A petrologic and ion microprobe study of a Vigarano Type B refractory inclusion - Evolution by multiple stages of alteration and melting

Details A petrologic and ion microprobe study of a Vigarano Type B refractory inclusion - Evolution by multiple stages of alteration and melting A petrologic and ion microprobe study of a Vigarano Type B refractory inclusion - Evolution by multiple stages of alteration and melting

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57..231m&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 1, p. 231-243.

Computer Science

46

Aluminum Isotopes, Carbonaceous Chondrites, Feldspars, Ion Probes, Magnesium Isotopes, Metamorphism (Geology), Meteoritic Composition, Petrology, Spinel, Abundance, Akermanite, Melts (Crystal Growth), Mineralogy, Sodium, Meteorites, Stony Meteorites, Chondrites, Cv3 Chondrites, Vigarano, Samples, Meteorite, Petrology, Microprobe Methods, Inclusions, Cais, Refractory Material, Evolution, Melting, Alteration, Composition, Melilite, Description, Laboratory Studies, Mineralogy, Magnesium 26, Anorthite, Isotopes

Scientific paper

A Type B Ca-, Al-rich 6-m-diam inclusion (CAI) found in the Vigarano C3V chondrite was inspected using optical and scanning electron microscopies and ion microprobe analyses. It was found that the primary constituents of the CAI inclusion are (in percent), melilite (52), fassaite, (20), anorthite (18), spinel (10), and trace Fe-Ni metal. It is noted that, while many of the properties of the inclusion indicate solidification from a melt droplet, the Al-26/Mg-26 isotopic systematics and some textural relationships are incompatible with single-stage closed system crystallization of a homogeneous molten droplet, indicating that the history of this inclusion must have been more complex than melt solidification alone. Moreover, there was unusually high content of Na in melilite, suggesting that the droplet did not form by melting of pristine high-temperature nebular condensates.

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