DOI: 10.1016/j.gloplacha.2011.09.009
论文题名: Paleoceanographic conditions following the end-Permian mass extinction recorded by giant ooids (Moyang, South China)
作者: Li F. ; Yan J. ; Algeo T. ; Wu X.
刊名: Global and Planetary Change
ISSN: 0921-8295
出版年: 2013
卷: 105 起始页码: 102
结束页码: 120
语种: 英语
英文关键词: Anachronistic facies
; Carbonate fluorapatite (CFA)
; Early Triassic
; Giant ooids
; South China
Scopus关键词: Anachronistic facies
; Fluorapatites
; Giant ooids
; South China
; Triassic
; Calcium carbonate
; Carbon dioxide
; Crystalline materials
; Crystallography
; Isotopes
; Lasers
; Mineralogy
; Minerals
; Scanning electron microscopy
; Sedimentology
; Carbonation
; environmental conditions
; fluorapatite
; isotopic analysis
; marine environment
; mass extinction
; metazoan
; mineralogy
; ooid
; paleoceanography
; Permian
; petrography
; precipitation (chemistry)
; seafloor
; spatiotemporal analysis
; Triassic
; China
; Guizhou
; Animalia
; Metazoa
英文摘要: Early Triassic oceans were characterized by deposition of a number of "anachronistic facies", including microbialites, seafloor carbonate cement fans, and giant ooids. Giant ooids were particularly prevalent in Lower Triassic sections across South China and exhibit unusual features that may provide insights into marine environmental conditions following the end-Permian mass extinction. The section at Moyang (Guizhou Province) contains abundant giant ooids ranging in size between 2 and 6mm (maximum 12mm) and exhibiting various cortical structures, including regular, deformed, compound, regenerated and "domed". Preservation of ooid cortical structure is generally good as indicated by petrographic observations, and trace element and carbon isotope analyses suggest that diagenesis occurred in a closed diagenetic system. All ooids exhibit fine concentric laminae, frequently alternating between light-colored coarsely crystalline and dark-colored finely crystalline layers probably reflecting variation in organic content or original mineralogy. Under scanning electron microscope, biomineralized filaments or biofilms and tiny carbonate fluorapatite (CFA) crystals are commonly found in the finely crystalline layers. We infer that the precipitation of CFA was related to adsorption of P via microbial activity on the surfaces of ooids following episodic incursions of deep waters rich in CO2, H2S and phosphate into shallow-marine environments. Giant ooid precipitation may have been promoted in shallow ramp settings during these events by increased watermass agitation and supersaturation with respect to CaCO3, as well as reduced carbonate removal rates through biotic skeletal formation. Spatio-temporal distribution data reveal that giant ooids were widespread in the Tethyan region during the Early Triassic, and that they were most abundant immediately after the end-Permian crisis and disappeared gradually as metazoans repopulated marine environments. © 2011 Elsevier B.V.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876966914&doi=10.1016%2fj.gloplacha.2011.09.009&partnerID=40&md5=2c172d55fdf7a4d8cdde577bf9317df8
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11201
Appears in Collections: 全球变化的国际研究计划
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作者单位: State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
Recommended Citation:
Li F.,Yan J.,Algeo T.,et al. Paleoceanographic conditions following the end-Permian mass extinction recorded by giant ooids (Moyang, South China)[J]. Global and Planetary Change,2013-01-01,105.