The age of the Permian-Triassic boundary

Details The age of the Permian-Triassic boundary The age of the Permian-Triassic boundary

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.105..182c&link_type=abstract

Earth and Planetary Science Letters, Volume 105, Issue 1-3, p. 182-190.

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35

Scientific paper

The 5 cm boundary clay bed in the Chinese stratotype section through the Permian-Triassic boundary has been recognised as a bentonite. SHRIMP ion microprobe dating of zircons in the bentonite indicates a magmatic age of 251.2 +/- 3.4 Ma (2σ) this is the first direct constraint on the numerical age of the Permian-Triassic boundary.
Future refinements of ages at this important, but poorly constrained, level of the Phanerozoic timescale may depend on re-analysis of this uniquely placed volcanic horizon, and other bentonites in the fossiliferous Chinese Upper Permian and Lower Triassic. The utility of defining the Permian-Triassic boundary in the Chinese stratotype section, in the vicinity of known dateable horizons, should be considered.

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