Mathematics – Logic
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29q.551w&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 551
Mathematics
Logic
Carbon Isotopes, Chemical Composition, Chondrites, Meteoritic Composition, Weathering, Metamorphism (Geology), Meteoroid Showers, Petrography, Thermoluminescence
Scientific paper
The unequilibrated ordinary chondrites are an important group of primitive meteorites that show a well-defined metamorphic sequence distinguishable petrographically, chemically, and by thermoluminescence. The lower petrologic types are known to contain interstellar grains and D-rich components. Ordinary chondrites comprise about 6.7% of all observed meteorite falls. In contrast, they constitute 8.2% of the classified EUROMET collection and 13.3% of specimens collected in the Acfer region of the Sahara. Although this discrepancy could be influenced by problems associated with pairing, it seems appropriate to study further these apparent differences in distribution. One way in which this can be attempted is through a study of the C contents and stable isotopic compositions of the meteorites. Results from previous studies have shown that type 3 ordinary chondrites exhibit a wide spread of C contents and delta(C-13) values. Some of these variations can be attributed to contamination and/or the effects of weathering, but differences in the indigenous components also play a part. Distinguishing contamination in ordinary chondrites is vital if the role of metamorphism in determining their overall carbon chemistry and the effects that this process exerts on interstellar components is to be fully understood. The results obtained thus far are quite intriguing. Considering just the L-group chondrites, the majority of the samples analyzed have C contents and isotopic compositions that are similar to the falls. Two samples (Acfer 102 and 133) have relatively high levels of C with low delta(C-13) values. If this C is indigenous to the samples, then clearly it deserves further study.
Bland Phil
Franchi Ian A.
Pillinger Colin T.
Wight M. J.
Wright Ian P.
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