Metamorphism of the H-group chondrites - Implications from compositional and textural trends in chondrules

Details Metamorphism of the H-group chondrites - Implications from compositional and textural trends in chondrules Metamorphism of the H-group chondrites - Implications from compositional and textural trends in chondrules

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44..841l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 44, June 1980, p. 841-855.

Mathematics

Logic

3

Chondrites, Chondrule, Metamorphism (Geology), Meteoritic Composition, Petrology, Aluminum Oxides, Chromium Oxides, Electron Probes, Fayalite, Grain Boundaries, Iron Oxides, Temperature Effects, Textures, Titanium Oxides, Meteorites, H Chondrites, Metamorphism, Composition, Textures, Matrix, Chondrules, Major Elements, Minor Elements, Electron Probe, Analysis, Petrology, Diameter, Thermal Effects, Size, Grains, Accretion, Depth, Parent Bodies, Heating, Origin, Formation, Models, Reduction, Inaa, Techniques,

Scientific paper

The paper discusses element bulk compositions of 373 chondrules from 18 H3 to H6 chondrites determined by broad-beam electron probe analysis. Bulk chondrule FeO and Al2O3 amounts increase and TiO2 and Cr2O3 decrease with increasing petrologic type; normative faylite, albite, and plagioclase amounts 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. The compositional trends in chondrules through the petrologic sequence are attributed to diffusion and equilibration among chondrules, and between chondrules and matrix in response to increasing degrees of thermal metamorphism. It is suggested that H-group chondrites are formed by accretion of high-temperature (chondrules) and low-temperature (matrix) materials. Internal reheating of the parent materials to different temperatures caused compositional equilibration, grain coarsening, and reduction of FeO to Fe(0) by carbon.

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