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- W2377668839 abstract "Permian Guadalupian-Lopingian boundary profile at the Penglaitan Section of Laibin,Guangxi Province was ratified by the IUGS as the Global Standard Stratotype-section and Point(GSSP),in which a global important biological extinction event occurred.The samples in the Penglaitan section are usually high in SiO2 contents(except that 3 samples with contents of SiO2 are lower than 10%,and the others are more than 17%,averaging 43.44%),with the ratios of(MgO)/(Al2O3) 50,the ratios of Sr/Br 0.1,the low ratios of MgO/CaO(most are lower than 0.2),the ratios V/(V+Ni)(0.46),and distinct depletion of Ce and Eu.These geochemical characters imply that they were formed in a shallow ocean of relatively oxidized environment,which offered abundant silicon.Both eNd(t)(-7.5 to-3.3) and 87Sr/86Sr(0.70705~0.70739) are located within the range of Upper Permian in the plot of global evolution curve vs.ocean Nd,Sr isotopes.The organic δ13C(-26.74‰ to-23.23‰) varies remarkable;obvious negative excursion occurs especially close to the boundaries of Guadalupian-Lopingian and Maokou-Heshan(shifting up to 3.4‰),and are parallel to inorganic organic δ13C values,suggesting a mass extinction occurring in the boundary.Several hypotheses were proposed to interpret the end-Guadalupian mass extinction,e.g.the rise of sea level.This paper proposes that the main reason responsible for the mass extinction at the end-Guadalupian is the activity of the Super Plume represented by the Emeishan Large Igneous Province(LIP) and following the environmental impact." @default.
- W2377668839 created "2016-06-24" @default.
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- W2377668839 date "2009-01-01" @default.
- W2377668839 modified "2023-09-25" @default.
- W2377668839 title "Elements and Isotopic Geochemistry of Guadalupian-Lopingian Boundary Profile at the Penglaitan Section of Laibin,Guangxi Province,and Its Geological Implications" @default.
- W2377668839 hasPublicationYear "2009" @default.
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