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  • 标题:87Sr/86Sr evidence from the epeiric Martin Ridge Basin for enhanced carbonate weathering during the Hirnantian
  • 本地全文:下载
  • 作者:Dongping Hu ; Xiaolin Zhang ; Lian Zhou
  • 期刊名称:Scientific Reports
  • 电子版ISSN:2045-2322
  • 出版年度:2017
  • 卷号:7
  • 期号:1
  • DOI:10.1038/s41598-017-11619-w
  • 语种:English
  • 出版社:Springer Nature
  • 摘要:A pronounced positive δ(13)C excursion in the Hirnantian Age has been documented globally, reflecting large perturbations of carbon cycling in the Late Ordovician oceans. Increased organic-carbon burial or enhanced carbonate weathering during glacioeustatic sea-level regression has been proposed to account for this anomalous C-isotope excursion. To test the two competing hypotheses, we measured (87)Sr/(86)Sr and δ(13)C of carbonates from the Copenhagen Canyon section in Nevada, USA. Our data reveal two rapid negative (87)Sr/(86)Sr shifts that coincide with two prominent positive δ(13)C excursions and glacial advances. Numerical model simulations suggest that enhanced weathering of carbonates driven by glacio-eustatically controlled sea-level fall is required to produce the observed drops of (87)Sr/(86)Sr and the coeval large positive δ(13)C excursions, possibly with or without increased organic carbon burial.
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