Podrobnosti záznamu

Název
    Geochemical characteristics of basement target rocks, suevitic glasses from the Eyreville B drill core, Chesapeake Bay impact structure, and three bediasites
Autor
    Deutsch, A.
    Langenhorst, F.
    Skála, Roman
Jazyk
    anglicky
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
Strany
    S. 435-445
Poznámky
    Rozsah: 11 s. : WWW810009975
    Výzkumný záměr: CEZ:AV0Z30130516
Předmětová kategorie
    bediasites
    Chesapeake Bay impact crater
    Eyreville B core hole
    geochemistry
    impact glasses
    tektites
Klíčové slovo
    Basement
    Bay
    Bediasites
    Characteristics
    Chesapeake
    Core
    Drill
    Eyreville
    Geochemical
    Glasses
    Impact
    Rocks
    Structure
    Suevitic
    Target
    Three
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.
Přispěvatel
    AV ČR Brno, Geologický ústav
Kód přispěvatele
    AV ČR, GLÚ
Zdrojový formát
    U
Datum importu
    8. 8. 2012