DOI: 10.1016/j.gloplacha.2016.07.007
论文题名: Sedimentology and ichnology of two Lower Triassic sections in South China: Implications for the biotic recovery following the end-Permian mass extinction
作者: Luo M. ; George A.D. ; Chen Z.-Q.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2016
卷: 144 起始页码: 198
结束页码: 212
语种: 英语
英文关键词: Biotic recovery
; Permian
; South China
; Trace fossils
; Triassic
Scopus关键词: Sedimentology
; Stratigraphy
; Environmental conditions
; Facies analysis
; Marine environment
; Mass extinction
; Permian
; South China
; Trace fossils
; Triassic
; Recovery
; bedding plane
; environmental conditions
; facies analysis
; ichnofabric
; ichnology
; intertidal community
; intertidal environment
; marine environment
; mass extinction
; population decline
; sedimentology
; trace fossil
; Triassic
; China
; Planolites
; Rhizocorallium
; Thalassinoides
英文摘要: Biotic recovery following the end-Permian mass extinction was investigated using trace fossil and facies analysis of two Lower–Middle Triassic sections in South China. The Susong section (Lower Yangtze Sedimentary Province) comprises a range of carbonate and mudstone facies that record overall shallowing from offshore to intertidal settings. The Tianshengqiao section (Upper Yangtze Sedimentary Province) consists of mixed carbonate and siliciclastic facies deposited in shallow marine to offshore settings. Griesbachian to Dienerian ichnological records in both sections are characterized by low ichnodiversity, low ichnofabric indices (1–2) and low bedding plane bioturbation indices (1–2). Higher ichnofabric indices (3 and 4), corresponding to a dense population of diminutive ichnotaxon, in the Tianshengqiao section suggest opportunistic infaunal biotic activity during the earliest Triassic. Ichnological data from the Susong section show an increase in ichnodiversity during the late Smithian with 11 ichnogenera identified and increased ichnofabric indices of 4–5 and bedding plane bioturbation indices of 3–5. Although complex traces such as Rhizocorallium are present in Spathian-aged strata in this section, low ichnodiversity and ichnofabric indices and diminutive Planolites suggest a decline in recovery. In the Tianshengqiao section, ichnofabric indices are moderate to high (3–5) although only six ichnogenera are present and Planolites burrows are consistently small in Smithian and Spathian strata. Complex traces, such as large Rhizocorallium and Thalassinoides, and large Planolites, did not appear until the Anisian. Ichnological results from both sections record the response of organisms to unfavourable environmental conditions although the Susong section shows earlier recovery during the Smithian prior to latest Smithian–Spathian decline. This decline may have resulted from a resurgence of euxinic to anoxic marine environment in various regions of South China. Ichnological data from the Tianshengqiao section indicate protracted recovery throughout the Early Triassic as previously found elsewhere in South China. Comparison of the South China trace fossil records with global ichnological data show a diachronous pattern of recovery of trace makers and highlights the heterogeneous development of oxic facies on the marked variation in recovery rate. © 2016 URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84982797328&doi=10.1016%2fj.gloplacha.2016.07.007&partnerID=40&md5=a173da8a730e6bbede8065528907132f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11645
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: School of Earth and Environment, University of Western AustraliaWestern Australia, Australia
Recommended Citation:
Luo M.,George A.D.,Chen Z.-Q.. Sedimentology and ichnology of two Lower Triassic sections in South China: Implications for the biotic recovery following the end-Permian mass extinction[J]. Global and Planetary Change,2016-01-01,144.