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- W2886088277 abstract "To examine environmental changes in the biosphere during the Triassic–Jurassic transition, with a particular focus on the global carbon cycle related to Central Atlantic Magmatic Provinces (CAMP) volcanism in the mid-Panthalassa, we established stratigraphic δ13Corg variations using Rhaetian (Late Triassic) to Hettangian (Early Jurassic) shales interbedded within deep-sea cherts in the Katsuyama section in the Mino-Tanba belt, SW Japan. High-resolution record of Rhaetian to Hettangian δ13Corg values in the mid-Panthalassa contain three distinct negative carbon isotopic excursions (NCIEs) before and across the Triassic–Jurassic boundary (TJB): the Rhaetian NCIE1 and NCIE2 show a deviation of 5.0‰ from ca. −24.0‰ to ca. −29.0‰, whereas NCIE3 across the TJB shows a 3.5‰ deviation from ca. −23.5‰ to ca. −27.0‰. Our newly obtained NCIEs in the deep mid-Panthalassa can be correlated with the δ13Corg records in the shallow-marine Tethyan regions (i.e., precursor, initial, and main CIEs), suggesting that three NCIEs in the Tethys and mid-Panthalassa likely reflected the global perturbations of the carbon cycle. Three NCIEs before and across the TJB can be interpreted as the consequence of the multiple CAMP volcanic episodes; i.e., the release of thermogenic methane from organic-rich sediments by CAMP intrusive rocks for NCIE1 and large-scale volcanically derived carbon species for NCIE2 and NCIE3. In addition, progressive increase of atmospheric pCO2 throughout three NCIEs was possibly attributed to accumulation of volcanically derived CO2 from multiple CAMP eruptions, which resulted in the development of ocean acidification across the TJB. On the other hand, in view of the oxic conditions in the deep mid-Panthalassa during three NCIEs, the development of coeval oceanic anoxic–euxinic conditions was restricted solely to shallow-marine regions. Therefore, ocean acidification together with localized shallow-marine anoxia acted as environmental stresses on the biosphere, which eventually resulted in the severe biotic crisis at the end of the Triassic." @default.
- W2886088277 created "2018-08-22" @default.
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- W2886088277 date "2018-10-01" @default.
- W2886088277 modified "2023-10-18" @default.
- W2886088277 title "Global perturbations of carbon cycle during the Triassic–Jurassic transition recorded in the mid-Panthalassa" @default.
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- W2886088277 doi "https://doi.org/10.1016/j.epsl.2018.07.026" @default.
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