Changes in nitrate availability (fassimilator), upwelling intensity, temperature, and redox conditions in South China during the Early Triassic (IMAGE)
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(a) Early Triassic timescale (Tong et al., 2019); (b) Changes in marine nitrate availability (fassimilator; black line) and its 68% confidence interval (shaded band) in South China. The Early Triassic is subdivided into three stages (I–III); (c) Upwelling intensity index (ETR). Values at the right of the dashed line indicate strong upwelling conditions (Saito et al., 2013); (d) Sea surface temperatures (red line) in South China, with the shaded band representing the 68% confidence interval; (e) Evolution of marine redox conditions, integrating data from multiple sections: Zuodeng (Wei et al., 2015), Jurong (Qiu et al., 2019), Xiakou (Fang et al., 2021), Chaohu (Huang et al., 2017), Bianyang (Tian et al., 2014), and Jiarong (Sun et al., 2015). The four horizontal color bands (from bottom to top) correspond to the Griesbachian, Dienerian, Smithian, and Spathian substages. Abbreviations: Se.–Series, St.–Stage, Su.–Substage, Lop.–Lopingian, Chan.–Changhsingian, Grie.–Griesbachian, Die.–Dienerian, Smi.–Smithian, Ani.–Anisian, Aeg.–Aegean, Mid. T.–Middle Triassic.
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