Chondrite thermal histories - Clues from electron microscopy of orthopyroxene

Details Chondrite thermal histories - Clues from electron microscopy of orthopyroxene Chondrite thermal histories - Clues from electron microscopy of orthopyroxene

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..46..167a&link_type=abstract

Earth and Planetary Science Letters, vol. 46, no. 2, Jan. 1980, p. 167-177. Research supported by the Natural Environment Resea

Mathematics

Logic

13

Chondrites, Meteoritic Composition, Petrology, Pyroxenes, Thermodynamic Properties, Annealing, Chemical Evolution, Chondrule, Electron Microscopes, Lamella, Microstructure, Meteorites, Chondrites, Thermal History, Electron Microscopy, Data, Orthopyroxene, Allegan Meteorite, Quenggouk Meteorite, H Chondrites, Comparisons, St. Severin Meteorite, Ambapur Nagla Meteorite, Oxides, Optical Properties, Clinopyroxenes, Models, Evolution, Cooling, Metamorphism, Petrology, Origin, Observations, Ll Chondrites, Crystal

Scientific paper

Optically 'striated' orthopyroxenes in two ordinary chondrites, Allegan (H5) and Quenggouk (H4), are compared with shock-affected orthopyroxenes in Saint-Severin (LL6) and Ambapur Nagla (H5) by high-voltage transmission electron microscopy. The striated orthopyroxenes have very many, thin, evenly distributed lamellae of clinopyroxene. They are undeformed and also lack evidence of partial inversion from clinopyroxene to orthopyroxene. Striated orthopyroxene does not seem to be a reliable indicator of prograde metamorphism. Instead, it is interpreted as inverted protopyroxene, produced during the cooling of chondrules at slower rates than the rapid quenching of Type 3 chondrules. The conclusions are consistent with retrograde models for the evolution of H-group chondrites, in which the higher petrologic types are attributed to retarded cooling due to accretionary processes leading to the growth of the parent body.

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