气候变化领域集成服务门户(CCPortal): Two pulses of extinction of larger benthic foraminifera during the Pliensbachian-Toarcian and early Toarcian environmental crises

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DOI	10.1016/j.palaeo.2020.109998
	Two pulses of extinction of larger benthic foraminifera during the Pliensbachian-Toarcian and early Toarcian environmental crises
	Jiang S.; Song H.; Kemp D.B.; Dai X.; Liu X.
发表日期	2020
ISSN	0031-0182
卷号	560
英文摘要	The early Toarcian (Early Jurassic, ~183 Ma) was characterized by a pronounced oceanic anoxic event (OAE), global warming, major changes in hydrological cycling and a second order mass extinction. Most studies of early Toarcian geobiology have focused on the Northern Hemisphere, and only a few studies have been carried out on strata from the southwestern Tethys Ocean and Southern Hemisphere. This limits our understanding of the geographic extent of the early Toarcian mass extinction (ETME). To address this issue, in this study we have analyzed foraminiferal assemblages from the East Selong and Nianduo sections of South Tibet, China. Our results show that 14 species disappeared during the ETME, accounting for 21.9% (14/64) of overall taxonomic richness. Of these, nine of the victims were larger benthic foraminifera (LBF), accounting for 75% (9/12) of LBF species. We also find that close to the Pliensbachian-Toarcian boundary, six species of foraminifera disappear, and five of these victims were LBF (5/17). Our work thus demonstrates two extinction pulses of LBF in South Tibet, i.e. at the Pliensbachian-Toarcian boundary, and coeval the early Toarcian OAE. The results suggest LBF were more vulnerable to environmental stress than smaller foraminifera, which is consistent with other mass extinctions such as the Permian-Triassic extinction. Our findings confirm that the Southern Hemisphere, like the Northern Hemisphere, was severely affected by environmental changes across the late Pliensbachian to early Toarcian interval, and that extinctions were synchronous with the Northern Hemisphere. © 2020
英文关键词	Biodiversity; Foraminiferal morphogroup; Marine anoxia; Mass extinction; Neo-Tethys; South Tibet
语种	英语
scopus关键词	benthic foraminifera; extinction; fossil assemblage; global warming; mass extinction; Northern Hemisphere; Pliensbachian; Southern Hemisphere; species richness; Tethys; Toarcian; China; Xizang; Foraminifera
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150309
作者单位	State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China
推荐引用方式 GB/T 7714	Jiang S.,Song H.,Kemp D.B.,et al. Two pulses of extinction of larger benthic foraminifera during the Pliensbachian-Toarcian and early Toarcian environmental crises[J],2020,560.
APA	Jiang S.,Song H.,Kemp D.B.,Dai X.,&Liu X..(2020).Two pulses of extinction of larger benthic foraminifera during the Pliensbachian-Toarcian and early Toarcian environmental crises.Palaeogeography, Palaeoclimatology, Palaeoecology,560.
MLA	Jiang S.,et al."Two pulses of extinction of larger benthic foraminifera during the Pliensbachian-Toarcian and early Toarcian environmental crises".Palaeogeography, Palaeoclimatology, Palaeoecology 560(2020).