Stony meteorite thermal properties and their relationship with meteorite chemical and physical states

Details Stony meteorite thermal properties and their relationship with meteorite chemical and physical states Stony meteorite thermal properties and their relationship with meteorite chemical and physical states

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012m%26ps...47..319o&link_type=abstract

Meteoritics & Planetary Science, Volume 47, Issue 3, pp. 319-329.

Physics

Scientific paper

In our ongoing survey of meteorite physical properties, we have to date measured the thermal conductivity for seventeen stony meteorites at temperatures ranging from 5 K to 300 K. Here, we report new results for nine ordinary chondrites, one enstatite chondrite, and the basaltic achondrites Frankfort (howardite) and Los Angeles (shergottite). We find that thermal conductivity is significantly lower than would be expected from averaging the laboratory conductivities of their constituent minerals, with a dependence on temperature different from the expected conductivity of pure minerals. In addition, we find a linear relationship between the inverse of the porosity of the samples measured and their thermal conductivity, regardless of meteorite composition or type. We conclude that thermal conductivity is controlled by the presence of shock-induced microcracks within the meteorites, which provide a barrier to the transmission of thermal energy via phonons. In contrast to conductivity, our first measurement of heat capacity as a function of temperature (on Los Angeles) suggests that heat capacity is primarily a function of oxide composition and is not strongly affected by the physical state of the sample.

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