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Title:
Timing of recovery from the end-Permian extinction: Geochronologic and biostratigraphic constraints from south China
Authors:
Lehrmann, Daniel J.; Ramezani, Jahandar; Bowring, Samuel A.; Martin, Mark W.; Montgomery, Paul; Enos, Paul; Payne, Jonathan L.; Orchard, Michael J.; Hongmei, Wang; Jiayong, Wei
Publication:
Geology, vol. 34, Issue 12, p.1053
Publication Date:
12/2006
Origin:
ADS
DOI:
10.1130/G22827A.1
Bibliographic Code:
2006Geo....34.1053L

Abstract

Four volcanic-ash beds bracket the Early-Middle Triassic boundary, as defined by conodont biostratigraphy, in a stratigraphic section in south China. High-precision U-Pb dates of single zircons allow us to place the Early to Middle Triassic (Olenekian-Anisian) boundary at 247.2 Ma. Magnetic-reversal stratigraphy allows global correlation. The new dates constrain the Early Triassic interval characterized by delayed biotic recovery and carbon-cycle instability to ˜5 m.y. This time constraint must be considered in any model for the end-Permian extinction and subsequent recovery.
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