Mathematics – Logic
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55..581s&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 55, Feb. 1991, p. 581-599.
Mathematics
Logic
37
Carbonaceous Chondrites, Chemical Composition, Inclusions, Isotope Separation, Olivine, Earth Mantle, Fractionation, Grain Size, Microstructure, Mineralogy, Meteorites, Carbonaceous Chondrites, Chondrites, Olivine, Mineralogy, Stony Meteorites, Origin, Formation, Inclusions, Plagioclase, Models, Samples, Meteorite, Description, Petrography, Chemistry, C Chondrites, Melting, Partial Melting, Isotopes, Fractionation, Magnesium, Mixing, Comparisons, Composition, Homogeneity, Thermal History, Parent Material, H
Scientific paper
The origin of plagioclase-olivine inclusions (POIs) from three CV chondrites and one ungrouped chondrite was investigated by examining the chemical, mineralogical, and isotopic characteristics of a group of POIs from these chondrites. Results of these analyses demonstrate that the mixing and the partial melting processes in these inclusions were superimposed on more ancient isotopically heterogeneous material. A comparison of the essential characteristics of POIs and CAIs suggests that the major processes leading to the formation of POIs (such as condensation, dust/gas fractionation, aggregation of chemically and isotopically disparate materials, and partial melting) are common to most CAIs and chondrules. A scenario for the origin of POIs is proposed, showing that the homogeneity of the final assemblage (whether a POI, a CAI, or a chondrite) is primarily a reflection of the thermal history rather than the nature of precursor materials.
Hutcheon Ian D.
Sheng Y. J.
Wasserburg Gerald J.
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