| Title | Osmium-isotope evidence for volcanism across the Wuchiapingian-Changhsingian boundary interval |
| |
| Author | Liu, Z Y; Selby, D; Zhang, H; Zheng, Q F; Shen, S Z; Sageman, B B; Grasby, S E ; Beauchamp, B |
| Source | Chemical Geology vol. 529, 119313, 2019 p. 1-7, https://doi.org/10.1016/j.chemgeo.2019.119313  Open Access |
| Image |  |
| Year | 2019 |
| Alt Series | Natural Resources Canada, Contribution Series 20200177 |
| Publisher | Elsevier |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf; html |
| Province | Canada |
| NTS | 49G/05 |
| Area | Meishan; 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 |
| Subjects | stratigraphy; 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 |
| Illustrations | geoscientific sketch maps; lithologic sections; profiles |
| Program | GEM2: Geo-mapping for Energy and Minerals Western Arctic, High Arctic LIP |
| Released | 2019 10 15 |
| Abstract | Two 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. |
| GEOSCAN ID | 326589 |
|
|