The record of early Silurian climate changes from South China and Baltica based on integrated conodont biostratigraphy and isotope chemostratigraphy

Yan G, Lehnert O, Männik P, Calner M, Luan X, Gong F, Li L, Wei X, Wang G, Zhan R, Wu R (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Palaeogeography, Palaeoclimatology, Palaeoecology Elsevier

Book Volume: 606

Article Number: 111245

DOI: 10.1016/j.palaeo.2022.111245

Abstract

New conodont and stable isotope data are presented from the classical Baizitian section in the Yanbian County of Sichuan Province, South China. The Telychian to Sheinwoodian strata were sampled and studied for carbon isotope stratigraphy and conodont biostratigraphy. The paired δ¹³Ccarb and δ¹³Corg data reveal a pronounced positive excursion, the Manitowoc carbon isotope excursion (Manitowoc CIE, ‘Manitowoc Excursion’) spanning the upper Pterospathodus eopennatus Zone and the lower Pterospathodus amorphognathoides amorphognathoides Superzone, with an increase of ca. 2‰ in δ¹³Ccarb and ca. 5‰ in δ¹³Corg. Well-bracketed by conodont biostratigraphy, the Manitowoc CIE is an essential tie-point for correlation between the Baizitian succession and the Telychian strata of Baltica and Laurentia. Our new δ¹³Ccarb and δ¹³Corg data imply that the carbon isotope excursion previously recognized as the ‘Ireviken Excursion’ (Early Sheinwoodian Carbon Isotope Excursion) at Baizitian should be revised as being the Manitowoc CIE. The Δ¹³C data presented in this study further suggest a slight concurrent drop of atmospheric CO2, and thus add evidence for a perturbation of the global carbon cycle during the middle Telychian. Based on the combined information from the conodont apatite oxygen isotope records from Estonia and the significant stratigraphic gaps recognized at the Baizitian section, we propose that the latter stratigraphic gaps should correlate with the Telychian Valgu and the early Sheinwoodian glaciation.

Authors with CRIS profile

Oliver Lehnert Lehrstuhl für Geologie (Exogene Dynamik)

Involved external institutions

Nanjing Institute of Geology and Paleontology

China (CN) Lund University / Lunds universitet

Sweden (SE) Tallinn University of Technology

Estonia (EE)

How to cite

APA:

Yan, G., Lehnert, O., Männik, P., Calner, M., Luan, X., Gong, F.,... Wu, R. (2022). The record of early Silurian climate changes from South China and Baltica based on integrated conodont biostratigraphy and isotope chemostratigraphy. Palaeogeography, Palaeoclimatology, Palaeoecology, 606. https://dx.doi.org/10.1016/j.palaeo.2022.111245

MLA:

Yan, Guanzhou, et al. "The record of early Silurian climate changes from South China and Baltica based on integrated conodont biostratigraphy and isotope chemostratigraphy." Palaeogeography, Palaeoclimatology, Palaeoecology 606 (2022).

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