Abstract
The Early-Middle Permian δ13Ccarb variations are recorded by the marine carbonates of the Luduba section in the northern margin of the South China Block. The investigated interval (~ 300 m) spans the Chihsia and Maokou formations. Preservation of the investigated micritic carbonates was evaluated by multiple petrographic and geochemical screening tools. The δ13Ccarb and δ18O values of near-primary micrites range from 2.3 to 5.0‰ (VPDB) and from − 6.4 to − 3.4‰ (VPDB), respectively, showing insignificant correlation (R2 = 0.13). Similarly, the Mn/Sr ratios show insignificant correlation with δ13Ccarb or δ18O ratios. In addition, the Al and Sr concentrations exhibit insignificant correlation, which suggests preservation of at least near-primary δ13Ccarb signatures that can be utilized to construct a reliable C-isotope profile of the equatorial eastern Paleo-Tethys for global correlations. The C-isotope profile exhibits distinct short-time negative shifts superimposed on the general long-term trend of increase in δ13Ccarb values. The long-term trend likely reflects a consistent global sea-level rise during the Early Guadalupian, which was associated with one of the largest Permian transgressions. The general sea-level rise was disrupted by few minor short-term sea-level low-stands associated with negative δ13Ccarb shifts (~ 1–2 ‰) on the C-isotope profile, which are associated with similar minor positive 87Sr/86Sr shifts (~ 0.0005 each) on the Sr isotope profile and with Al enrichment, possibly caused by the combination of global eustasy and regional tectonics in South China. Two negative δ13Ccarb shifts have been recorded in the lower and upper Chihsia Formation that can be correlated with the Early Kungurian and the Kungurian/Roadian boundary, respectively. Also, the Maokou Formation records a middle negative shift that inferred correlates with the Early Wordian. These three negative δ13Ccarb shifts are globally comparable with those documented by both the eastern Paleo-Tethys and western Panthalassa Early-Middle Permian sedimentary records and can be utilized as chemostratigraphic markers. The general increase in the δ13Ccarb values peaks at ~ 5 ‰ near the top of the Maokou Formation that resembles the Kamura event recorded in Tethy but there are issues with the origin and timing of this positive δ13Ccarb excursion. The petrological characteristics of the Luduba section carbonates support the suggested scenario of the general long-term trend of sea-level rise.
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Acknowledgements
The authors thank the four anonymous reviewers whose comments/suggestions helped improve and clarify this manuscript. The authors thank Drs. Zhi-Qiang Shi, James Ogg, Zhong-Qiang Chen, Sheng-Xian Zhu, Guo-Qiang Luan, Jie Li and Xin Jin for their valuable and constructive suggestions during the performance of this research work. This study was supported by the National Natural Science Foundation of China (grant no. 41872109), the Everest Scientific Research Program of Chengdu University of Technology (grant no. 2020ZF11402), and the Open Fund (grant no. PLC20180507) of the State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Chengdu University of Technology).
Funding
National Natural Science Foundation of China, grant/award numbers: 41402104 and 41602118; Open Fund of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Chengdu University of Technology), grant/award numbers: PLC20180507.
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13146_2021_743_MOESM1_ESM.xlsx
Supplementary file1 Elemental and isotopic geochemical compositions of Luduba section carbonates. Values preceded by the sign “<” are below the detection limit (XLSX 5675 KB)
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Li, Q., Azmy, K., Yang, S. et al. Early-Middle Permian carbon-isotope stratigraphy of marine carbonates in the northern edge of the South China: implications for global correlation. Carbonates Evaporites 37, 1 (2022). https://doi.org/10.1007/s13146-021-00743-4
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DOI: https://doi.org/10.1007/s13146-021-00743-4