Record details

Title
    Petrogeneza marmurów z poludniowo-wschodniej czesci metamorfiku Snieznika (Sudety)
Statement of responsibility
    Stanislaw Koszela
Other titles
    Petrogenesis of marbles from the south-eastern part of Sneznik Metamorphic Massif (Sudetes)
Author
    Koszela, Stanislaw
Language
    polsky
Source title - serial
    Geologia sudetica
Vol./nr.
    Roč. 30
Pages
    s. 59-115
Year
    1997
Notes
    9 obr., 7 pl., 6 s.bibl.
    Anglické resumé
    Zkr. název ser.: Geol. sudetica.
Subject group
    diageneze
    facie amfibolitová
    geologie strukturní
    metamorfóza
    mramor
    orlicko-sněžnické krystalinikum
    podmínky P-T
    relikt
    sedimenty karbonátové
    textury sedimentů
Geographical name
    ČR-Morava
    Jeseníky
    Polsko - jihozápad
    Staré Město (Šumperk)
Keyword
    Czesci
    Marmurów
    Metamorfiku
    Petrogeneza
    Poludniowo-wschodniej
    Snieznika
    Sudety
Abstract (in english)
   1. The carbonate rocks of the Stronie Formation occur as assemblages of several separate bodies outcropping along the distance of a few kilometres. Individual bodies are some tens of metres thick and up to several hundreds of metres long lenses. Their relationship to country rocks is of primary, sedimentary character. 2. Eight lithotypes ranging from calcite marbles to carbonate-silicate rocks have been discerned. 3. The carbonate rocks are spatially associated with metavolcanic rocks. Close to the latter, the silicate rocks containing carbonate lithotypes prevail, whereas marbles occur at the top of carbonate rocks profiles. 4. Carbonate rocks contain scarce relics of sedimentary structures such as bedding, lamination and sedimentary flows(?). Also calcite relicts of fauna skeletons have been recognized, which points to Palaeozoic age and biogenic origin of the studied rocks.
   The carbonates were likely deposites in shallow marine environment rather remote from continental margin, in the area of active volcanism. 5. Dolomitization of Stronie carbonate rocks was probably of diagenetic type. Three sources of Mg ions and respective dolomitization mechanisms have been distinguished: - neomorphic changes of Mg-calcite biogenic structures; - diagenetic transformations of clay minerals (illite); - migration of solutions with increased contents of Mg-ions. 6. Mineral assemblages of the carbonate rocks point to the metamorhism in the upper (clinopyroxene) and lower amphibolite facies at high fluid pressure of CO2. Minimum temperature of these transformations calculated with calcite-dolomite geothermometer is ca 500°C at assumed P of 5 kbar. Three generations of fluid inclusions found in the carbonates are probably connected: 1) with metamorphism under lower amphibolite facies conditions (maximum at ca.
   530°C), 2) with retrogressive transformations in albite-epidote-amphibolite facies (max. at ca 400-450°C), and 3) with hydrothermal phenomena (max. at ca 210-240°C)
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    31. 3. 2008
Import date
    8. 8. 2012