Different triggers for the two pulses of mass extinction across the Permian and Triassic boundary

Abstract Widespread ocean anoxia has been proposed to cause biotic mass extinction across the Permian–Triassic (P–Tr) boundary. However, its temporal dynamics during this crisis period are unclear. The Liangfengya section in the South China Block contains continuous marine sedimentary and fossil rec...

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Autores principales:	Guoshan Li, Wei Liao, Sheng Li, Yongbiao Wang, Zhongping Lai
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6d51662adb7d43aa831ca6e695d87894
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spelling	oai:doaj.org-article:6d51662adb7d43aa831ca6e695d878942021-12-02T11:45:03ZDifferent triggers for the two pulses of mass extinction across the Permian and Triassic boundary10.1038/s41598-021-86111-72045-2322https://doaj.org/article/6d51662adb7d43aa831ca6e695d878942021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86111-7https://doaj.org/toc/2045-2322Abstract Widespread ocean anoxia has been proposed to cause biotic mass extinction across the Permian–Triassic (P–Tr) boundary. However, its temporal dynamics during this crisis period are unclear. The Liangfengya section in the South China Block contains continuous marine sedimentary and fossil records. Two pulses of biotic extinction and two mass extinction horizons (MEH 1 & 2) near the P–Tr boundary were identified and defined based on lithology and fossils from the section. The data showed that the two pulses of extinction have different environmental triggers. The first pulse occurred during the latest Permian, characterized by disappearance of algae, large foraminifers, and fusulinids. Approaching the MEH 1, multiple layers of volcanic clay and yellowish micritic limestone occurred, suggesting intense volcanic eruptions and terrigenous influx. The second pulse occurred in the earliest Triassic, characterized by opportunist-dominated communities of low diversity and high abundance, and resulted in a structural marine ecosystem change. The oxygen deficiency inferred by pyrite framboid data is associated with biotic declines above the MEH 2, suggesting that the anoxia plays an important role.Guoshan LiWei LiaoSheng LiYongbiao WangZhongping LaiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Guoshan Li Wei Liao Sheng Li Yongbiao Wang Zhongping Lai Different triggers for the two pulses of mass extinction across the Permian and Triassic boundary
description	Abstract Widespread ocean anoxia has been proposed to cause biotic mass extinction across the Permian–Triassic (P–Tr) boundary. However, its temporal dynamics during this crisis period are unclear. The Liangfengya section in the South China Block contains continuous marine sedimentary and fossil records. Two pulses of biotic extinction and two mass extinction horizons (MEH 1 & 2) near the P–Tr boundary were identified and defined based on lithology and fossils from the section. The data showed that the two pulses of extinction have different environmental triggers. The first pulse occurred during the latest Permian, characterized by disappearance of algae, large foraminifers, and fusulinids. Approaching the MEH 1, multiple layers of volcanic clay and yellowish micritic limestone occurred, suggesting intense volcanic eruptions and terrigenous influx. The second pulse occurred in the earliest Triassic, characterized by opportunist-dominated communities of low diversity and high abundance, and resulted in a structural marine ecosystem change. The oxygen deficiency inferred by pyrite framboid data is associated with biotic declines above the MEH 2, suggesting that the anoxia plays an important role.
format	article
author	Guoshan Li Wei Liao Sheng Li Yongbiao Wang Zhongping Lai
author_facet	Guoshan Li Wei Liao Sheng Li Yongbiao Wang Zhongping Lai
author_sort	Guoshan Li
title	Different triggers for the two pulses of mass extinction across the Permian and Triassic boundary
title_short	Different triggers for the two pulses of mass extinction across the Permian and Triassic boundary
title_full	Different triggers for the two pulses of mass extinction across the Permian and Triassic boundary
title_fullStr	Different triggers for the two pulses of mass extinction across the Permian and Triassic boundary
title_full_unstemmed	Different triggers for the two pulses of mass extinction across the Permian and Triassic boundary
title_sort	different triggers for the two pulses of mass extinction across the permian and triassic boundary
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6d51662adb7d43aa831ca6e695d87894
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_version_	1718395285885943808

Different triggers for the two pulses of mass extinction across the Permian and Triassic boundary

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