Podrobnosti záznamu

Název
    Numerical modelling of tektite origin in oblique impacts: Implication to Ries-Moldavite strewn field
Údaj o odpovědnosti
    Natalija Artemijeva, Elisabetta Pierazzo, Dieter Stöffler
Autor
    Artemijeva, Natalija
    Pierazzo, Elisabetta
    Stöffler, Dieter
Jazyk
    anglicky
Zdrojový dokument - seriál
    Věstník Českého geologického ústavu (Bulletin of the Czech Geological Survey)
Svazek/č.
    Roč. 77, č. 4
Strany
    s. 303-311
Rok
    2002
Poznámky
    5 obr., 3 tab., 45 bibl.
    il.
    Zkr. název ser.: Věst. Čes. geol. Úst. (Bull. Czech geol. Surv.)
Předmětová skupina
    geneze
    jevy šokové
    kráter impaktní
    kráter Ries
    kvartér Českého masivu
    model matematický
    moldavit
    tektity
Geografické jméno
    Česká republika
    Rakousko-Niederösterreich
    SRN-Bayern
    SRN-Sachsen
Klíčové slovo
    Field
    Impacts
    Implication
    Modelling
    Numerical
    Oblique
    Origin
    Ries-Moldavite
    Strewn
    Tektite
Abstrakt (anglicky)
   On the basis of detailed geological, petrographic, geochemical, and geographical information we have performed a numerical modeling study of three related and coeval impact features: The Steinheim crater (apparent diameter Da = 3.8 km), the Ries crater (Da = 24 km) in South-era Germany, and the moldavite (tektite) strewn field in Bohemia and Moravia (Czech Republic), Lusatia (East Germany), and Lower Austria. The moldavite strewn field extends from about 200 km to 450 km away from the centre of the Ries to the ENE forming a fan with an angle of about 57°. According to this modeling work, an oblique impact of a binary asteroid from a WSW direction appears to be a reasonable working hypothesis to explain the setting of the craters and the formation and distribution of the moldavites. We carried out a series of 3D hydrocode simulations of a Ries-type impact.
   The results confirm previous results indicating 30° from the horizon as the most probable angle for near surface melting, and, consequently for the formation of tektites. Finally, the simulation of the motion of impact-produced tektite particles through the atmosphere produces a narrow-angle, downrange, distant distribution of the moldavite tektites in a fan-like field with an angle of about 75°. Although the calculated distribution still deviates to some degree from the known distribution of the moldavites, our results represent an important step toward a better understanding of the origin and distribution of the high-velocity surface melt (tektites) and the low-velocity, deep-seated melt (coherent clast-laden melt) resulting from an oblique impact on a stratified target
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    10. 7. 2007
Datum importu
    8. 8. 2012