Nowe znaleziska paleozoicznych węglanowych skał egzotycznych we fliszu polskich Karpat zewnętrznych

Jadwiga Burtan, Jan Golonka, Anna Tomaś, Roman Zająć


Analiza mikrofacjalna węglanowych egzotyków paleozoicznych, znalezionych w jednostkach śląskiej i podśląskiej, wykazała obecność biogenicznych skal wapiennych i dolomitycznych dewonu środko­wego i górnego oraz karbonu dolnego.


New finds of Paleozoic carbonate exotics are reported from the Subsilesian and Silesian units in the Polish Flysch Carpathians (Fig. 1). Carbonate exotics represent: I - organogenic limestones of the bioherm type, 2 - oncoid-pelloid limestones of the bahamite type, and 3 - organodetrital limestones (biomicrites and biosparites), ranging in age from the Middle Devonian to Lower Carboniferous (higher Visean, V2–V3).

Exotics of organogenic limestones were found at Wiśniowa (Subsilesian Unit) and Skrzydlna and Trzemeśnia (Silesian Unit). Stromatoporoids arc the major rock-forming components here, being accompanied by algae, charae, calcispherae, primitive foraminifers, sponge spicules, brachiopods, gastropods, ostracodes, crinoids and echinoid spines. Limestones from Wiśniowa and Skrzydlna display advanced silification. Microfacies nature and the recorded stromatoporoids make possible dating these organogenic limestones at the Middle-Upper Devonian and suggest their origin in water environment of high energy.

The bahamite type limestone from Czarna Wisełka (Silesian Unit) is built of microoncoids, intraclasts, aggregational grains, pelloids, detrital quartz as well as organic n mains, sometimes displaying micritic coatings. The organic assemblage is here represented by algae, calcispherae, primitive foraminifers and fragments of brachiopods. Limestones of such type were originating in highly turbulent waters but less turbulent than in the case of bioherm sediment.

Exotics from Sułów and Kobylec - Łapanów (Silesian Unit) and Księża Góra (Subsilesian Unit) represent organodetrital limestones (biomicrites and biosparites). The Sułów exotic is a brachiopod-foraminifer biosparite, these from Księża Góra - foraminifer biosparite and algal biomicrite, and that from Kobylec-Łapanów - clay biomicrite, yielding algal-calcispheral-foraminiferal assemblage. Foraminifers found in exotics from Sułów, Księża Góra and Kobylec - Łapanów make it possible to date them at higher Visean (V2-V3). The limestones originated in shallow, medium-to low-energy marine environment of a shallow shelf or a zone protected from wave action (back reef).

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