Chondritic Meteorite Fragments Associated with the Permian- Triassic Boundary in Antarctica
Abstract
Multiple chondritic meteorite fragments have been found in two sedimentary rock samples from an end-Permian bed at Graphite Peak in Antarctica. The Ni/Fe, Co/Ni, and P/Fe ratios in metal grains; the Fe/Mg and Mn/Fe ratios in olivine and pyroxene; and the chemistry of Fe-, Ni-, P-, and S-bearing oxide in the meteorite fragments are typical of CM-type chondritic meteorites. In one sample, the meteoritic fragments are accompanied by more abundant discrete metal grains, which are also found in an end-Permian bed at Meishan, southern China. We discuss the implications of this finding for a suggested global impact event at the Permian-Triassic boundary.
- Publication:
-
Science
- Pub Date:
- November 2003
- DOI:
- 10.1126/science.1090852
- Bibcode:
- 2003Sci...302.1388B
- Keywords:
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- GEOCHEM PHYS