Multiple parent bodies of ordinary chondrites

Details Multiple parent bodies of ordinary chondrites Multiple parent bodies of ordinary chondrites

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..68...34y&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 68, no. 1, April 1984, p. 34-42.

Mathematics

Logic

28

Chondrites, Evolution (Development), Temperature Distribution, Thermal Conductivity, Porosity, Sintering, Meteorites, Ordinary Chondrites, Parent Bodies, Origin, Source, History, Thermal Properties, Conductivity, Size, Temperature, Radioactive Elements, Interiors, Gradients, Sintering, Models, Petrology

Scientific paper

Thermal histories of chondrite parent bodies are calculated from an initial state with material in a powder-like form, taking into account the effect of consolidation state on thermal conductivity. The very low thermal conductivity of the starting materials makes it possible for a small body with a radius of less than 100 km to be heated by several hundred degrees even if long-lived radioactive elements in chondritic abundances are the only source of heat. The maximum temperature is determined primarily by the temperature at which sintering of the constituent materials occurs. The thermal state of the interior of a chondrite parent body after sintering has begun is nearly isothermal. Near the surface, however, where the material is unconsolidated and the thermal conductivity is much lower, the thermal gradient is quite large. This result contradicts the conventional "onion-shell" model of chondrite parent bodies. But because the internal temperature is almost constant through the whole body, it supports a "multiple-parent bodies" model, according to which each petrologic type of chondrite comes from a different parent body.

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