Chondritic meteorite fragments associated with the Permian-Triassic boundary in Antarctica.
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.
Basu
Asish R
AR
Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627, USA. abasu@earth.rochester.edu
Petaev
Michail I
MI
Poreda
Robert J
RJ
Jacobsen
Stein B
SB
Becker
Luann
L
D000818:Animals; D000864:Antarctic Regions; D003035:Cobalt / Q000032:analysis; D019015:Geologic Sediments / Q000737:chemistry*; D007501:Iron / Q000032:analysis; D008274:Magnesium / Q000032:analysis; D008280:Magnetics; D008345:Manganese / Q000032:analysis; D008670:Metals / Q000032:analysis; D019110:Meteoroids; D008903:Minerals / Q000032:analysis*; D009532:Nickel / Q000032:analysis; D010087:Oxides / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D010944:Plants; D011156:Population Density; D017640:Silicates / Q000032:analysis; D013440:Sulfides / Q000032:analysis; D013455:Sulfur / Q000032:analysis; D013995:Time
D008670:Metals; D008903:Minerals; D010087:Oxides; D017640:Silicates; D013440:Sulfides; D010758:Phosphorus; D003035:Cobalt; D008345:Manganese; D013455:Sulfur; D009532:Nickel; D007501:Iron; D008274:Magnesium