Record details

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

   Fernández, Carlos
   Původce

   Vigneresse, Jean-Louis
   Původce
Language
    anglicky
Source title - monograph
    Understanding Granites: Integrating New and Classical Techniques, Geological society special publication, no. 168
Pages
    s. 95-110
Notes
    9 obr.
    il.
    Obsahuje bibliografické odkazy
Subject group
    geologie hlubinná
    granit
    mapa gravimetrická
    petrogeneze
    pluton
    smrčinský pluton
    vmístění
    zonálnost
Geographical name
    ČR-Čechy
    Smrčiny
    SRN-Bayern
    Španělsko-Estremadura
Keyword
    Approach
    Combining
    Data
    Emplacement
    Geochemical
    Gravity
    Implications
    Multidisciplinary
    Pluton
    Structural
    Zonation
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
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    8. 2. 2007
Import date
    8. 8. 2012