Podrobnosti záznamu

Název
    Perpendicular linear fabrics in granite: markers of combined simple shear and pure shear flows : qranite: From Segregation of Melt to Emplacement Fabrics
Údaj o odpovědnosti
    Karel Schulmann, Josef Ježek, Zdeněk Venera
Autor
    Ježek, Josef
    Schulmann, Karel
    Venera, Zdeněk
Jazyk
    anglicky
Zdrojový dokument - seriál
    Petrology struct. Geol.
Svazek/č.
    Vol. 8
Strany
    p. 159-176
Rok
    1997
Poznámky
    10 obr., 1 fot.
Předmětová skupina
    analýza petrotektonická
    biotit
    foliace
    goniometrie
    granit
    křemen
    lineace
    model matematický
    střih
    živce
Geografické jméno
    Francie-Alsace
Klíčové slovo
    Combined
    Emplacement
    Fabrics
    Flows
    Granite
    Linear
    Markers
    Melt
    Perpendicular
    Pure
    Qranite
    Segregation
    Shear
    Simple
Abstrakt (anglicky)
   Recent results of numerical modelling of crystallographic fabrics of biotite and feldspar found in the porphyritic granite of the borehole EPS-1 at Soultz-sous-Foret, France, are described and interpreted. Preferred orientations of biotite (001) planes and feldspar (010) and (100) cleavages, were measued by means of an optical goniometer. The poles of (001) biotites show stable orientations throughout the core with maximum eigenvector v1 oriented in the NE-SW direction. Within the subhorizontal magmatic foliation plane, also defined by feldspar (010) planes, two mutually orthogonal linear fabrics were found to be NE and NW trending, defined by the feldspar long axes. Variations in biotite fabric intensity and symmetry in deifferent sections of the vertical profile were used to determine a plausible flow geometry in these sections.
   Numerical modelling involving a component of coaxial flattening, with various amounts of extension parallel and perpendicular to stretch in addition to simple shearing, agrees qualitatively with the observed data. The models demonstrate that, under combined coaxial and simple shear flow regimes, mutually orthogonal lienar fabrics may result from progressive rotation of the shortest crystals
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    7. 12. 2007
Datum importu
    8. 8. 2012