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High-resolution terrestrial permian-triassic eventostratigraphic boundary in western Guizhou and eastern Yunnan, southwestern China
journal contribution
posted on 2005-01-06, 00:00 authored by Yuanqiao Peng, S Zhang, T Yu, F Yang, Yongqun Gao, Guang ShiGuang ShiThe adjoining area of western Guizhou and eastern Yunnan Provinces in southwest China is an ideal place to investigate the feasibility of correlating marine and nonmarine Permian–Triassic boundary (PTB) sequences, as it contains outcrop sections of shallow marine, marginal marine (or paralic), and terrestrial PTB sections, all in close geographic proximity. This paper documents for the first time multiple stratigraphic data from several well-preserved terrestrial PTB sections in the area and attempts to use these data to define, locate, and correlate the PTB in the area. A study of the spores and pollen and vegetation types across the terrestrial PTB sections in the study area suggests three distinct evolutionary stages across the boundary: Stage 1 (Xuanwei Formation) is characterised by Late Permian or Paleozoic-type ferns and pteridosperms (85.0%), with a few gymnosperms (15.0%); stage 2 is marked by an abrupt drop of sporopollen elements of Late Permian aspects, coupled with the appearance of fungal spores and limited Early Triassic palynomorphs; stage 3 (top Xuanwei Formation and Kayitou Formation) is dominated by gymnosperm pollen (58.8%) of clearly Early Triassic aspect, although still retaining limited ferns and pteridosperms. The three biotic stages seem to well correspond with the changing trend of the δ13Corg curves from the same sections, which is characterized by a sharp drop just before the PTB, followed by a short term partial recovery across the boundary, and then succeeded by a gradual decline after the PTB in the Early Triassic. Combining evidence from eventostratigraphic (i.e., the succession of boundary clay beds), biostratigraphic (using both macroplants and palynomorphs), and chemostratigraphic (i.e., organic carbon isotope excursion signals), we propose that a high-resolution PTB succession, closely correlatable to its marine counterpart at the Meishan section in eastern China, is recognisable at the terrestrial PTB sections in the western Guizhou–eastern Yunnan area in southwest China.
History
Journal
Palaeogeography, palaeoclimatology, palaeoecologyVolume
215Issue
3-4Pagination
285 - 295Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0031-0182eISSN
1872-616XLanguage
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2004, Elsevier B.V.Usage metrics
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Keywords
Terrestrial Permian Triassic boundarybiostratigraphyeventostratigraphychemostratigraphySouthwestern ChinaScience & TechnologyPhysical SciencesLife Sciences & BiomedicineGeography, PhysicalGeosciences, MultidisciplinaryPaleontologyPhysical GeographyGeologySOUTH-AFRICAMASS EXTINCTIONCARBON-ISOTOPEFUNGAL EVENTKAROO BASINCOLLAPSESECTIONPATTERNMARINECRISISEvolutionary BiologyGeologyEcology
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