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  • 1
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    Origin of tektites (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The origin of tektites has been obscure because of the following dilemma. The application of physical principles to the data available on tektites points strongly to origin from one or more lunar volcanoes; but few glasses of tektite composition have hitherto been reported from the lunar samples. Instead, the lunar silicic glasses consist chiefly of a material very rich in K2O and poor in MgO. The ratio of K2O/MgO is higher in these glasses than in any tektites reported. The solution of the dilemma seems to come from the study of some recently discovered terrestrial deposits of tektite glass with high values of K2O/MgO at the Cretaceous Tertiary boundary. These glasses are found to be very vulnerable to crystallization into sandine or to alteration to smectite. These end products are known and are more abundant than any terrestrial deposits of tektite glass. It seems possible that, in fact, the moon produces tektite glass, mostly of the high K2O-low MgO type; but on Earth these deposits are destroyed. The much less abundant deposits with lower K and higher Mg are observed because they survive. Other objections to the lunar origin hypothesis appear to be answerable.
    Keywords: ASTROPHYSICS
    Type: Meteoritics (ISSN 0026-1114); 29; 1; p. 73-78
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Zhamanshin and Aouelloul - Craters produced by impact of tektite-like glasses? (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: It is shown that the enhanced abundance of siderophile elements and chromium in tektite-like glasses from the two impact craters of Zhamanshin and Aouelloul cannot be explained as a result of contamination of the country rock by meteorites nor, probably, comets. The pattern is, however, like that found in certain Australasian tektites, and in Ivory Coast tektites. It is concluded, in agreement with earlier suggestions by Campbell-Smith and Hey, that these craters were formed by the impact of large masses of tektite-like glass, of which the glasses which were studied are fragments. It follows that it is necessary, in considering an impact crater, to bear in mind that the projectile may have been a glass.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Meteoritics (ISSN 0026-1114); 22; 219-228
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The Latest Achievements of Physical Geodesy (1961)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: No abstract available
    Keywords: Geophysics
    Type: Journal of Geophysical Research; Volume 66; No. 6; 1992-1993
    Format: application/pdf
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