Journal
GEOLOGICAL JOURNAL
Volume 56, Issue 5, Pages 2772-2784Publisher
WILEY
DOI: 10.1002/gj.4068
Keywords
carbon isotope stratigraphy; Guttenberg Isotopic Carbon Excursion; Middle Darriwilian Isotopic Carbon Excursion; Middle to Late Ordovician; South China
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Funding
- National Natural Science Foundation of China [41672008, 41702005]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB26000000]
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This study conducted high-resolution carbon isotope chemostratigraphy on Middle to Late Ordovician carbonates in South China, and identified three carbon isotope shifts. These findings provide new evidence for changes in the global carbon cycle from Darriwilian to Early Katian, which may have been influenced by global climate and primary productivity changes.
Middle to Late Ordovician carbonates were collected in South China (Anhui Province) from the Kuniutan, Datianba, and Pagoda formations in the Dingxiang and Daling sections and analysed for high-resolution carbon isotope chemostratigraphy. An increase by 0.4 parts per thousand in delta C-13(carb) is observed in the upper part of the Kuniutan Formation (Eoplacognathus pseudoplanus Biozone), representing the rising limb of the Middle Darriwilian Isotopic Carbon Excursion (MDICE). In the upper part of the Datianba Formation, positive shifts of ca. 1 parts per thousand are recorded in the studied section which compare with the carbon shifts reported in North America and Baltoscandia. A pronounced positive delta C-13(carb) excursion of ca. 1.5 parts per thousand from the lower part of the Pagoda Formation can be correlated with the global Guttenberg Isotopic Carbon Excursion (GICE). The documentation of three carbon isotope shifts in this study provides new evidence for changes in the global carbon cycle from Darriwilian to Early Katian which could have been influenced by changes in global climate and primary productivity.
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