Abstract
The Tieschitz unequilibrated H-group chondrite accreted at (800±100) °C during rapid cooling 11. From their mineral chemistry, nine other H-group chondrites, exhibiting greater degrees of equilibration, also formed hot. Degree of equilibration is equated with slowness of cooling, especially below about 700 °C. If metamorphism is defined as change brought about by an increase in temperature, in the H-group chondrites it is recognized only in the localized effects of transient reheating, probably induced by shock.
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Hutchison, R., Bevan, A., Agrell, S. et al. Thermal history of the H-group of chondritic meteorites. Nature 287, 787–790 (1980). https://doi.org/10.1038/287787a0
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DOI: https://doi.org/10.1038/287787a0
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