Derivation of the thermal history of tektites and lunar glasses from their thermal expansion characteristics

Details Derivation of the thermal history of tektites and lunar glasses from their thermal expansion characteristics Derivation of the thermal history of tektites and lunar glasses from their thermal expansion characteristics

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976lpsc....7.1123a&link_type=abstract

In: Lunar Science Conference, 7th, Houston, Tex., March 15-19, 1976, Proceedings. Volume 1. (A77-34651 15-91) New York, Pergamon

Physics

1

Glass, Lunar Rocks, Tektites, Thermal Expansion, Apollo Flights, Crystallization, Lunar Soil, Metal Oxides, Microanalysis, Rates (Per Time), Surface Cooling

Scientific paper

The unknown past thermal histories of five tektites (two moldavites, two australites, one rizalite) and three lunar glasses (two Apollo 15 green glasses and one Apollo 14 brown-glass fragment) are deduced qualitatively from their thermal expansion characteristics as functions of the preceding cooling rates. The basic principles of glass formation are briefly outlined, and it is shown that the past thermal history of a glass can be deciphered by reheating the glass into its transformation range and studying the time- and temperature-dependent structural changes during approach to equilibrium. Expansion curves, contraction curves, and upper as well as lower limits to derived cooling rates are presented for the various objects examined. It is concluded that the Apollo 15 green glasses were probably formed in a volcanic lava fountain rather than in an impact event.

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