Podrobnosti záznamu

Název
    Mixed-layer crystal structures of the hydrobiotite type in tuffs of the Doupovské hory Mts. region
Údaj o odpovědnosti
    Karel Melka, Marie Adamová, Irena Haladová
Další názvy
    15th Conference on Clay Mineralogy and Petrology, Brno, September 6-10, 1998 - Proceedings (Variant.)
Autor
    Adamová, Marie
    Haladová, Irena
    Melka, Karel
Jazyk
    anglicky
Zdrojový dokument - seriál
    Scripta facultatis scientiarum naturalium Universitatis Masarykianae brunensis. Geology
Svazek/č.
    Vol. 28-29
Strany
    p. 7-18
Rok
    1998-1999
Poznámky
    7 obr., 3 tab.
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Scr. Univ. Masaryk. brun., Geol.
Předmětová skupina
    flogopit
    hydrobiotit
    krystalová struktura
    metoda prášková
    minerály smíšených struktur
    smektity
    tuf
    vulkanity Doupovských hor
Geografické jméno
    ČR-Čechy
    Doupovské hory
Klíčové slovo
    Crystal
    Doupovské
    Hory
    Hydrobiotite
    Mixed-layer
    Mts
    Region
    Structures
    Tuffs
    Type
Abstrakt (anglicky)
   Mineralogical investigation of mica flakes occurring in tuffs of the Doupovské hory Mts. was carried out as a part of a regional study on volcaniclastic rocks. The volcanic area of the Doupovské hory Mts. belongs to the extensive Ohře Rift originated in Early Cenozoic time. The phlogopite-bearing tuff, green-grey in colour, was collected from an outcrop at Oleška near Doupov. Based on geochemical criteria, the volcaniclastic rock studied contains some tephra clasts derived from alkali basalt-basanite rocks. Analyses of separated mica flakes, several millimetres in size, demonstrated a reduced amount of K2O and increased amount of H2O in contrast to fresh mica. It is consistent with the chemical composition of hydrobiotites. The X-ray diffractograms gave mean basal spacing d001 with the value of 24.51˝0.51 A, calculated of tweleve 00l basal diffraction.
   Low angle diffraction confirms the presence of the regular mixed-layer structure, 1:1 interstratification of phlogopite and vermiculite layers is supposed. Hydrobiotite as a specific mineral name is reserved for such crystal structure. X-ray powder identification confirmed the existence of the mineral of hydrobiotite type as well as the presence of phlogopite, smectite, and kaolinite. Compositional study of separated mica flakes exhibition continuous phlogopite-hydrobiotite-smectite transitions in them
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    6. 3. 2008
Datum importu
    8. 8. 2012