Major element chemical compositions and chemical types of chondrules in unequilibrated E, O, and C chondrites from Antarctica

Details Major element chemical compositions and chemical types of chondrules in unequilibrated E, O, and C chondrites from Antarctica Major element chemical compositions and chemical types of chondrules in unequilibrated E, O, and C chondrites from Antarctica

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983polre..30..122i&link_type=abstract

(National Institute of Polar Research, Symposium on Antarctic Meteorites, 8th, Tokyo, Japan, Feb. 17-19, 1983) National Institut

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3

Chemical Elements, Chondrites, Chondrule, Meteoritic Composition, Antarctic Regions, Iron, Nickel, Olivine, Troilite

Scientific paper

The major element chemical compositions of most chondrules correspond to the compositions of mixtures of olivine and low-Ca pyroxene with constant amounts of feldspar (or feldspathoid) and high-Ca pyroxene; other chondrules contain variable amounts of normative feldspar (or feldspathoid), high-Ca pyroxene, spinel, SiO2-minerals, etc. The Al, Na, and K contents of most chondrules reflect the composition of the ternary feldspar (An-Ab-Kf) of the chondrule precursor material, and chemical types of chondrules (KF, SP, IP, CP) are defined on the basis of the proportions of Al, Na, and K. The KF chondrule type is restricted to brecciated LL chondrites. The CP type is rare, and occurs mainly in carbonaceous chondrites.The SP and IP types are most abundant in all chondrites; the relative frequency of SP and IP types difers among brecciated LL type chondrites, ordinary chondrites (except for the brecciated LL type), and carbonaceous chondrites.

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