Record details

Title
    On the interpretation of normal and inverse magnetic fabric in dikes: Examples from the Eger Graben, NW Bohemian Massif
Other titles
    K interpretaci narmální a inverzní magnetické stavby v žilách: příklady z oháreckého riftu, Český masiv
Author
    Cajz, Vladimír
    Chadima, Martin
    Týcová, Patricie
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Tectonophysics
Vol./nr.
    Roč. 466, č. 1-2
Pages
    17
Year
    2009
Thesaurus term
    Anisotropy of magnetic susceptibility Anisotropy of magnetic remanence Lattice preferred orientation Sanidine EBSD Multi-function Kappabridge
Keyword
    Bohemian
    Dikes
    Eger
    Examples
    Fabric
    Graben
    Interpretation
    Inverse
    Magnetic
    Massif
    Normal
    NW
Abstract (in czech)
   Na studiu vybraných žil oháreckého riftu byly studovány magnetické stavby a orientace a vlastnosti magnetických minerálů v různých typech žilných hornin v závislosti na jejich normálním/inversním charakteru. Byly diskutovány odlišné mechanismy tvorby magnetických staveb z hlediska AMS a AMR.
Abstract (in english)
   We studied magnetic fabric of selected dikes associated with the SW-NE trending Eger Graben (NW Bohemian Massif). Magnetic susceptibility varies according to rock type and reflects the relative contents of magnetic minerals. Several different types of magnetic fabric were observed in studied dikes: so-called normal and inverse magnetic fabrics and anomalous magnetic fabric. Anisotropy of anhysteretic remanent magnetization (AMR) indicate that the observed inverse magnetic fabric may be caused by the presence of SD magnetic grains; AMR fabric being normal with respect to dike margins. In contrast to that no single-domain particles were revealed using frequency dependence and anhysteretic susceptibility measurements. For further flow direction and tectonic interpretations of magnetic fabric in dikes it is suggested to use preferably the AMR fabric (at least for dikes which demonstrate significant field dependence of AMS) as it reflects the true rock fabric more accurately than AMS fabric
   .
Contributor
    Česká geologická služba
Contributor code
    ČGS (RIV)
Source format
    R
Import date
    15. 10. 2014