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Fall, recovery and description of the Coleman chondrite
Author(s) -
OSBORN WAYNE,
MATTY DAVID,
VELBEL MICHAEL,
BROWN PETER,
WACKER JOHN
Publication year - 1997
Publication title -
meteoritics and planetary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.09
H-Index - 100
eISSN - 1945-5100
pISSN - 1086-9379
DOI - 10.1111/j.1945-5100.1997.tb01569.x
Subject(s) - meteorite , chondrite , chondrule , geology , carbonaceous chondrite , parent body , electron microprobe , geochemistry , ordinary chondrite , mineralogy , asteroid , astrobiology , physics
— A 0.5 kg stony meteorite associated with a bright bolide seen over southeastern Michigan on 1994 October 20 has been recovered. The circumstances of the fall and recovery of this chondrite, named Coleman, are presented. The most likely trajectory from the observations of the event implies preatmospheric orbital parameters typical of meteorites. Gamma‐ray spectrometry of the cosmogenic radionuclides showed that the recovered mass was an interior fragment of a larger body and revealed abnormally high 22 Na and 26 Al activity. Electron microprobe analysis yielded compositions of Fa 24.1 and Fs 20.3 , which are consistent with an L‐chondrite classification. Petrographically, the presence of chondrules, the observed mineralogy and the degree of chondrule‐matrix integration suggests assignment to petrologic type 6.