Palynological dynamics in the late Permian and the Permian-Triassic transition in southwestern China

doi:10.1016/j.palaeo.2023.111540

NIGPAS OpenIR

	Palynological dynamics in the late Permian and the Permian-Triassic transition in southwestern China
通讯作者	Shao, Longyi(ShaoL@cumtb.edu.cn) ; Ji, Xingkai(xkji@nigpas.ac.cn)
	Shao, Longyi 1; Hua, Fanghui 1; Wang, Juan 1,2; Ji, Xingkai 3; Yan, Zhiming 1,4; Zhang, Tianchang 1; Wang, Xuetian 1; Ma, Shimin 1; Jones, Tim 5; Lu, Huinan 3
	2023-06-01
发表期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
卷号	619 页码:15
摘要	The Permian-Triassic mass extinction (PTME) is regarded as the largest biotic crisis of the Phanerozoic. However, the influence of the terrestrial ecological disturbance on plants remains controversial. Here we study the late Permian to the Early Triassic palynological successions from three borehole sections drilled through the entire Lopingian (the late Permian) and the Permian-Triassic transitional strata in southwestern China. Analyses of palynomorph composition and relative abundance allow us to identify four distinct palynofloral assemblages, which include, in ascending order, the Tripartites cristatus var. minor - Torispora laevigata (ML) assemblage, the Crassispora orientalis - Anticapipollis tornatilis (OT) assemblage, the Lundbladispora communis - Aratrisporites yunnanensis (CY) assemblage, and the Pteruchipollenites reticorpus - Protopinus fuyuanensis (RF) assemblage. These palynological assemblages, together with recently updated age data, further improve our understanding of vegetation dynamics around the PTME. The ML and OT assemblages from the Xuanwei Formation are dominated by gigantopteris and fern peat-forming rainforest and reflect warm and humid paleoclimate conditions preceding the PTME. At the bottom of the overlying Kayitou Formation, the abrupt replacement of the diverse sporomorph assemblage by the assemblage containing herbaceous communities reveals a dramatic floral disruption. The CY assemblage from the bottom part of the Kayitou Formation marks the destruction of Gigantopteris peat-forming ecosystems, and only a few species of Gigantopteris were retained in this assemblage. Subsequently, in the Kayitou Formation notable quantities of gymnosperm pollen dominate the RF assemblage. Many gymnosperms from the RF assemblage were present in the older assemblages in low abundances but they persisted through the ecological disturbance interval and rebounded in the early Triassic RF assemblage. The drought-tolerant plants growing in uplands were likely the first batch of plants to adapt and recover after the extinction event. In the upper part of the Kayitou Formation and the overlying Dongchuan Formation, spore and pollen fossils are absent, which may suggest the collapse of the local terrestrial ecosystem and may also indicate unsuitable conditions for microfossil preservation. We conclude that the PTME caused a sharp decrease in plant species and changes in vegetation-community compositions, but it did not immediately eradicate the terrestrial ecosystem in southwestern China. More drought-tolerant plants persisted beyond the first stage of the terrestrial crisis, but with gradual environmental degradation, terrestrial vegetation eventually collapsed in the Early Triassic. This observation supports the hypothesis that the extinction process of terrestrial vegetation was a two-staged and longer-duration event in southwestern China.
关键词	Terrestrial Permian -Triassic boundary Palynological profiles Mass extinction Southwestern China
DOI	10.1016/j.palaeo.2023.111540
收录类别	SCI
语种	英语
关键词[WOS]	ATMOSPHERIC OXYGEN LEVELS ; LAND-PLANT DIVERSITY ; MASS EXTINCTION ; EASTERN YUNNAN ; SOUTH CHINA ; SIBERIAN TRAPS ; BOUNDARY ; SECTIONS ; RECOVERY ; FIRES
资助项目	National Natural Science Foundation of China[41572090] ; Fundamental Research Funds for the Central Universities ; Yueqi Scholar fund of China University of Mining and Technology (Beijing)
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:001042740200001
项目资助者	National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Yueqi Scholar fund of China University of Mining and Technology (Beijing)
出版者	ELSEVIER
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/42633
专题	中国科学院南京地质古生物研究所
通讯作者	Shao, Longyi; Ji, Xingkai
作者单位	1.China Univ Min & Technol Beijing, Coll Geosci & Surveying Engn, Beijing 100083, Peoples R China 2.Henan Polytech Univ, Sch Resources & Environm, Jiaozuo 454003, Henan, Peoples R China 3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China 4.Weifang Univ, Inst Architectural Engn, Weifang 261061, Shandong, Peoples R China 5.Cardiff Univ, Sch Earth & Environm Sci, Cardiff CF10 3YE, Wales
通讯作者单位	中国科学院南京地质古生物研究所
推荐引用方式 GB/T 7714	Shao, Longyi,Hua, Fanghui,Wang, Juan,et al. Palynological dynamics in the late Permian and the Permian-Triassic transition in southwestern China[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2023,619:15.
APA	Shao, Longyi.,Hua, Fanghui.,Wang, Juan.,Ji, Xingkai.,Yan, Zhiming.,...&Lu, Huinan.(2023).Palynological dynamics in the late Permian and the Permian-Triassic transition in southwestern China.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,619,15.
MLA	Shao, Longyi,et al."Palynological dynamics in the late Permian and the Permian-Triassic transition in southwestern China".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 619(2023):15.