Podrobnosti záznamu

    Geochemical characteristics of basement target rocks, suevitic glasses from the Eyreville B drill core, Chesapeake Bay impact structure, and three bediasites
    Deutsch, A.
    Langenhorst, F.
    Skála, Roman
Typ dokumentu
    část monografie (kapitola)
Zdrojový dokument - monografie
    The ICDP-USGS Deep Drilling Project in the Chesapeake Bay impact structure : results from the Eyreville core holes
    S. 435-445
    Rozsah: 11 s. : WWW810009975
    Výzkumný záměr: CEZ:AV0Z30130516
Předmětová kategorie
    Chesapeake Bay impact crater
    Eyreville B core hole
    impact glasses
Klíčové slovo
Abstrakt (anglicky)
   The ICDP-USGS Eyreville B core hole sampled the 35.5-Ma-old Chesapeake Bay impact crater, Virginia. Chemical analyses of impact glasses, crystalline target rocks, and bediasites allowed better constraining of the precursor materials of glasses as well as of the bediasites. Statistical treatment diveded the data for the crystalline basement samples into four groups; two of those (various schists, meta-graywackes, and gneisses) display characteristics similar to the impact glasses in the suevites and the bediasites. The suevitic glasses show a broad range in composition at the micrometer scale. These data show the frequent presence of schlieren, and in particular, enhanced TiO2 contents that require admixture of an "amphibolitic component" to the melt. The three studied bediasites show only minor inter- and intrasample heterogeneity. The new data for the bediasites are compatible with heating of the "tektite melt" to extreme temperatures, followed by rapid quenching.
    AV ČR Brno, Geologický ústav
Kód přispěvatele
    AV ČR, GLÚ
Zdrojový formát
Datum importu
    8. 8. 2012