The Boiling-Point Technique for the Determination of the Vapor Pressures of Silicate Melts
Determination of the total vapor pressure of silicate melts was undertaken to provide basic data for the aerodynamic study of atmospheric entry of tektites. These small natural glassy objects (see O’Keefe, 1963, 1966) consist of around 70% SiO2 plus alumina, lime, magnesia, alkali- and iron-oxides. Although considerable argument exists about their origin, it is generally believed that tektites are formed in either lunar or terrestrial meteorite impacts, and that they entered the earth’s atmosphere at high velocities as solid glass. During their passage through the atmosphere, the front surface was heated to high temperatures and experienced significant ablation (Chapman and Larson, 1963; Walter and Adams, 1967).
KeywordsSiO2 Magnesia Depression Silicate Steam
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- Chapman, D.R. and Larson, H.K. (1963). The lunar origin of tektites, NASA Tech. Note TN D-1556.Google Scholar
- Kubaschewski, O. and Evans, E.L. (1958). Metallurgical thermochemistry. London: Pergamon Press.Google Scholar
- O’Keefe, J.A. (1963). Tektites. Chicago: U. of Chicago Press.Google Scholar
- O’Keefe, J.A. (1966). The origin of tektites. Space Sci. Rev., 6: 174–221.Google Scholar