Record details

    A multidisciplinary approach combining geochemical gravity and structural data: implications for pluton emplacement and zonation
Statement of responsibility
    L. Hecht, Jean Louis Vigneresse
    Hecht, Lutz
    Vigneresse, Jean-Louis
    Modern and Classical Techniques in Granite Studies (1997 : Huelva, Španělsko)
Other author; role
   Castro, Antonio

   Fernández, Carlos

   Vigneresse, Jean-Louis
Source title - monograph
    Understanding Granites: Integrating New and Classical Techniques, Geological society special publication, no. 168
    s. 95-110
    9 obr.
    Obsahuje bibliografické odkazy
Subject group
    geologie hlubinná
    mapa gravimetrická
    smrčinský pluton
Geographical name
Abstract (in english)
   Granitic pluton emplacement and zonation are controlled, among others, by regional deformation and the rate of magma supply. The latter has consequences for the disposition of successively emplaced, more chemically evolved, batches of magma. Our general interpretation is based on a multidisciplinary approach combining field observations, gravity data, internal structures and geochemical variations. Magma feeders are identified in the plutons as the deepest zones, inferred from gravity measurements, when they also correspond to vertical lineations. Correlation of the root location with compositional zoning indicate how the magma evolved during emplacement. Two case studies of Hercynian granite plutons illustrate the interpretations: the normally zoned Cabeza de Araya pluton (Spain), and the multiphase Fichtelgebirge pluton (Germany) which displays both normal and reverse zoning.
   It is proposed that reverse zoning reflects discontinuous magma injection due to a tectonic rate slower than the rate of magma supply. Conversely, normal zoning can occur when magma injection is continuous in time, with successive magma batches entering within not yet crystallized magma. The two case studies illustrate how the understanding of compositional zoning and emplacement of granitic plutons can be improved by multidisciplinary approaches combining classical and modern techniques
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    8. 2. 2007
Import date
    8. 8. 2012