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Science 9 June 1967:
Vol. 156. no. 3780, pp. 1357 - 1358
DOI: 10.1126/science.156.3780.1357
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Articles

Oxygen Isotopes: Experimental Vapor Fractionation and Variations in Tektites

Louis S. Walter 1 and Robert N. Clayton 2

1 Laboratory for Theoretical Studies, Goddard Space Flight Center, Greenbelt, Maryland
2 Enrico Fermi Institute for Nuclear Studies, University of Chicago, Chicago, Illinois

High-temperature (about 2800°C) vapor fractionation of a silicate glass that originally contained 82 percent by weight of SiO2 resulted in a decrease of the silica content to 45 percent. Oxygen isotope analyses show that the O18/O16 ratio increased from 13.80 per mil in the starting material to 14.47 and 15.03 per mil in the residuum. This suggests that bediasites, which also exhibit an increase in this ratio with decreasing content of silica, have been subjected to a process of vapor fractionation.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Oxygen Isotope Constraints on the Origin of Impact Glasses from the Cretaceous-Tertiary Boundary.
J. D. Blum, J. D. Blum, and C. P. Chamberlain (1992)
Science 257, 1104-1107
   Abstract »    PDF »
18O/16O, 30Si/28Si, D/H, and 13C/12C Studies of Lunar Rocks and Minerals.
S. Epstein, S. Epstein, and H. P. Taylor Jr. (1970)
Science 167, 533-535
   Abstract »    PDF »
Oxygen Isotope Fractionation between Minerals and an Estimate of the Temperature of Formation.
N. Onuma, N. Onuma, R. N. Clayton, and T. K. Mayeda (1970)
Science 167, 536-538
   Abstract »    PDF »


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