The record in the meteorites--V A thermometer mineral in the Mighei carbonaceous chondrite

Details The record in the meteorites--V A thermometer mineral in the Mighei carbonaceous chondrite The record in the meteorites--V A thermometer mineral in the Mighei carbonaceous chondrite

May 1961

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961gecoa..23..200d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 23, Issue 3-4, pp.200-202

Physics

9

Scientific paper

Mighei contains submicrogram fragments of strained glass of refractive index 1.55 which can be annealed at temperatures below 300°C. The time-temperature curve for annealing has been determined, and serves as an upper boundary for the thermal experiences of the meteorite since the time its constituent minerals were brought together. Mighei cannot have been heated to 180°C for more than a few weeks, to 250°C for more than a fraction of an hour and can never have been heated to 300°C. Hypotheses concerning the origin of the glass are presented: Their common element is the action of aqueous solutions. It is shown that thermal action alone is inadequate.

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