Podrobnosti záznamu

    Evolution of the SE Bohemian Massif Based on Geochronological Data - A Review
Údaj o odpovědnosti
    Urs Klötzli, Frank Wolfgang, Susanna Scharbert, Martin Thöni
Další názvy
    Entwicklung der südöstlichen Böhmischen Masse aus geochronologischer Sicht - Ein Überblick
    Klötzli, Urs
    Scharbert, Susanna
    Thöni, Martin
    Wolfgang, Frank
Zdrojový dokument - seriál
    Jahrbuch der Geologischen Bundesanstalt
    Vol. 141, no. 4
    p. 377-394
    7 obr., 1 tab., 3 s.bibl.
    Německé resumé
    Zkr. název ser.: Jb. Geol. Bundesanst. (Wien)
Předmětová skupina
    moldanubický pluton
    vrásnění variské
Geografické jméno
    Česká republika
Klíčové slovo
Abstrakt (anglicky)
   This paper summarises and discusses radiometric age data for the SE part of the Bohemian Massif in Austria. On the basis of Variscan imprint a major division into a Moldanubian part in the W (completely overprinted during the Variscan) and a Moravian part in the E (only partly overprinted during the Variscan) is traditionally made. Furthermore, a subdivision of the Moldanubian into 3 major litho-tectonic nappe series and a suite of Variscan intrusives is implied. Each of these units shows a distinctive chronological evolution: - The Monotonous Series is built up by poly-metamorphic clastic sediments of a late- to post-Cadomian active continental margin. - The overlying Varied Series is formed by Upper Proterozoic to Lower Palaeozoic meta-sediments deposited on a&2 Ga crystalline basement. Invasion by Cadomian intrusives around 640 Ma is indicated.
   - The highest nappe, the Gföhl gneiss-granulite unit, is formed by migmatites and granulites of Lower palaeozoic age and mainly acid magmatic provenance. Nothing is unambiguously known about the pre-Variscan relations of Monotonous Series and Varied Series, respectively. On the basis of absolute age data the Gföhl gneiss-granulite nappe is interpreted as a formerly completely independent terrane. The common Variscan evolution of the Moldanubian units starts with a postulated high-P event and nappe-stacking after 370 Ma (Upper devonian). Cooling after a suseguent high-T metamorphic event begins at 340 Ma (Visean) and lasts at least until 290 Ma (uppermost carboniferous), with a marked tendency to younger cooling ages from E to W. Cause is the early uplift in the E due to the thrusting of the Moldanubian zone onto the Moravian zone.
   The evolution of the Variscan South Bohemian pluton begins with the partial melting of Cadomian basement series at 360 to 350 Ma (Lower Carboniferous) and the formation of large masses of geochemically diverse granitoids (Weinsberg granite, Rastenberg granodiorite) between 350 and 320 Ma
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
Datum vložení
    28. 1. 2008
Datum importu
    8. 8. 2012