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TitleOsmium-isotope evidence for volcanism across the Wuchiapingian-Changhsingian boundary interval
AuthorLiu, Z Y; Selby, D; Zhang, H; Zheng, Q F; Shen, S Z; Sageman, B B; Grasby, S EORCID logo; Beauchamp, B
SourceChemical Geology vol. 529, 119313, 2019 p. 1-7, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20200177
Mediapaper; on-line; digital
File formatpdf; html
AreaMeishan; Shangsi; Lianyuan; Buchanan Lake; Axel Heiberg Island; China
Lat/Long WENS 100.0000 120.0000 40.0000 10.0000
Lat/Long WENS -87.5000 -87.5000 79.5000 79.0000
Subjectsstratigraphy; geochemistry; Nature and Environment; Science and Technology; Upper Permian; isotopic studies; isotopes; osmium; volcanism; carbon isotopes; stratigraphic correlations; paleogeography; Panthallassa Ocean; Paleotethys Sea; Wuchiapingian-Changhsingian Boundary; Emeishan Large Igneous Province; Sverdrup Basin; Phanerozoic; Paleozoic; Permian
Illustrationsgeoscientific sketch maps; lithologic sections; profiles
ProgramGEM2: Geo-mapping for Energy and Minerals Western Arctic, High Arctic LIP
Released2019 10 15
AbstractTwo negative carbon isotope excursions (3.5-6.5 per mille) across the Wuchiapingian-Changhsingian boundary (WCB) are observed globally (sections in China, Canada, and Iran); however, the causative mechanism of these excursions is debated. Here, high-resolution osmium isotope (Os-187/Os-188 or Os-i) chemostratigraphy of four globally correlated WCB sections (3 in China-Meishan, Shangsi and Lianyuan and 1 in Canada - Buchanan Lake) show two separate Osi excursions to less radiogenic compositions that are coincident with the carbon isotope shifts for two of the South China sections (Lianyuan, Meishan). In contrast, only a single Os-i excursion to less radiogenic compositions, coinciding with the earliest Changhsingian carbon isotope shift, is observed for the Shangsi and Buchanan Lake sections. The Os-i shift is interpreted to reflect increased unradiogenic Os input from basaltic magmatism in South China, possibly related to the Emeishan large igneous province (LIP). However, Os-187/Os-188 data suggest that only the earliest Changhsingian volcanism had global impact on both the ocean and atmosphere. The lack of any evidence for a biotic event associated with the WCB therefore may have been due to the more regional rather than global impact of volcanism during the latest Wuchiapingian. In contrast, during the earliest Changhsingian, volcanism was sufficient to cause a more global signal in the ocean osmium record, but was inadequate, or too prolonged, to drive any significant environmental change. Volcanism, however, may have provided the isotopically light carbon that drove the negative carbon isotope excursions across the WCB.
Summary(Plain Language Summary, not published)
This paper applies new tools to try and conduct regional and global correlations of rocks of the same age.

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