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Timing of recovery from the end-Permian extinction: geochronologic and biostratigraphic constraints from south China
- Source :
- Geology. Dec, 2006, Vol. 34 Issue 12, p1053, 4 p.
- Publication Year :
- 2006
-
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. Keywords: U-Pb geochronology, conodont, biostratigraphy, Permian, Triassic, extinction.
Details
- Language :
- English
- ISSN :
- 00917613
- Volume :
- 34
- Issue :
- 12
- Database :
- Gale General OneFile
- Journal :
- Geology
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.163394799