Transgressive–regressive sequences on the slope of an isolated carbonate platform (Middle–Late Permian, Laibin, South China)

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• 作者：Zhen Qiu (1) (2)
  Qingchen Wang (2)
  Caineng Zou (1)
  Detian Yan (3)
  Hengye Wei (4)
  
• 关键词：Facies ; Transgressive–regressive sequences ; The end ; Guadalupian mass extinction ; Middle to Late Permian ; Laibin ; South China
• 刊名：Facies
• 出版年：2014
• 出版时间：January 2014
• 年：2014
• 卷：60
• 期：1
• 页码：327-345
• 全文大小：2,424 KB
• 作者单位：Zhen Qiu (1) (2)
  Qingchen Wang (2)
  Caineng Zou (1)
  Detian Yan (3)
  Hengye Wei (4)
  
  1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing, 100083, China
  2. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
  3. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, University of Geosciences, Wuhan, 430074, China
  4. College of Earth Science, East China Institute of Technology, Nanchang, 330013, China
  
• ISSN：1612-4820

文摘

From the Middle to Late Permian, the Laibin area in Guangxi, South China, was situated on the slope of an isolated carbonate platform, on which continuous marine successions were deposited. Two global stratotype sections for the boundary between the Guadalupian (Middle Permian) and Lopingian (Late Permian) are located at Penglaitan and Tieqiao in the Laibin area, respectively, and thus are chosen for study. At the two locations, 14 facies are recognized in the Maokou and Heshan Formations, and they are further grouped into four facies associations (basin, lower slope, upper slope, and platform margin). Six main transgressive–regressive (TR) sequences are identified in strata from the Roadian (Middle Permian) to the Wuchiapingian (Late Permian). They are conformable marine sequences that were little influenced by regional uplift (Dongwu Movement) and so provide a good record of the sea-level changes in South China at this time. Based on the significant taxonomic selection and controversial marine faunal loss in the end-Guadalupian mass extinction, and the Middle-Late Permian sea-level changes recorded by the TR sequences in the Laibin area, it is suggested that this extinction event might have been triggered by the reduction and loss of shallow-marine habitat area caused by the end-Guadalupian regression. The global cooling and Emeishan volcanism also occurring at this time could have further enhanced this extinction event.