Record details

Title
    Celadonite and saponite nodules from Tertiary volcanic breccia of Račí vrch Hill, České středohoří Mts.
Statement of responsibility
    Karel Melka, Jiří K. Novák, Jaromír Ulrych, Tomáš Wiesner
    Melka K., Novák J.K., Ulrych J., Wiesner T.
Other titles
    Sixteenth Conference on Clay Mineralogy and Petrology in Karlovy Vary (Czech Republic), August 27-31, 2000 (Variant.)
Author
    Melka, Karel
    Melka, Karel, 1930-
    Novák, Jiří K.
    Novák, Jiří Karel
    Ulrych, Jaromír
    Ulrych, Jaromír, 1943-
    Wiesner, Tomáš
Language
    anglicky
Source title - serial
    Acta Universitatis Carolinae. Geologica
Vol./nr.
    Vol. 44, no. 2-4
Pages
    p. 109-116
    p. 109-116, 1 l. příl.
Year
    2000
Notes
    6 obr., 6 tab., 2 pl., 29 bibl.
    6 obr. v textu, 2 pl. v příl.
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Acta Univ. Carol., Geol.
Classfication no.
    549
    552
Conspectus category
    549
    552
Subject group
    analýza termická
    bazanit
    brekcie vulkanická
    metoda prášková
    mikroanalýza elektronová
    minerály jílové
    saponit
    seladonit
    vulkanity Českého středohoří
Geographical name
    České středohoří
    ČR-Čechy
    Krásné Březno (Ústí nad Labem)
Keyword
    Breccia
    Celadonite
    České
    Hill
    Mts
    Nodules
    Račí
    Saponite
    Středohoří
    Tertiary
    Volcanic
    Vrch
Abstract (in english)
   The composite volcanic body of Račí vrch Hill near krásné Březno, occassionally hosting green-coloured nodules, 1-7 cm in size, originated from tephra-producing eruption, and a massive basanitic neck. Compositional variations of natural celadonite and Fe-rich saponite with subordinate mixed-layer phase of the celadonite/smectite series, present in the nodules, were investigated using X-ray diffraction, electron microprobe analysis and thermal analytical methods. A pure celadonite was identified as a 1M polytype with well ordered structure. In the celadonite/smectite interstratified phase, the amount of 15 percent of expandable (smectite) layers was determined. The thermal decomposition of the sample containing saponite confirmed its trioctahedral character. The composition of secondary phyllosilicates is strongly dependent on primary mineral composition.
   The (i) spongy textured celadonite probably originated from the interaction of altered olivine, volcanic glass and clinopyroxene with autohydrothermal solutions, (ii) composition of Fe-rich saponite was controlled by volcanic glass chemistry only. In addition to these mineral phases, calcite and/or aragonite developed during the autohydrothermal stage of the rock alteration

   The composite volcanic body of Račí vrch Hill near krásné Březno, occassionally hosting green-coloured nodules, 1-7 cm in size, originated from tephra-producing eruption, and a massive basanitic neck. Compositional variations of natural celadonite and Fe-rich saponite with subordinate mixed-layer phase of the celadonite/smectite series, present in the nodules, were investigated using X-ray diffraction, electron microprobe analysis and thermal analytical methods. A pure celadonite was identified as a 1M polytype with well ordered structure. In the celadonite/smectite interstratified phase, the amount of 15 percent of expandable (smectite) layers was determined. The thermal decomposition of the sample containing saponite confirmed its trioctahedral character. The composition of secondary phyllosilicates is strongly dependent on primary mineral composition.
   The (i) spongy textured celadonite probably originated from the interaction of altered olivine, volcanic glass and clinopyroxene with autohydrothermal solutions, (ii) composition of Fe-rich saponite was controlled by volcanic glass chemistry only. In addition to these mineral phases, calcite and/or aragonite developed during the autohydrothermal stage of the rock alteration
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    21. 3. 2008
    16. 4. 2008
Import date
    8. 8. 2012