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Middle Miocene Badenian anhydrite horizon in the Ryszkowa Wola 7 borehole (SE Polska)
Języki publikacji
Abstrakty
Badeńska sukcesja ewaporatowa w otworze Ryszkowa Wola 7 składa się z anhydrytów wykształconych w facji laminowanej oraz brekcjowej. Wartości delta 18O i delta 34S anhydrytów wskazują na morskie pochodzenie jonu siarczanowego. Zespoły otwornicowe w utworach bezpośrednio poniżej poziomu anhydrytowego, a także w obrębie najniższej części anhydrytu, świadczą o redepozycji mikrofauny.
Middle Badenian evaporites of the Carpathian Foredeep basin show a regular spacial pattern of evaporite facies: primary gypsum forming wide sulphate platform (with gypsum sections a few tens of metres thick) occurs in the most marginal, northern part of the Carpathian Foredeep. In more buried, basinward part of the Badenian evaporite basin, the place of primary gypsum is taken by anhydrite (e.g. B. Kubica, 1992) usually 10-30 m thick, and in the narrow axial part of the basin, in local salt basins, halite deposits occur. The depth in halite basins was a few hundred metres (A. Garlicki, 1979), and a part of the salt was deposited through the action of gravity currents (e.g. A. Ślączka, K. Kolasa, 1997). Siliciclastic rocks forming intercalations in halite show the facies variability and sedimentary structures characteristic of turbidites (K. Bukowski,1997). Between the marginal sulphate platform and the axial part a zone occurs where laminated sulphates with sulphate breccia and claystone intercalations occur. The Ryszkowa 7 borehole has been located in the eastern part of the Polish Carpathian Foredeep (Fig. 1). In this part of the foredeep, at the base of the Miocene sequence, thin (20-30 m) transgressive conglomerates, sandstones and claystones occur; they belong to Lower Badenian. Middle Badenian anhydrites that follow are covered by very thick (up to 2,500 m) Upper Badenian and Sarmatian claystones and sandstones (R. Ney et al., 1974). The anhydrite section consists of interbedded laminated and breccia anhydrite (Fig. 2). The anhydrite facies display features characteristic of redeposited sediments. Resedimentation is a relatively common phenomenon observed in modern evaporitic environments and the ancient evaporite sequences. The sulphate originated by precipitation at the air-water interface, with the sulphate particles settling to the bottom as a fine crystal "rain", or by precipitation from the brine body. Subsequently, it could be redeposited in relation to debris flows initiated by the earthquakes. The delta values (delta 18O: 11.26-15.15 promile, delta34S: 20.92-24.18 promile) of anhydrite are shown in Figs. 2-4. They indicate a marine origin of sulphate ion (cf. G. E. Claypool et al., 1980). It is characteristic that the general patterns of changes of delta values of Ryszkowa Wola (the central partof the Carpathian Foredeep) and Borków (the peripheral part) are very similar. Foraminiferal assemblages recorded below anhydrite and in the siliciclastic intercalation in the lowermost part of anhydrite (Pl. I-II) derive from older deposits as well as penecontemporaneous with the deposition of the oldest part of the anhydrite section. Redeposited foraminiferal assemblages related to the Wieliczka salt deposits were earlier found by E. Łuczkowska and J. Rolewicz (1990).
Czasopismo
Rocznik
Tom
Strony
61--78
Opis fizyczny
2 tabl., Bibliogr. 60 poz., rys., tab.
Twórcy
autor
autor
autor
autor
autor
- Państwowy Instytut Geologiczny, Rakowiecka 4, 00-975 Warszawa
Bibliografia
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-AGHM-0041-0007
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