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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, Xiaocong ; Calner, Mikael LU orcid ; Gong, Fangyi ; Lehnert, Oliver ; Yan, Guanzhou LU ; Zhang, Yuchen ; Zhang, Zhutong and Wu, Rongchang LU (2025) In Palaeogeography, Palaeoclimatology, Palaeoecology 679.
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,... (More)

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.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Black shale, GOBE, MDICE, Paleoenvironment, South China, δC chemostratigraphy
in
Palaeogeography, Palaeoclimatology, Palaeoecology
volume
679
article number
113227
publisher
Elsevier
external identifiers
  • scopus:105015080994
ISSN
0031-0182
DOI
10.1016/j.palaeo.2025.113227
language
English
LU publication?
yes
id
d9d1c80e-e15c-48b4-af51-6e6c76451488
date added to LUP
2025-10-02 14:38:34
date last changed
2025-10-14 10:58:55
@article{d9d1c80e-e15c-48b4-af51-6e6c76451488,
  abstract     = {{<p>The Middle Darriwilian Isotopic Carbon Excursion (MDICE) is one of the globally recognized positive excursions in carbon isotope chemostratigraphy, but mainly documented by δ<sup>13</sup>C<sub>carb</sub> data in previous research. In this paper, new stable organic carbon isotope data (δ<sup>13</sup>C<sub>org</sub>) 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 δ<sup>13</sup>C<sub>org</sub> 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.</p>}},
  author       = {{Luan, Xiaocong and Calner, Mikael and Gong, Fangyi and Lehnert, Oliver and Yan, Guanzhou and Zhang, Yuchen and Zhang, Zhutong and Wu, Rongchang}},
  issn         = {{0031-0182}},
  keywords     = {{Black shale; GOBE; MDICE; Paleoenvironment; South China; δC chemostratigraphy}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Palaeogeography, Palaeoclimatology, Palaeoecology}},
  title        = {{High resolution Ordovician (Floian-Sandbian) carbon isotope stratigraphy from the Jiangnan slope, South China : The first complete record of the MDICE in δ<sup>13</sup>C<sub>org</sub> and its global significance}},
  url          = {{http://dx.doi.org/10.1016/j.palaeo.2025.113227}},
  doi          = {{10.1016/j.palaeo.2025.113227}},
  volume       = {{679}},
  year         = {{2025}},
}