Podrobnosti záznamu

Název
    Illite/smectite diagenesis in the autochthonous Miocene claystones of the Carpathian Foredeep
Údaj o odpovědnosti
    T. Dudek
Další názvy
    15th Conference on Clay Mineralogy and Petrology, Brno, September 6-10, 1998 - Proceedings (Variant.)
Autor
    Dudek, T.
Jazyk
    anglicky
Zdrojový dokument - seriál
    Scripta facultatis scientiarum naturalium Universitatis Masarykianae brunensis. Geology
Svazek/č.
    Vol. 28-29
Strany
    p. 55-66
Rok
    1998-1999
Poznámky
    3 obr., 1 tab.
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Scr. Univ. Masaryk. brun., Geol.
Předmětová skupina
    diageneze
    illit
    jílovec
    karpatská neogenní předhlubeň
    minerály smíšených struktur
    miocén
    smektity
Geografické jméno
    Buszkowicki (Polsko-jihozápad)
    Jodlówka (Polsko-jihozápad)
    Polsko - jihozápad
    Ryszkowa Wola (Polsko-jihozápad)
    Zalazie (Polsko-jihozápad)
Klíčové slovo
    Autochthonous
    Carpathian
    Claystones
    Diagenesis
    Foredeep
    Illite/smectite
    Miocene
Abstrakt (anglicky)
   The conversion of smectite to illite has been studied by X-ray diffraction techniques in the Miocene claystones of the Carpathian Foredeep. Samples were taken from the four boreholes (Jodlówka-4, Buszkowiczki-4, Zalazie-2 and Ryszkowa Wola-7) located in the eastern part of the Polish segment of Carpathian Foredeep. The autochthonous Miocene sediments in Jodlówka-4 are buried under the 1500m thick Carpathian overthrust. The other three boreholes are situated north of the front line of the Carpathian overthrust. In three boreholes (Jodlówka-4, Buszkowiczki-4 and Zalazie-2), diagenetic evolution of illite/smectite has been observed as a general trend of decreasing % smectite (%S) in mixed-layer minerals with depth (from 70%S to 30%S), starting from a certain level (onset of illitization). In Ryszkowa Wola-7 the onset of illitization has not been observed. In Jodlówka-4 and Zalazie-2, the transition from random (RO) to ordered (R1) structures has been observed.
   The trends of illitization were correlated with present-day temperatures calculated on the basis of gamma-ray logs. Assuming that present-day geothermal gradient is similar to thermal conditions at the time of maximal burial of sediments and comparing the known temperatures of the R0/R1 transition (110-120°C) with the values estimated for the two boreholes, the erosion in the investigated region was calculated: 400-700 m for Jodlówka-4 and 500-780 m for Zalazie-2. In Jodlówka-4, the gradient of diagenesis (%S/100 m below the onset of illitization) is lower than in Buszkowiczki-4 and Zalazie-2. These differences are interpreted as related to different temperature of Miocene sediments beneath the Carpathians as compared to the parts of the basin not affected by the overthrusted cover. The temperature differences, in turn, might be due to more rapid subsidence of the Foredeep sediments beneath the Carpathians caused by load of nappes, relative to the northern parts of the basin
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    6. 3. 2008
Datum importu
    8. 8. 2012