Podrobnosti záznamu

    Ground Geophysical and Geological Mapping in the Central Part of the Moldanubian Pluton
Údaj o odpovědnosti
    Ivan Gnojek, Antonín Přichystal
Další názvy
    Bodengeophysikalische und geologische Kartiierung im Zentralbereich des Moldanubischen Plutons
    Gnojek, Ivan
    Přichystal, Antonín, 1950-
Zdrojový dokument - seriál
    Jahrbuch der Geologischen Bundesanstalt
    Vol. 140, no. 2
    p. 193-250
    26 obr., 31 fot., 5 tab. + 1
    Anglické resumé
    Německé resumé
    Zkr. název ser.: Jb. Geol. Bundesanst. (Wien)
Předmětová skupina
    anomálie geofyzikální
    mapa geofyzikální
    mapa geologická
    měření magnetické
    měření pozemní
    měření radiometrické
    moldanubický pluton
    prvky radioaktivní
Geografické jméno
    Nová Bystřice (Jindřichův Hradec)
    Pohoří na Šumavě (Český Krumlov)
    Rapšach (Jindřichův Hradec)
    Staré Město pod Landštejnem (Jindřichův Hradec)
Klíčové slovo
Abstrakt (anglicky)
   An almost 1100 km2 large area pertaining to the Moldanubian Pluton between the towns of Freistadt (oö) and Kautzen (nö) was systematically studied by ground geophysical methods during 1991-1994. The set of methods included simultaneously applied ground magnetics, in-situ magnetic susceptibility survey and ground gamma-ray spectrometry keeping the observation point density between 8 to 10 points per 1 km2. In the same time detailed geological mapping with the view to explain some geophysical phenomena was carried out on 260 km2 large partial areas selected within the territory studied by ground geophysics. The ground magnetic revealed 1) the large Reingers anomaly in the NE Kautzen part of the area developed on both sides of the A/CZ frontier, 2) deliminated the NW continuation of the Liebenau anomaly (primarily disclosed by airborne survey) and 3) gave precision to the small-size Sandl anomaly.
   Using magnetic modelling the sizes and the position of the magnetic source-bodies in the geological cross-section were interpreted. The new geological mapping together with in-situ magnetic susceptibility survey supplied this feature of all the granite types anomaly and the eastern part of the Weitra magnetic anomaly. In the northern Reingers anomaly the geological mapping only small dykes of granite-granodiorite porphyries with anomalous high magnetic susceptibility on the surface. The source body has to be hidden at estimated depth between 300-500 m (its upper part) and 2-3 km (its bottom). New radioactive features of all rocks presented were obtained by means of a huge collection exceeding ten thousand in situ data of potassium, uranium and thorium concentrations in the granites. The magnetite comprised in the Karlstift granite in considerable contents was proved to be a product of secondary alterations.
   The alteration processes realized in the Karlstift granite also redistributed the potassium, uranium and thorium abundance both in the endo- and exocontact of this granite. Our geological mapping found also a continuati
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
Datum vložení
    21. 3. 2008
Datum importu
    8. 8. 2012