Record details

    Kovové kuličky v impaktovém skle z kráteru Meteor v Arizoně
Statement of responsibility
    Vladimír Bouška
Other titles
    The metallic blebs in the impact glass ejecta from the Meteor Crater, Arizona
    Sborník referátů 7.konference o vltavínech - Znojmo 1996 (Variant.)
    Bouška, Vladimír
Source title - serial
    Přírodovědný sborník Západomoravského muzea v Třebíči
    Roč. 31
    s. 29-36
    8 fot., 7 tab., 8 bibl.
Subject group
    chemismus hornin
    metamorfóza impaktní
    sklo přírodní
    studie experimentální
Geographical name
    Dálný východ (Rusko)
Abstract (in english)
   The impact glass fragments are found on the surface of Meteor Crater's ejecta blanket as aerodynamically shaped, centimeter-sized masses of vesicular glass but also contain unmelted quartz grains with planar cleavage and a small amount of Ni-rich metal spherules. Kargel et al.(1995) calculated the mass balance and indicated that the glass was derived by impact melt contributions of roughly 53.5 wt.% of sandstone, 21.7 wt.% devolatilized carbonate, and 24.8 wt.% of iron meteorite. The origin of metallic spherules in the glass was simulated experimentally. The fine pulverized Coconino sadstone and fine filling of Fe-meteorite Sikhote-Alin and, or Canon Diablo were mixed together in the proportion of 99.5% to 0.5% and, or 99.9% to 0.1% and the mixture was inserted in the carbon electrodes with relatively big holes and put into the electric arch of the Zeiss spectrograph PGS 2. The temperature reached 2 780 C+- 100 C.
   The electrodes with holes were filled by the prepared mixture and pressed. Then they were slightly covered with pure carbon dust not to splutter. The exposition time was 12 sec., 25.5 sec., 51 sec., 69 sec., and 88.5 sec. At 12 seconds a thin glassy crust appeared on the surface of the filling only. At 51 seconds and 69 seconds, the glass spherules of silicate glass have arreared and inside there were originated the metallic blebs of about 6-10 um in diameter with high Ni content. At 88.5 sec., all material was almost completaly vaporized. The results are given in Tables 1-7. The Figures represent the Cononino sandstone it self, then impact glass from the Meteor crater and the filling of iron meteorite from Sikhote-Alin and two corroded grains of this fillings and metallic spherule of 8 um in diameter in artifically prepared glass in the spectral arch (Fig. 1-8). A decomposition of carbonates happened during the impact event as well as in experimental process.
   All the material was melted and then during the cooling the metallic blebs with high Ni content and of sphere or oval shape segregated from the s
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    17. 2. 2010
Import date
    8. 8. 2012