An extremely brief end Ordovician mass extinction linked to abrupt onset of glaciation

Ming Xing Ling; Ren Bin Zhan; Guang Xu Wang; Yi Wang; Yuri Amelin; Peng Tang; Jian Bo Liu; Jisuo Jin; Bing Huang; Rong Chang Wu; Shuo Xue; Bin Fu; Vickie C. Bennett; Xin Wei; Xiao Cong Luan; Seth Finnegan; David A.T. Harper; Jia Yu Rong

doi:10.1016/j.sesci.2019.11.001

An extremely brief end Ordovician mass extinction linked to abrupt onset of glaciation

Ming Xing Ling^*, Ren Bin Zhan, Guang Xu Wang, Yi Wang, Yuri Amelin, Peng Tang, Jian Bo Liu, Jisuo Jin, Bing Huang, Rong Chang Wu, Shuo Xue, Bin Fu, Vickie C. Bennett, Xin Wei, Xiao Cong Luan, Seth Finnegan, David A.T. Harper, Jia Yu Rong

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

The end Ordovician mass extinction (EOME) was the second most severe biotic crisis in Phanerozoic, and has been widely linked to a major glaciation. However, robust geochronology of this interval is still lacking. Here we present four successive high-precision zircon U–Pb dates by isotope dilution thermal ionization mass spectrometry (ID-TIMS) for biostratigraphically well-constrained K-bentonites of a continuous Ordovician-Silurian boundary section at Wanhe, SW China. They include 444.65 ± 0.22 Ma (middle Dicellograptus complexus Biozone), 444.06 ± 0.20 Ma (lower Paraorthograptus pacificus Biozone), 443.81 ± 0.24 Ma (upper Tangyagraptus typicus Subzone), and 442.99 ± 0.17 Ma (upper Metabolograptus extraordinarius Biozone). Calculations based on sedimentation rates suggest a duration of 0.47 ± 0.34 Ma for the Hirnantian Stage, which is much shorter than previously thought (1.4 ± 2.05 Ma in the International Chronostratigraphic Chart ver. 2019/05). The new data also constrain the Hirnantian glacial maximum to ∼0.2 Ma, supporting that its brevity and intensity probably triggered the EOME.

Original language	English
Pages (from-to)	190-198
Number of pages	9
Journal	Solid Earth Sciences
Volume	4
Issue number	4
DOIs	https://doi.org/10.1016/j.sesci.2019.11.001
Publication status	Published - Dec 2019

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Ling, M. X., Zhan, R. B., Wang, G. X., Wang, Y., Amelin, Y., Tang, P., Liu, J. B., Jin, J., Huang, B., Wu, R. C., Xue, S., Fu, B., Bennett, V. C., Wei, X., Luan, X. C., Finnegan, S., Harper, D. A. T., & Rong, J. Y. (2019). An extremely brief end Ordovician mass extinction linked to abrupt onset of glaciation. Solid Earth Sciences, 4(4), 190-198. https://doi.org/10.1016/j.sesci.2019.11.001

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abstract = "The end Ordovician mass extinction (EOME) was the second most severe biotic crisis in Phanerozoic, and has been widely linked to a major glaciation. However, robust geochronology of this interval is still lacking. Here we present four successive high-precision zircon U–Pb dates by isotope dilution thermal ionization mass spectrometry (ID-TIMS) for biostratigraphically well-constrained K-bentonites of a continuous Ordovician-Silurian boundary section at Wanhe, SW China. They include 444.65 ± 0.22 Ma (middle Dicellograptus complexus Biozone), 444.06 ± 0.20 Ma (lower Paraorthograptus pacificus Biozone), 443.81 ± 0.24 Ma (upper Tangyagraptus typicus Subzone), and 442.99 ± 0.17 Ma (upper Metabolograptus extraordinarius Biozone). Calculations based on sedimentation rates suggest a duration of 0.47 ± 0.34 Ma for the Hirnantian Stage, which is much shorter than previously thought (1.4 ± 2.05 Ma in the International Chronostratigraphic Chart ver. 2019/05). The new data also constrain the Hirnantian glacial maximum to ∼0.2 Ma, supporting that its brevity and intensity probably triggered the EOME.",

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AU - Tang, Peng

AU - Liu, Jian Bo

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AU - Huang, Bing

AU - Wu, Rong Chang

AU - Xue, Shuo

AU - Fu, Bin

AU - Bennett, Vickie C.

AU - Wei, Xin

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AU - Finnegan, Seth

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AB - The end Ordovician mass extinction (EOME) was the second most severe biotic crisis in Phanerozoic, and has been widely linked to a major glaciation. However, robust geochronology of this interval is still lacking. Here we present four successive high-precision zircon U–Pb dates by isotope dilution thermal ionization mass spectrometry (ID-TIMS) for biostratigraphically well-constrained K-bentonites of a continuous Ordovician-Silurian boundary section at Wanhe, SW China. They include 444.65 ± 0.22 Ma (middle Dicellograptus complexus Biozone), 444.06 ± 0.20 Ma (lower Paraorthograptus pacificus Biozone), 443.81 ± 0.24 Ma (upper Tangyagraptus typicus Subzone), and 442.99 ± 0.17 Ma (upper Metabolograptus extraordinarius Biozone). Calculations based on sedimentation rates suggest a duration of 0.47 ± 0.34 Ma for the Hirnantian Stage, which is much shorter than previously thought (1.4 ± 2.05 Ma in the International Chronostratigraphic Chart ver. 2019/05). The new data also constrain the Hirnantian glacial maximum to ∼0.2 Ma, supporting that its brevity and intensity probably triggered the EOME.

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An extremely brief end Ordovician mass extinction linked to abrupt onset of glaciation

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