Skip to main content Accessibility help

Volatility of oxides from silicate melt and the origin of moldavites

  • J. Konta (a1) and L. MráZ (a1)


The volatilities of SiO2, Na2O, and Fe2O3 1 increase with increasing thermal function within the range 1600 to 2100°C during the melting of a sandy-silty clay. The remaining melt is to some extent enriched in Al2O3, K2O, CaO, and MgO. Chemical analyses of the sandy-silty clay, of the glasses melted from the latter, of the silicate material evaporated and newly condensed and their correlation with increasing thermal function and bulk density of glasses, as well as with the hitherto known quantitative data on moldavites, testify to the fact that in moldavites evaporated and newly condensed silicate material substantially prevails over material that passed directly from a solid to a fluid state. Evaporation of the silicate material from the rocks of the impact crater caused a significant change in relations between major oxides compared to the original relations in the source rocks. Thus, the hypothesis that tektites are directly remelted rocks of the Earth's crust, based on over-all chemical similarities of tektites and some rocks in major oxides, appears incorrect.



Hide All
Adams, (J. A. S.), Osmond, (J. K.), and Rogers, (J. J. W.), 1959. Phys. Chem. Earth, 3, 298-348.
Barnes, (V. E.), 1964. Geoehimiea Acre, 28, 893913 [M.A. 17-61].
Barnes, (V. E.), 1968. Tektites. Repr. from International Dictionary of Geophysics, 112. Oxford (Pergamon).
Barnes, (V. E.), 1969. Geochimica Acta, 33, 1121-3 [M.A. 21-560].
Bouška, (V.), 1968. Lithos, 102-12 [M.A. 20-495].
Bouška, (V.), Faul, (H.), and Naeser, (C. W.), 1968. Acta Univ. Carol., ser. geol., 277-86 [M.A. 21-2479].
Bouška, (V.), and Povondra, , 1964. Geochimica Acre, 28, 783-91 [M.A. 17-295].
Bouška, (V.), 1966. Chemické složenf vltavínů (Chemical composition of moldavites), Časopis miner. geol., 11, 8997 (Praha).
Chapman, (D. R.) and Schemer, (L. C.), 1969. Journ. Geophys. Res. 74, 6737-76.
Faul, (H.), 1966. Science, 152, 1341-5.
Gentner, (W.), 1971. Abstracts of the Meteoritical Soc. 34th Ann. Meeting, Tübingen, Germany.
Gentner, (W.), Lippolt, (H. J.), and Schaefrer, (O. A.), 1963. Geochimica Acta, 27, 191200 [M.A. 16-277].
Greenland, (L.) and Lovering, (J. F.), 1965. Ibid. 29, 563-7 [M.A. 17-688].
Heide, (F.), 1961. Acta Geol. Ae. Sci. Hunger., 7, fasc. 1-2, 105-7.
Konta, (J.), 1966. Aeta Univ. Carol., ser. geol., 81-97 [M.A. 19-44].
Konta, (J.), 1971a. Abstracts of the Meteoritical Soc. 34th Ann. Meeting, Tübingen, Germany.
Konta, (J.), 1971b. Min. Mag. 38, 408-17 [M.A. 23-447].
Konta, (J.), 1971c. Acta Univ. Carol., ser. geol., 299-308.
Konta, (J.), 1972. Ibid. 31-45.
Konta, (J.), and Mráz, (L.), 1969. Geochimica Acta, 33, 1103-11 [M.A. 21-559].
McDougall, (I.) and Lovering, (J. F.), 1969. Ibid. 33, 1057-70 [M.A. 21-562].
O'keefe, (J. A.), 1966. Space Sci. Reviews, 6, No. 2, 174221.
Philpotts, (J. A.) and Pinson, (W. H.), 1966. Geochimiea Acta, 30, 253-66 [M.A. 18-37].
Pinson, (W. H.) and Schnetzler, (C. C.), 1962. Nature, 193, 233-4 [M.A. 16-55].
Rost, (R.), 1964. Geochimica Acta, 28, 931-6 [M.A. 17-62].
Rost, (R.), 1966. Sbornik Ndrod. musea v Praze, 22, B, 169-91.
Rost, (R.), 1967. Acta Univ. Carol., ser. geol., 95-112 [M.A. 19-214].
Rost, (R.), 1972. Vltavíny a tektity (Moldavites and Tektites). Praha (Academia Press), 241.
Schnetzler, (C. C.) and Prnson, (W. H.), 1963. Tektites (Ed. O'keefe), Ch. 4, 95-129. Univ. Chicago Press.
Spencer, (L. J.), 1933. Nature, 131, 117-18 [M.A. 5-304].
Störr, (M.) and Konta, (J.), 1964. Chemie der Erde, 259-78 [M.A. 17-294].
Taylor, (S. R.), 1966. Geochimica Acta, 30, 1121-36 [M.A. 18-II3].
Taylor, (S. R.), and Sacias, (M.), 1964. Ibid. 28, 235-64 [M.A. 16-641].
Walter, (L. S.), 1967. Ibid. 31, 2043-63 [M.A. 19-214].
Walter, (L. S.), and Carron, (M. K.), 1964. Geochimica Acta, 28, 937-51 [M.A. 17-61].
Zähringer, (J.), 1963. Tektites (Ed. O'keere), 137-49. Univ. Chicago Press.

Volatility of oxides from silicate melt and the origin of moldavites

  • J. Konta (a1) and L. MráZ (a1)


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed