High resolution Ordovician (Floian-Sandbian) carbon isotope stratigraphy from the Jiangnan slope, South China: The first complete record of the MDICE in δ13Corg and its global significance
Luan X, Calner M, Gong F, Lehnert O, Yan G, Zhang Y, Zhang Z, Wu R (2025)
Publication Language: English
Publication Type: Journal article
Publication year: 2025
Journal
Book Volume: 679
Article Number: 113227
DOI: 10.1016/j.palaeo.2025.113227
Abstract
The Middle Darriwilian Isotopic Carbon Excursion (MDICE) is one of the globally recognized positive excursions in carbon isotope chemostratigraphy, but mainly documented by δ13Ccarb data in previous research. In this paper, new stable organic carbon isotope data (δ13Corg) are presented from the Hule-1 core from the southern Anhui Province of southern China. The core constitutes an Ordovician siliciclastic succession deposited in the upper Jiangnan slope. The Ordovician graptolite biostratigraphy of this area is already well established, and ranges from the Baltograptus deflexus Zone (Floian) to the Nemagraptus gracilis Zone (Sandbian). Based on the well-constructed graptolite biostratigraphy, a low-amplitude positive excursion of middle–late Darriwilian age within the Hulo Formation is confidently identified as the MDICE. The excursion has an amplitude of ca. 1.1‰ starting from the value of −28.0‰ near the base of this formation, reaching a peak at −26.9‰ in the middle, and decreasing to −28.5‰ in its upper part. Therefore, it reveals to our knowledge the globally best preserved and most complete δ13Corg record of MDICE hitherto. Our data elucidate the stratigraphic significance of the MDICE also in deeper depositional environments and as a tool for correlation across different lithofacies belts. The inferred perturbation of the global carbon cycle during this time interval was presumably more pronounced than previously thought, confirming that the Darriwilian was a critical time slice in terms of environmental and biosphere changes.
Authors with CRIS profile
Involved external institutions
中国科学院南京地质古生物研究所 / Nanjing Institute of Geology and Paleontology (NIGPAS)
China (CN)
Lund University / Lunds universitet
Sweden (SE)
Institute of Geology and Geophysics, Chinese Academy of Sciences
China (CN)
China (CN)
Lund University / Lunds universitet
Sweden (SE)
Institute of Geology and Geophysics, Chinese Academy of Sciences
China (CN)
How to cite
APA:
Luan, X., Calner, M., Gong, F., Lehnert, O., Yan, G., Zhang, Y.,... Wu, R. (2025). High resolution Ordovician (Floian-Sandbian) carbon isotope stratigraphy from the Jiangnan slope, South China: The first complete record of the MDICE in δ13Corg and its global significance. Palaeogeography, Palaeoclimatology, Palaeoecology, 679. https://doi.org/10.1016/j.palaeo.2025.113227
MLA:
Luan, Xiaocong, et al. "High resolution Ordovician (Floian-Sandbian) carbon isotope stratigraphy from the Jiangnan slope, South China: The first complete record of the MDICE in δ13Corg and its global significance." Palaeogeography, Palaeoclimatology, Palaeoecology 679 (2025).
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