Podrobnosti záznamu

    Klasifikace a názvosloví sedimentů - patnáct let poté
Údaj o odpovědnosti
    Zdeněk Kukal
Další názvy
    The classification and terminology of sediments - fifteen years after
    Seminář "Klasifikace magmatických, sedimentárních a metamorfovaných hornin" 9. prosince 1999 - Sborník referátů (Variant.)
    Kukal, Zdeněk, 1932-
Zdrojový dokument - seriál
    Scripta facultatis scientiarum naturalium Universitatis Masarykianae brunensis. Geology
    Roč. 27
    s. 21-30
    4 tab.
    Anglické resumé
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Scr. Univ. Masaryk. brun., Geol.
Předmětová skupina
    Český masiv
    horniny sedimentární
    mezinárodní spolupráce
    sedimenty jílovité
    sedimenty klastické
Geografické jméno
    Česká republika
Klíčové slovo
Abstrakt (anglicky)
   Czech sediment classification and nomenclature have been developed fifteen years ago and are used in almost all the publications and reports written in Czech language. There is, however, common trend to publish important papers in English in foreigh periodicals or in some prestigious Czech journals. That is why the interest in the Czech sediment terminology decreased during last years. Nevertheless, some problems still persist. They do not concern a general classification system, but some particular questions. Most important of them are discussed in this paper and their solution proposed. They can be briefly characterized as follows: 1) The boundaries between sediment types in two- and three-component systems are purely formal and often do not correspond to the natural distribution of components. Even though we have some data from the Bohemian Massif, much global data are necessary.
   2) The conglomerates should be, according to their clasts content, subdivided into quartzose (less than 3% of unstable clasts), oligomictic (between 3 and 10% of unstables) and petromictic (more than 10% of unstables). 3) For sanstones, adapted Pettijohn's classification is used and subdivision into quartzzose sandstones, arcoses, greywackes, subarcoses and subgreywackes applied. Widely used "index method" for sandstone identification is recommended but cannot completely substitute the classical terms. 4) A clayey shale differs from a claystone by the intensity of matrix recryystallization and identification should be made by microscopic investigation. Fissility is smetimes used as a criterion, but this is completely wrong. 5) Objective descriptive sediments names must not be mixed with subjective genetic terms, i.e. turbidite, calcrete and many other. 6) The usage of international terms, as clast, diamictite, mixtite, etc is recomm
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
Datum vložení
    31. 3. 2008
Datum importu
    8. 8. 2012