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Conodont succession and reassessment of major events around the PermianTriassic boundary at the Selong Xishan section, southern Tibet, China
Dong-Xun Yuan (袁东勋); Yi-Chun Zhang (张以春); Shu-Zhong Shen (沈树忠)
2018-02-01
Source PublicationGlobal and Planetary Change
ISSN0921-8181
Volume161Pages:194-210
Abstract

A major discrepancy for the age of the Selong Group from middle Cisuralian (Early Permian) to Changhsingian resulted from previous reports of Sakmarian, Kungurian and Guadalupian (Middle Permian) conodonts and Lopingian (Late Permian) brachiopods. Recently, Cisuralian and Guadalupian conodonts were reported again from the Selong Group and the basal part of the Kangshare Formation at the Selong section, but the age discrepancy remains. We present our conodont materials based on large samples collected from the Selong Group and our interpretation based on identifications using a sample population approach. Three conodont zones are recognized in our re-investigation of the upper part of the Selong Group. They include the Vjalovognathus sp., the Mesogondolella hendersoni, and the M. sheni zones, in ascending order. These zones are overlain by the basal Triassic Hindeodus parvus Zone and the Otoceras woodwardi Zone. Our reassessment of conodonts reported by previous studies from Selong and nearby sections suggest that all specimens consistently point to a Lopingian age; the upper part of the Selong Group is latest Changhsingian in age based on the presence of Clarkina orchardi and Mesogondolella sheni. Previously reported early Cisuralian and Guadalupian conodonts are misidentified using a form species concept. A hiatus may be present at the erosional surface between the Selong Group and the Waagenites Bed of the basal part of the Kangshare Formation. However, the hiatus is minimal because conodont and brachiopod assemblages above and below this surface are very similar, and it results from a latest Changhsingian transgression just before the extinction that follows a global latest Changhsingian regression. There is a distinct rapid end-Permian mass extinction at Selong within the Waagenites Bed, as indicated by the disappearances of all benthic brachiopods, rugose corals and Permian bryozoans. The burst of Clarkina species in the Waagenites Bed and throughout the entire Lower Triassic at Selong is interpreted as a southward migration of equatorial conodont animals associated with the rapid global warming beginning at the end of the Permian. The cool- or cold-water species of Mesogondolella, in the upper part of the Selong Group and the basal part of the Kangshare Formation, are representative of the uppermost Permian in the bipolar/bi-temperate cold-water province and are not reworked from the underlying Selong Group or any other unknown Cisuralian or Guadalupian deposits.

KeywordTibet Selong Conodonts Permian-triassic Boundary End-permian Extinction
DOI10.1016/j.gloplacha.2017.12.024
Indexed BySCI
Language英语
WOS KeywordGlobal Stratotype Section ; Mass Extinction ; Xizang Tibet ; Point Gssp ; Stratigraphy ; Brachiopods ; Evolution ; Biostratigraphy ; Zonation ; Region
WOS Research AreaPhysical Geography
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000424854000016
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/13917
Collection中国科学院南京地质古生物研究所
Corresponding AuthorShu-Zhong Shen (沈树忠)
AffiliationChinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, 39 East Beijing Rd, Nanjing 210008, Peoples R China
First Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Corresponding Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Recommended Citation
GB/T 7714
Dong-Xun Yuan ,Yi-Chun Zhang ,Shu-Zhong Shen . Conodont succession and reassessment of major events around the PermianTriassic boundary at the Selong Xishan section, southern Tibet, China[J]. Global and Planetary Change,2018,161:194-210.
APA Dong-Xun Yuan ,Yi-Chun Zhang ,&Shu-Zhong Shen .(2018).Conodont succession and reassessment of major events around the PermianTriassic boundary at the Selong Xishan section, southern Tibet, China.Global and Planetary Change,161,194-210.
MLA Dong-Xun Yuan ,et al."Conodont succession and reassessment of major events around the PermianTriassic boundary at the Selong Xishan section, southern Tibet, China".Global and Planetary Change 161(2018):194-210.
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