Timing of recovery from the end-Permian extinction: Geochronologic and biostratigraphic constraints from south China

作者：Lehrmann Daniel J^*; Ramezani Jahandar; Bowring Samuel A; Martin Mark W; Montgomery Paul; Enos Paul; Payne Jonathan L; Orchard Michael J; Wang Hongmei; Wei Jiayong

来源：Geology, 2006, 34(12): 1053-1056.

DOI：10.1130/G22827A.1

• U-Pb geochronology
• conodont
• biostratigraphy
• Permian
• Triassic
• extinction

Four voleanic-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 similar to 5 m.y. This time constraint must be considered in any model for the end-Permian extinction and subsequent recovery.

• 出版日期2006-12