Podrobnosti záznamu

Název
    Carboniferous-Permian volcanic evolution in Central Europe-U/Pb ages of volcanic rocks in Saxony (Germany) and northern Bohemia (Czech Republic)
Autor
    Breiter, Karel
    Breitkreuz, Ch.
    Hoffmann, U.
    Sergeev, S.
    Stanek, K.
    Tichomirowa, M.
Jazyk
    anglicky
Typ dokumentu
    článek v odborném periodiku
Zdrojový dokument - seriál
    International Journal of Earth Sciences
Svazek/č.
    Roč. 102, č. 1
Strany
    s. 73-99
Rok
    2013
Poznámky
    Rozsah: 27 s. : WWW
Předmětová kategorie
    dykes
    Pb/Pb single zircon age
    pyroclastic rocks
    SHRIMP U/Pb ages
    stratigraphy
    Variscides
Klíčové slovo
    Ages
    Bohemia
    Carboniferous-Permian
    Central
    Czech
    Europe-U/Pb
    Evolution
    Germany
    Northern
    Republic
    Rocks
    Saxony
    Volcanic
Abstrakt (anglicky)
   Nine SHRIMP U/Pb ages on zircon and two Pb/Pb single zircon ages have been determined from Late Paleozoic volcanic rocks from Saxony and northern Bohemia. Samples came from the Teplice-Altenberg Volcanic Complex, the Meissen Volcanic Complex, the Chemnitz Basin, the Döhlen Basin, the Brandov-Olbernhau Basin, and the North Saxon Volcanic Complex. The Teplice-Altenberg Volcanic Complex is subdivided into an early Namurian phase (Mikulov Ignimbrite, 326.8 ? 4.3 Ma), thus older than assumed by previous studies, and a late caldera-forming phase (Teplice Ignimbrite, 308.8 ? 4.9 Ma). The age of the latter, however, is not well constrained due to a large population of inherited zircon and possible hydrothermal overprint. The Leutewitz Ignimbrite, product of an early explosive volcanic episode of the Meissen Volcanic Complex yielded an age of 302.9 ? 2.5 Ma (Stephanian A).
   Volcanic rocks intercalated in the Brandov-Olbernhau Basin (BOB, 302 ? 2.8 Ma), Chemnitz Basin (CB, 296.6 ? 3.0 Ma), Döhlen Basin (DB, 296 ? 3.0 Ma), and the North Saxon Volcanic Complex (NSVC, c. 300-290 Ma) yielded well-constrained Stephanian to Sakmarian ages. The largest Late Paleozoic ignimbrite-forming eruption in Central Europe, the Rochlitz Ignimbrite, has a well-defined middle Asselian age of 294.4 ? 1.8 Ma. Ages of palingenic zircon revealed that the Namurian-Westphalian magmatism assimilated larger amounts of crystalline basement that formed during previous Paleozoic geodynamic phases. The Precambrian inherited ages support the chronostratigraphic structure assumed for the Saxo-Thuringian Zone of the Variscan Orogen. The present results help to improve the chronostratigraphic allocation of the Late Paleozoic volcanic zones in Central Europe.
   At the same time, the radiometric ages have implications for the interbasinal correlation and for the geodynamic evolution of the Variscan Orogeny.
Přispěvatel
    AV ČR Brno, Geologický ústav
Kód přispěvatele
    AV ČR, GLÚ
Zdrojový formát
    U
Datum importu
    23. 10. 2014