Record details

Title
    Petrophysical and geochemical constraints on alteration processes in granites
Author
    Janoušek, V.
    Machek, Matěj
    Petrovský, Eduard
    René, Miloš
    Roxerová, Zuzana
    Staněk, Martin
Language
    anglicky
Publication type
    článek v odborném periodiku
Source title - serial
    Studia geophysica et geodaetica
Vol./nr.
    Roč. 57, č. 4
Pages
    s. 710-740
Year
    2013
Notes
    Projekt: GA205/09/0540, GA ČR3cav_un_auth*0253156
    Projekt: PTDC/CTE-GIX/098696/2008, FCT, PT3cav_un_auth*0302127
    Rozsah: 31 s. : P
Subject category
    anisotropy of magnetic susceptibility
    feldspathization
    greisenization
    porosity
Keyword
    Alteration
    Constraints
    Geochemical
    Granites
    Petrophysical
    Processes
Abstract (in english)
   The hydrothermal alteration of granites has large influence on their petrophysical properties. To reveal the impact of alteration on magnetic and porosity properties of granites we have conducted a complex study of effects of two largely independent alteration processes, related to chemically different fluids, in granites of the Vysoký Kámen stock (the Krudum granite body, Czech Republic). It includes the whole-rock geochemical, magnetic and pore-space characterization. The alkali feldspathization resulted in decomposition of Li-mica, quartz removal, depletion in mafic cations and growth of new alkali feldspars (albite, K feldspar), decreasing the overall magnetic susceptibility and disrupting the pore space by its discontinuation. The preservation of the orientation of the principal susceptibility axes is likely related with insignificant influence of the feldspathization process on the paramagnetic and diamagnetic phases orientation acquired during the magma emplacement.
Contributor
    AV ČR Brno, Ústav struktury minerálů a hornin
Contributor code
    AV ČR, ÚSMH
Source format
    U
Import date
    24. 10. 2014