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Science in China Series D: Earth Sciences

, Volume 50, Issue 9, pp 1281–1292 | Cite as

An accurately delineated Permian-Triassic Boundary in continental successions

  • Yin HongFu 
  • Yang FengQing 
  • Yu JianXin 
  • Peng YuanQiao 
  • Wang ShangYan 
  • Zhang SuXin 
Article

Abstract

The Permian-Triassic Boundary Stratigraphic Set (PTBST), characteristic of the GSSP section of Meishan and widespread in marine Permian-Triassic Boundary (PTB) sequences of South China, is used to trace and recognize the PTB in a continental sequence at Chahe (Beds 66f–68c). Diversified Permian plant fossils extended to the PTBST, and a few relicts survived above which they are replaced by gymnosperm pollen of Triassic aspect. In the nearby Zhejue Section, the continental PTBST is characterized by the fungal ‘spike’ recorded in many places throughout the world. The boundary claybeds (66f and 68a,c) of the PTBST are composed of mixed illite-montmorillonite layers analogous with those at Meishan. They contain volcanogenic minerals such as β quartz and zircon. U/Pb dating of the upper claybed gives ages of 247.5 and 252.6 Ma for Beds 68a and 68c respectively, averaging 250 Ma. In contrast to the situation in Xinjiang and South Africa, the sediment sequence of the Permian-Triassic transition in the Chahe section (Beds 56–80) become finer upward. Shallowing and coarsening upward is not, therefore, characteristic of the Permian-Triassic transition everywhere. The occurrence of relicts of the Gigantopteris Flora in the Kayitou Fm. indicates that, unlike most marine biota, relicts of this paleophytic flora survived into the earliest Triassic. It is concluded that Bed 67 at Chahe corresponds to Bed 27 at Meishan, and that the PTB should be put within the 60-cm-thick Bed 67b④, now put at its base tentatively. This is the most accurate correlation of the PTB in continental facies with that in the marine GSSP.

Keywords

Permian-Triassic Boundary terrestrial sequence U-Pb age Chahe section accuracy 

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Copyright information

© Science in China Press 2007

Authors and Affiliations

  • Yin HongFu 
    • 1
  • Yang FengQing 
    • 2
  • Yu JianXin 
    • 2
  • Peng YuanQiao 
    • 1
  • Wang ShangYan 
    • 3
  • Zhang SuXin 
    • 1
  1. 1.Laboratory of Biological and Environmental GeologyChina University of GeosciencesWuhanChina
  2. 2.State Key Laboratory of Geological Process and Mineral ResourcesChina University of GeosciencesWuhanChina
  3. 3.Geological Survey of Guizhou ProvinceGuiyangChina

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