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• W2083018071 abstract "Major and minor element bulk compositions of 373 individual chondrules from 18 H3 to H6 chondrites were determined in polished thin sections by broad-beam electron probe analysis. Bulk chondrule FeO and Al2O3 increase and TiO2 and Cr2O3 decrease with increasing petrologic type; normative fayalite, albite and plagioclase increase through the petrologic sequence. Chondrule diameters correlate with phenocryst sizes in porphyritic chondrules of type 3 chondrites, but this correlation is diminished in the higher petrologic types. Furthermore, for a given chondrule diameter, phenocryst sizes are larger in the higher petrologic types. We attribute most compositional trends in chondrules through the petrologic sequence to diffusion and equilibration among chondrules and between chondrules and matrix in response to increasing degrees of thermal metamorphism. Increased phenocryst sizes in the higher petrologic types are probably the result of grain growth during metamorphism. We suggest that H-group chondrites formed by accretion of high-temperature (chondrules) and low-temperature (matrix) materials. Parent materials of each of the petrologic types resembled type 3 chondrites, but had slight compositional differences (e.g. volatiles, rare gases, total iron) inherited during accretion. These differences were predominantly functions of decreasing temperature in the nebula as accretion progressed. Internal reheating of the parent materials to different temperatures and (probably) for different times, as a function of depth in the parent body, caused compositional equilibration, grain coarsening, and reduction of FeO to Fe° by carbon." @default.
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• W2083018071 date "1980-06-01" @default.
• W2083018071 modified "2023-09-23" @default.
• W2083018071 title "Metamorphism of the H-group chondrites: implications from compositional and textural trends in chondrules" @default.
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• W2083018071 doi "https://doi.org/10.1016/0016-7037(80)90265-3" @default.
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