Mathematics – Logic
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988rspta.325..445h&link_type=abstract
(Royal Society, Discussion on the Solar System: Chemistry as a Key to its Origin, London, England, July 15, 16, 1987) Royal Soci
Mathematics
Logic
8
Chondrites, Meteoritic Composition, Solar System, Aluminum Compounds, Calcium Compounds, Chondrule, Isotopes, Mineralogy, Nebulae
Scientific paper
Chondritic meteorites have not been involved in planetary melting for the past 4.5 Ga. They contain millimeter-sized subspherical objects, 'chondrules', dominantly of silicate, but occasionally grading to rare, metal-sulphide chondrules. Some meteorites comprise 70 percent or more of chondrules by volume. About 30 percent of chondrules, or less, originated as molten droplets; the remainder formed from solid or plastic rocks. No rock known from the earth or moon contains enough glassy spherules to be termed a chondrite, so volcanism and impact on brittle planetary surfaces were not chondrule-forming mechanisms. Chondrites have chemical compositions close to that of the volatile-free sun, so a nebular origin for chondrules is often favored. However, the mineralogical and chemical diversity among chondrules indicates that some had planetary origins.
Barber David J.
Hutchison Robert
O'D. Alexander Conel M.
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