Other
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..89....1b&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 89, no. 1, June 1988, p. 1-14.
Other
20
Aluminum Compounds, Calcium Compounds, Carbonaceous Chondrites, Meteoritic Composition, Chondrule, Metal Oxides, Minerals, Silicon Dioxide, Solar Corona
Scientific paper
The origin of type C inclusions found in carbonaceous chondrites and the relationship of the type C inclusions to other Ca- and Al-rich chondrules are discussed on the basis of major-element composition of these objects. The results on bulk composition analysis of primary phase assemblages in eight Allende-type inclusions and an Allende glass-spinel inclusion were found to be consistent with the following scenario: (1) the condensation of melilite + spinel + perovskite +/- hibonite +/- CaAl4O7; (2) the reaction of melilite + spinel with SiO2(g); (3) the removal of inclusions from further interaction with the reacting gas; (4) melting with little or no volatilization; (5) crystallization; (6) alteration; and (7) incorporation of inclusions into host meteorite. Type C inclusions are considered to be precursors to Al-rich chondrules in ordinary and enstatite chondrites, i.e., they are considered to be a spinel-rich class of type A that reacted with silica from a coexisting gas to produce anorthite plus diopside.
Beckett John R.
Grossman Lawrence
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