A classification of meteorites based on oxygen isotopes |
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| Authors: | Robert N Clayton Naoki Onuma Toshiko K Mayeda |
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| Institution: | 1. Enrico Fermi Institute, Chicago, Ill USA;2. Departments of Chemistry and Geophysical Sciences, University of Chicago, Chicago, Ill. USA;3. Enrico Fermi Institute,USA;4. University of Chicago, Chicago, Ill. USA |
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| Abstract: | On the basis of18O/16O and17O/16O ratios, meteorites and planets can be grouped into at least six categories, as follows: (1) the terrestrial group, consisting of the earth, moon, differentiated meteorites and enstatite chondrites; (2) types L and LL ordinary chondrites; (3) type H ordinary chondrites; (4) anhydrous minerals of C2, C3, C4 carbonaceous chondrites; (5) hydrous matrix minerals of C2 carbonaceous chondrites; (6) the ureilites. Objects of one category cannot be derived by fractionation or differentiation from the source materials of any other category. |
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