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Title: Current perspectives on the Permian-Triassic boundary and end-Permian mass extinction: Preface
Contributor(s): Metcalfe, Ian  (author); Isozaki, Yukio (author)
Publication Date: 2009
DOI: 10.1016/j.jseaes.2009.07.009
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Abstract: The end-Permian mass extinction is now robustly dated at 252.6 ± 0.2 Ma (U–Pb) and the Permian–Triassic (P–T) GSSP level is dated by interpolation at 252.5 Ma. An isotopic geochronological timescale for the Late Permian–Early Triassic, based on recent accurate high-precision U–Pb single zircon dating of volcanic ashes, together with calibrated conodont zonation schemes, is presented. The duration of the Early Triassic (Induan + Olenekian stages) is estimated at only 5.5 million years. The duration of the Induan Stage (Griesbachian + Dienerian sub-stages) is estimated at ca. one million years and the early Olenekian (Smithian sub-stage) at 0.7 million years duration. Considering this timescale, the "delayed" recovery following the end-Permian mass extinction may not in fact have been particularly protracted, in the light of the severity of the extinction. Conodonts evolved rapidly in the first 1 million years following the mass extinction leading to recognition of high-resolution conodont zones. Continued episodic global environmental and climatic stress following the extinction is recognized by multiple carbon isotope excursions, further faunal turnover and peculiar sedimentary and biotic facies (e.g. microbialites). The end-Permian mass extinction is interpreted to be synchronous globally and between marine and non-marine environments. The nature of the double-phased Late Permian extinction (at the Guadalupian–Lopingian boundary and the P–T boundary), linked to large igneous provinces, suggests a primary role for superplume activity that involved geomagnetic polarity change and massive volcanism.
Publication Type: Journal Article
Source of Publication: Journal of Asian Earth Sciences, 36(6), p. 407-412
Publisher: Elsevier Science
Place of Publication: Oxford, United Kingdom
ISSN: 1367-9120
Field of Research (FOR): 050101 Ecological Impacts of Climate Change
040308 Palaeontology (incl Palynology)
040311 Stratigraphy (incl Biostratigraphy and Sequence Stratigraphy)
Socio-Economic Objective (SEO): 960305 Ecosystem Adaptation to Climate Change
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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