A refractory inclusion in the Kaba CV3 chondrite - Some implications for the origin of spinel-rich objects in chondrites

Details A refractory inclusion in the Kaba CV3 chondrite - Some implications for the origin of spinel-rich objects in chondrites A refractory inclusion in the Kaba CV3 chondrite - Some implications for the origin of spinel-rich objects in chondrites

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..75..297f&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 75, no. 4, Nov. 1985, p. 297-310. NASA-supported research.

Mathematics

Logic

14

Chondrites, Inclusions, Meteoritic Composition, Meteoritic Microstructures, Mineralogy, Petrography, Spinel, Aluminum, Calcium, Chemical Analysis, Magnesium, Meteorites, Cv3 Chondrites, Stony Meteorites, Refractory Material, Origin, Cais, Inclusions, Spinel, Enrichment, Petrography, Mineralogy, Features, Kaba, Description, Comparisons, Nodules, Fractionation, Grains, Matrix, Distillation, Formation, Residue, Condensation, Hypotheses, Accretion, Size, Temperature, Thermal Properties, History, Parent Bodies,

Scientific paper

The first detailed petrographic and mineralogical study of a Ca, Al-rich inclusion (CAI) from the Kaba CV3 chondrite is reported. This 'fine-grained' CAI contains abundant small, rounded, rimmed, spinel-rich objects which have important features in common with the spinel-rich objects in other carbonaceous and ordinary chondrites. These nodules are interpreted as fractionated distillation residues of primitive dust. However, the available data do not unambiguously rule out a condensation origin for at least some of these objects. Finally, the preservation of distinct diopside-hedenbergite rims on the spinel-rich bodies and the small grain size of many minerals in the CAI matrix material both suggest that the CAI accreted cool and had a relatively cool thermal history in the Kaba parent body.

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