Computer Science
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.292..135n&link_type=abstract
Nature, vol. 292, July 9, 1981, p. 135, 136.
Computer Science
74
Chondrule, Meteoritic Composition, Meteoritic Microstructures, Olivine, Petrology, Calcium Oxides, Crystallization, Iron, Magnesium Oxides, Melting, Meteorites, Chondrules, Origin, Condensation, Impacts, Fusion, Olivine, Melting, Antarctic Meteorites, Allan Hills Meteorites, Alha77015, Texture, Photomicrographs, Magnesium Oxide, Calcium Oxide, Samples, Meteorite, Temperatures
Scientific paper
Evidence for the formation of chondrules through processes involving precursory materials rather than by direct condensation from the solar nebula is presented. The characteristics of the olivine contained in porphyritic chondrules from the Antarctic meteorite ALH-77015 are discussed, and it is pointed out that several chondrules contain two types of olivine: a type with numerous dusty inclusions and a dirty appearance which is always found near the center of the chondrules, and a second clear euhedral small grain which is found around the first type. The two types of olivine are also noted to have different chemical compositions and crystal structures, indicating that both types could not have crystallized from a liquid in a single process. The dirty, iron-rich olivine is interpreted as a relic mineral which was originally rich in iron and was not completely melted when heated. The relic olivine is thus concluded to be direct evidence for the formation of chondrules through the melting of pre-existing materials.
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