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Sulfur isotopic evidence for global marine anoxia and low seawater sulfate concentration during the Late Triassic by Wei Tang; Jian Wang; Hengye Wei; Xiugen Fu; Puyang Ke is a Earth and Planetary Sciences article available to read on EtoBox.

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Marine anoxia during the Late Triassic has mostly been reported from the western Tethys and Panthalassa, which were near the Central Atlantic Magmatic Province (CAMP), but whether it developed in global open oceans (e.g., the eastern Tethys) is unknown. Whether the marine anoxia was global or regional requires more research. Here, we present carbonate-associated sulfate (CAS) and pyrite δ34Spy data for the Late Triassic–Early Jurassic interval from the Wenquan Section in Qiantang Basin, Tibet. We found an 8‰ magnitude of Rhaetian positive sulfur isotope excursion (RPSE) of δ34SCAS values, followed by a decrease in the isotopic offset between δ34SCAS and δ34SPY (i.e., Δ34SCAS-PY). The decline in the isotopic offset between δ34SCAS and δ34Spy may be due to low oceanic sulfate concentrations (∼0.1–0.3 mM) during the Late Triassic–Early Jurassic, according to our modeling. The RPSE found in this study was also found in western Tethys and eastern Panthalassa. Our sulfur cycle model shows that the RPSE is related to a 3.3–4.3-fold increase in the pyrite burial flux over a short time interval (70–106 kyr) and that a low sulfate concentration of 0.5 mM is needed to reproduce the magnitude

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Author

Wei Tang; Jian Wang; Hengye Wei; Xiugen Fu; Puyang Ke

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)