Evidence for the three-stage cooling history of olivine-porphyritic fluid droplet chondrules

Details Evidence for the three-stage cooling history of olivine-porphyritic fluid droplet chondrules Evidence for the three-stage cooling history of olivine-porphyritic fluid droplet chondrules

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46..317p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, Mar. 1982, p. 317-330.

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Chondrites, Chondrule, Cooling, Igneous Rocks, Olivine, Drops (Liquids), Isothermal Processes, Mathematical Models, Photomicrography, Quenching (Cooling), Solar System, Meteorites, Chondrules, Cooling, History, Thermal Properties, Olivine, Melts, Experiments, Procedure, Models, Fractional Crystallization, Diffusion, Composition, Tieschitz Meteorite, H3 Chondrites, Phenocrysts, Ordinary Chondrites, Origin, Equipment, Data, Analysis, Parameters, Mineralogy, Texture, Photomicrographs, Comparisons, Fayalite

Scientific paper

A three-stage model for the cooling of olivine-porphyritic fluid droplet chondrules found in ordinary chondrites is proposed, in light of an experimental examination of three haplochondritic melts to determine thermal parameters in a pre-accretionary chondrule environment. The model encompasses: (1) initial continuous cooling from at least liquidus temperatures, at 300-4000 C/hour, to about 1300 C, over approximately 5-60 min; (2) interruption of the initial cooling by a short-duration isothermal event at about 1300 C; and (3) quenching. This thermal model, in which the entire history of fluid droplet chondrules is only a brief process in the early history of the solar system, suggests a specific and restricted physical origin for chondrules which is not likely to have been achieved by such repetitive, small-scale events as planetary surface impact splattering or volcanism. A single, large-scale event is postulated.

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