Podrobnosti záznamu

Název
    Cambrian/Ordovician intracontinental rifting and Devonian closure of the rifting generated basins in the Bohemian Massif realms
Údaj o odpovědnosti
    Václav Kachlík, František Patočka
Další názvy
    Pre-Variscan Terrane Analysis of "Gondwanan Europe" (Variant.)
Autor
    Kachlík, Václav
    Patočka, František
Jazyk
    anglicky
Zdrojový dokument - seriál
    Acta Universitatis Carolinae. Geologica
Svazek/č.
    Vol. 42, no. 3-4
Strany
    s. 433-441
Rok
    1998
Poznámky
    8 obr., 2 s.bibl.
    il.
    Zkr. název ser.: Acta Univ. Carol., Geol.
Předmětová skupina
    Barrandien
    bazalt
    krkonošsko-jizerské krystalinikum
    metavulkanity
    paleozoikum-spodní
    terán
    vrásnění kadomské
    vrásnění variské
    vulkanismus
    zóna riftová
Geografické jméno
    ČR-Čechy
Klíčové slovo
    Basins
    Bohemian
    Cambrian/Ordovician
    Closure
    Devonian
    Generated
    Intracontinental
    Massif
    Realms
    Rifting
Abstrakt (anglicky)
   The gravimetrically dense block of the Teplá-Barradian terrane (TBT) forms the Bohemian Massif NW interior. The Late Proterozoic basement of the Bohemian terrane experinsed low-grade Cadomian metamorphism and deformation. It is unconformably overlain by the simply folded unmetamorphosed Early palaeozoic extension related sedimentary and volcanic sequences of the Barrandian basin. Along the Elbe fault (to the NE) another gravity high neighbours the Teplá-Barrandian terrane. This dense body in boundaries corresponds to the Krkonoše-Jizera Unit which is suspect terrane in the West Sudetes mosaic, termed the Krkonoše-Jizera terrane (KJT). The TBT and KJT share some essential features of the pre-Variscan history. On the other hand, they differ substantially in the Variscan orogenic development. In spite of many similarities they may represent separate basins fills, which were accumulated during Early Palaeozoic rifting of Cadomian peri-Gondwana basement.
   According to the structural features and metamorphic inverse pattern, the KJT may be interpreted as the stack of para-autochthonous slices (derived probably from the Saxothuringian ocean and adjacent passive margin) thrust to the NW on the Saxothuringian foreland during Variscan collision of the Teplá-Barrandian and Saxothuringian terranes. Volcanic and sedimentary records of the KJT allochthonous slices commenced prior to the subduction related early Variscan blueschist facies metamorphism (terminated at ca. 360 Ma) which is rather ubiquitous in the KJT (with exception of the westernmost part - the Ještěd Unit). Taking into account modern active plate margin geometry and plate convergence rates, the onset of this metamorphism might be contemporaneous with the Early Givetian Variscan tectonism (375 to 380 Ma) which marks the end of the Early Palaeozoic sedimentation in the TBT.
   Provenance and palaeotectonic of the allochthonous slices thus are uncertain and hypothetic relations to the Teplá-Barrandian terrane may be considered
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    17. 8. 2007
Datum importu
    8. 8. 2012