Origin of spinel-rich chondrules and inclusions in carbonaceous and ordinary chondrites

Details Origin of spinel-rich chondrules and inclusions in carbonaceous and ordinary chondrites Origin of spinel-rich chondrules and inclusions in carbonaceous and ordinary chondrites

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...14..588k&link_type=abstract

(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge

Physics

3

Carbonaceous Chondrites, Chondrule, Galactic Evolution, Inclusions, Meteoritic Composition, Spinel, Cosmic Dust, Cosmochemistry, Mathematical Models, Mineralogy, Petrology, Meteorites, Carbonaceous Chondrites, Origin, Spinel, Ordinary Chondrites, Enrichment, Inclusions, Composition, Models, Analysis, Calculations, Major Elements, Refractory Elements, Condensation, Pressure, Liquids, Distilation, Residue, Evaporation, Ablation, Collisions, Size, Comparisons, Trace Elements, Platinum, Metals

Scientific paper

The evaluation of three models of the origin of spinel-rich chondrules and inclusions presented here includes new calculations of the major-element refractory mineral condensation sequence from a gas of solar composition over a wide pressure interval. Condensation calculations show that spinel-rich chondrules did not crystallize from metastable liquid condensates, and that spinel-rich inclusions are not aggregates of refractory nebular condensates. It is proposed that spinel-rich objects are fractionated distillation residues of small aggregates of primitive dust that lost Ca, Si-rich partial melts by evaporation, ablation, or splashing during collisions. This model also explains why spinel-rich chondrules and inclusions (1) are usually smaller than melilite-rich chondrules and inclusions; (2) often have highly fractionated trace-element compositions; and (3) usually do not contain Pt-metal nuggets even when they are more enriched in the Pt-group metals than nugget-bearing melilite-rich objects.

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