Large igneous province Mercury isotope late ordovician mass extinction Phosphorus recycling

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