The D/H ratios of round phyllosilicate and glass spherules in the AL Rais (CR) chondrite

Details The D/H ratios of round phyllosilicate and glass spherules in the AL Rais (CR) chondrite The D/H ratios of round phyllosilicate and glass spherules in the AL Rais (CR) chondrite

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..487g&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 485.

Mathematics

Logic

4

Meteoritic Composition, Chondrites, Isotopic Enrichment, Silicates, Hydrogen, Deuterium, Glass, Spherules, Ion Probes, Transmission Electron Microscopy, Minerals

Scientific paper

It is well known that many primitive meteorites and interplanetary dust particles exhibit large D enrichments relative to terrestrial material. Phyllosilicates found in CR meteorites provide one of the best candidates for direct survey of the D/H ratios of water in meteorites. A previous study by Zolensky et al. (1996) demonstrated that the yellow and brown spherules noted in CR chondrites are noncrystalline material (glass), phyllosilicates, or a mixture of both. These spherules, generally smaller than one mm, are found within and rimming chondrules, and scattered loosely within the matrix. They are particularly abundant in Al Rais. Six of these spherules (less than 100 microns) were selected from Al Rais and pressed into a gold foil for D/H measurement with an ion microprobe. After the isotopic analysis, the unsputtered parts of these samples were removed from the gold foil and examined by TEM for their mineralogical characteristics. The results are listed and discussed.

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