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CLASSIFICATION OF THE ALLAN HILLS A77307 METEORITE
Author(s) -
Sears D.W.G.,
Ross M.
Publication year - 1983
Publication title -
meteoritics
Language(s) - English
Resource type - Journals
eISSN - 1945-5100
pISSN - 0026-1114
DOI - 10.1111/j.1945-5100.1983.tb00570.x
Subject(s) - chondrite , meteorite , geology , parent body , geochemistry , carbonaceous chondrite , ordinary chondrite , astrobiology , mineralogy , physics
The Allan Hills A77307 meteorite has variously been described as a CO, CV, and a unique CO‐CM related chondrite. We have found that its thermolum‐inescence properties are very different from the established members of the CO chondrite class; it has a TL peak at 170 and a suggestion of a peak at 250°C, while CO chondrites have peaks at 91 ± 7 and 203 ± 11°C. Either the meteorite has suffered some form of alteration or it is not a normal CO chondrite. The latter is consistent with petrologic and compositional data which we interpret to indicate that although Allan Hills A77307 is related to CO chondrites it is not a normal member of that group.