Podrobnosti záznamu

    Granitoid-Typen in postkinematischen Granitoidplutonen: Abbilder von autonomen Intrusionsschüben - Beispiele vom Nordrand des Böhmischen Massivs (Erzgebirge - Harz - Flechtinger Scholle - Lausitz)
Údaj o odpovědnosti
    Friedrich Schust, Jürgen Wasternack
Další názvy
    Granitoid rock types within postkinematic granitoid plutons: the reflections of autonomous intrusion pulses (batches) - Examples from the Northern borderzone of the Bohemian Massiv (Erzgebirge - Harz - Flechtingen Block - Lausitz, Germany)
    Schust, Friedrich
    Wasternack, Jürgen
Zdrojový dokument - seriál
    Zeitschrift für geologische Wissenschaften
    Jg. 30, Nr. 1-2
    12 obr., 1 fot., 5 pl.
    Anglické resumé
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Z. geol. Wiss.
Předmětová skupina
    chemismus hornin
    kontrola tektonická
    krkonošsko-jizerský pluton
    krušnohorský pluton
    lužický pluton
    západosudetská oblast
Geografické jméno
Klíčové slovo
Abstrakt (anglicky)
   The "granite tectonics" (H. CLOOS 1922, 1925) as well as especially the modern models of the origin of granitoid plutons which are based on the contact-parallel planar stress-related alignment fabrics of minerals and/or xenoliths (e.g. RAMSAY 1989, REY 1998) do not consider the internal subdivision by mostly several granitoid rock types for the interpretation of pluton origin. In the formation models each pluton is treated as one body. Their rock variety is explained by the idea of ballooning. There are no indications for ballooning in our examples concerning the roof uplifting effect of this process, though si-fabrics of the phyllitic and gneissic envelope of the most plutons in our area present a sensitive indicator.Topics of this paper are observations about the structure of postkinematic plutons by distinguishable granitoid types (granites and granodiorites), about the features that allow the distinction of these rock types and about the intrusion-tectonic position of the types.
   The observations where carried out in the postkinematic Variscan plutons of the Saxonian Erzgebirge (Saxothuringian zone), of the Harz and of the block of Flechtingen-Rofilau (NE Rhenohercynian zone) and in the Cadomian-Cambrian as well as in the Cambrian-Ordovician plutons of the Saxonian Lausitz (Lausitz-Jizera-Karkonosze zone)In each of the plutons can be distinguished some to numerous granitoid types. We regard them as the solidification products of individual intrusion pulses or batches. So they form the smallest geological objects ("smallest bricks") within the plutons.Beyond it, in the postkinematic granites of the Erzgebirge, are distinguished granite types and granite intrusion phases (in the sense of KOPTEV-DVORNIKOV 1952, BUSKIN and MARIN 1973, and FÖRSTER and TlSCHENDORF 1994, but not in the sense of COBBING et al. 1992). Here, each granite intrusion phase is realized by one ore numerous granite types.
   It reflects by the mean values of the characteristics of their granite-types the level of the directed development of the petrochemical and geochemical composition and of the texture in the granite-forming magma. Each granite type and, in general, each granitoid type represents by the same characteristics as in the granite intrusion phase the state of its own magmatic intrusion.Granitoid types can be recognized and distinguished by: (1) features of petrographic and geochemical autonomy and (2) features of demarcation, that allow the distinction of intrusion-tectonic units.Ad (1): granitoid types are distinguished by the qualitative and quantitative characteristics of their texture (type of texture, mean values of grain size) and by their substantial characteristics (mode, contents of main and trace elements, existence of characteristic _minerals or elements).
   Homogenity of the fabric (grain size, texture of the rock forming minerals) and of the modal composition (within a certain range of variation) are the most important features for megas
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
Datum vložení
    6. 3. 2008
Datum importu
    8. 8. 2012