Silicon abundances in meteoritic chondrules

Details Silicon abundances in meteoritic chondrules Silicon abundances in meteoritic chondrules

Oct 1967

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967gecoa..31.1975s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 31, Issue 10, pp.1975-1985

Computer Science

2

Scientific paper

Silicon abundances have been determined in some 275 chondrules (masses ranging from 0.1 to 70 mg) from nineteen different chondrites from most chondritic groups by instrumental, 14-MeV neutron activation analysis, using the nuclear reaction Si 28 (n, p)Al 28 . Average Si abundances at about 20 % in chondrules from Type II carbonaceous chondrites agreed well with a forsterite composition for these chondrules. In general, ca. 25 % more Si is present in chondrules than in the bulk chondrites. Very low Si abundances (0.6 to 2.5 %) have been observed in some Al Rais, Renazzo, and Tennasilm chondrules. This hiatus in Si abundances of 2% and 20% suggests that meteoritic chondrules may have originated from two different sources in the solar nebula or formed from the same nebular source but under changing temperature-pressure conditions.

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