Record details

Title
    Magnetic fabric and rheology of co-mingled magmas in the Nasavrky Plutonic Complex (E Bohemia): implications for intrusive strain regime and emplacement mechanism
Statement of responsibility
    František Hrouda, Štěpánka Táborská, Karel Schulmann, Josef Ježek, David Dolejš
Author
    Dolejš, David
    Hrouda, František
    Ježek, Josef
    Schulmann, Karel
    Táborská, Štěpánka
Language
    anglicky
Source title - serial
    Tectonophysics
Vol./nr.
    Vol. 307
Pages
    p. 93-111
Year
    1999
Notes
    9 obr., 3 tab., 1 pl., 3 s.bibl.
Subject group
    granitoidy
    minerály magnetické
    nasavrcký pluton
    viskozita
    vlastnosti magnetické
    vmístění
    xenolit
    železnohorské krystalinikum
Geographical name
    ČR-Čechy
    Nasavrky (Chrudim)
    Prosetín (Chrudim)
    Švihov (Chrudim)
Keyword
    Bohemia
    Co-mingled
    Complex
    Emplacement
    Fabric
    Implications
    Intrusive
    Magmas
    Magnetic
    Mechanism
    Nasavrky
    Plutonic
    Regime
    Rheology
    Strain
Abstract (in english)
   The fabrics of mafic microgranular enclaves (MME) and of the host granodiorite of the old granodiorite intrusion of the Nasavrky Plutonic Complex (E Bohemia) were investigated by means of magnetic anisotropy. The magnetic fabric in MME is orineted coaxially with the magnetic fabric in MME originated during the same process as the magnetic fabric in granodiorite, i.e. during the granodiorite emplacement. In addition, also the degree of anisotropy and the shapes of susceptibility ellipsoids are very similar in MME and in granodiorite, which probaby indicates that the MME had probably a similar viscosity to that of granodiorite and behaved as passive markers whose shapes resembled those of the intrusive strain ellipsoids. Petrological and geochemical approaches coupled with rheological modelling allow the prediction of the physical states of magmas and of the development of their internal fabrics.
   Observed fabrics were compared to the results of numerical modelling of multiparticle systems slowly moving in viscous fluid. The steep magnetic foliations and almost vertical magnetic lineations suggest that today's erosion level represents a relatively deep intrusive level where magma flowed vertically and its intrusion was controlled by the shape of the feeder zone used for magma ascension
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    28. 1. 2008
Import date
    8. 8. 2012