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A refined stratigraphic framework for the Tremadocian–Floian stage boundary (Lower Ordovician) in the North China Block

Chi, Xiang Ri ; Yan, Guan Zhou LU ; Calner, Mikael LU orcid ; Gong, Fang Yi ; Luan, Xiao Cong and Wu, Rong Chang (2026) In Palaeoworld 35(4).
Abstract

A high-resolution integrated bio-chemostratigraphic framework is established for the upper Tremadocian to lower Floian (Lower Ordovician) succession of the North China Block, based on new conodont and carbon isotope (δ13Ccarb) data from the Jiguanshan and Wudingshan sections in Liaoning Province, northeastern China. Thirty conodont species of 19 genera were identified from the two sections. Based on these we recognized four conodont biozones, in ascending order: the Colaptoconus quadraplicatus, the Paltodus deltifer, the Tropodus bifidus, and the Serratognathus bilobatus biozones. Within this interval, the δ13Ccarb profile exhibits a distinct positive excursion, followed by a more protracted... (More)

A high-resolution integrated bio-chemostratigraphic framework is established for the upper Tremadocian to lower Floian (Lower Ordovician) succession of the North China Block, based on new conodont and carbon isotope (δ13Ccarb) data from the Jiguanshan and Wudingshan sections in Liaoning Province, northeastern China. Thirty conodont species of 19 genera were identified from the two sections. Based on these we recognized four conodont biozones, in ascending order: the Colaptoconus quadraplicatus, the Paltodus deltifer, the Tropodus bifidus, and the Serratognathus bilobatus biozones. Within this interval, the δ13Ccarb profile exhibits a distinct positive excursion, followed by a more protracted negative shift. This anomaly is interpreted as the Late Tremadocian Isotopic Carbon Excursion (LTICE), which was recently named to overcome challenges in regional and global chemostratigraphic correlation of the Tremadocian–Floian stage boundary interval. The LTICE extends from the upper C. quadraplicatus Biozone to the lower S. bilobatus Biozone. Integration of conodont biostratigraphy with carbon isotope chemostratigraphy refines the regional stratigraphic scheme and facilitates correlation of the upper Tremadocian–lower Floian succession between North China, South China, Argentina, Baltica, and North America. In the carbonate-dominated succession in eastern North China, the Tremadocian–Floian stage boundary is placed at the first local occurrence of the conodont Serratognathus bilobatus, a horizon closely coincides with a positive-to-negative shift in the LTICE δ13Ccarb values.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
carbon isotope chemostratigraphy, Conodont biostratigraphy, Late Tremadocian Isotopic Carbon Excursion (LTICE), North China Block, Ordovician
in
Palaeoworld
volume
35
issue
4
article number
201108
publisher
Elsevier
external identifiers
  • scopus:105035898657
ISSN
1871-174X
DOI
10.1016/j.palwor.2026.201108
language
English
LU publication?
yes
id
22e99ea8-08c8-4698-8b28-fe821a14fc08
date added to LUP
2026-05-27 15:03:50
date last changed
2026-05-28 11:44:13
@article{22e99ea8-08c8-4698-8b28-fe821a14fc08,
  abstract     = {{<p>A high-resolution integrated bio-chemostratigraphic framework is established for the upper Tremadocian to lower Floian (Lower Ordovician) succession of the North China Block, based on new conodont and carbon isotope (δ<sup>13</sup>C<sub>carb</sub>) data from the Jiguanshan and Wudingshan sections in Liaoning Province, northeastern China. Thirty conodont species of 19 genera were identified from the two sections. Based on these we recognized four conodont biozones, in ascending order: the Colaptoconus quadraplicatus, the Paltodus deltifer, the Tropodus bifidus, and the Serratognathus bilobatus biozones. Within this interval, the δ<sup>13</sup>C<sub>carb</sub> profile exhibits a distinct positive excursion, followed by a more protracted negative shift. This anomaly is interpreted as the Late Tremadocian Isotopic Carbon Excursion (LTICE), which was recently named to overcome challenges in regional and global chemostratigraphic correlation of the Tremadocian–Floian stage boundary interval. The LTICE extends from the upper C. quadraplicatus Biozone to the lower S. bilobatus Biozone. Integration of conodont biostratigraphy with carbon isotope chemostratigraphy refines the regional stratigraphic scheme and facilitates correlation of the upper Tremadocian–lower Floian succession between North China, South China, Argentina, Baltica, and North America. In the carbonate-dominated succession in eastern North China, the Tremadocian–Floian stage boundary is placed at the first local occurrence of the conodont Serratognathus bilobatus, a horizon closely coincides with a positive-to-negative shift in the LTICE δ<sup>13</sup>C<sub>carb</sub> values.</p>}},
  author       = {{Chi, Xiang Ri and Yan, Guan Zhou and Calner, Mikael and Gong, Fang Yi and Luan, Xiao Cong and Wu, Rong Chang}},
  issn         = {{1871-174X}},
  keywords     = {{carbon isotope chemostratigraphy; Conodont biostratigraphy; Late Tremadocian Isotopic Carbon Excursion (LTICE); North China Block; Ordovician}},
  language     = {{eng}},
  number       = {{4}},
  publisher    = {{Elsevier}},
  series       = {{Palaeoworld}},
  title        = {{A refined stratigraphic framework for the Tremadocian–Floian stage boundary (Lower Ordovician) in the North China Block}},
  url          = {{http://dx.doi.org/10.1016/j.palwor.2026.201108}},
  doi          = {{10.1016/j.palwor.2026.201108}},
  volume       = {{35}},
  year         = {{2026}},
}