globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2017.02.006
论文题名:
An Early Triassic (Smithian) stromatolite associated with giant ooid banks from Lichuan (Hubei Province), South China: Environment and controls on its formation
作者: Fang Y.; Chen Z.-Q.; Kershaw S.; Li Y.; Luo M.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
语种: 英语
英文关键词: Daye Formation ; Ecosystem degradation ; Giant ooid ; Lower Triassic ; Microbial origin ; Stromatolites
英文摘要: Here we report the thickest Early Triassic stromatolite so far recorded, which developed within giant ooid banks in the upper Smithian succession (Lower Triassic) of the Lichuan area, western Hubei Province, South China. Approximately 16. m of stromatolite is embedded within ca. 30-m-thick oolitic limestones that crop out in the upper Daye Formation. The associated conodonts suggest a late Smithian (Early Triassic) age for the stromatolite-ooid complex. Stromatolites exhibit domal, stratified columnar, wavy laminated, cabbage-shaped, roll-up, and conical structures. Stromatolites are overlain by thick oolitic limestone, implying that the demise of the Lichuan stromatolite may be attributed to an environmental change to agitated shallow waters. Four types of microbially-induced microstructures are recognizable in the stromatolites, including diffuse laminated, reticular, intraclastic, and irregular clotted microstructures. Co-occurrence of these microbe-induced microstructures indicates a biogenic origin for the Lichuan stromatolite. The ooids can be categorized into circular, compound, superficial, and irregular types. Some interior layers within ooids exhibit intense fluorescence, indicative of microbial organomineralization, which may have contributed to the formation of the ooids. Moreover, abundant nanometer-scale textures and particles are usually interpreted as microbial involvement during the formation of the dolomite. These nano-textures in both stromatolites and ooids, and authigenic quartz grains commonly preserved in stromatolite can be attributed to abundant organic matter in seawater, resulting from microbial proliferation. The stromatolites described here are evidence of flourishing microbial communities on both eastern and western margins of the Paleo-Tethys Ocean during the middle Early Triassic, suggesting episodic degradation of marine ecosystems after the Permian-Triassic mass extinction. © 2017.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68272
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作者单位: State Key Laboratory of Biogeology and Environmental Geology and School of Earth Science, China University of Geosciences (Wuhan), Wuhan 430074, China; Institute for Environment, Brunel University, Uxbridge UB8 3PH, UK; State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences (Wuhan), Wuhan 430074, China; School of Life and Environmental Sciences, Deakin University, Melbourne Burwood Campus, Victoria 3125, Australia

Recommended Citation:
Fang Y.,Chen Z.-Q.,Kershaw S.,et al. An Early Triassic (Smithian) stromatolite associated with giant ooid banks from Lichuan (Hubei Province), South China: Environment and controls on its formation[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01
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