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LITHOLOGY AND MORPHOLOGY OF UPPER JURASSIC CARBONATE BUILDUPS IN THE BĘDKOWSKA VALLEY, KRAKÓW REGION, SOUTHERN POLAND Marcin KRAJEWSKI University of Mining and Metallurgy; Faculty of Geology, Geophysics and Ervironmental Protection, al. Mickiewicza 30; 30-059 Kraków, Poland; e-mail: kramar@geolog.geol.agh.edu.pl Krajewski, M., 2000. Lithology and morphology of Upper Jurassic
carbonate buildups in the Będkowska Valley, Kraków region, Southern
Poland. Annales Societatis Geologorum Poloniae, 70: 151-163. Key words: carbonate buildups, microfacies, Upper Jurassic, Kraków region, Southern Poland. |
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| Abstract: Upper Jurassic
limestones exposed in the Będkowska Valley form an extensive complex of
carbonate buildups of microbolite-sponge and microbolite-Tubiphytes reef-like
bioherms, in which the main rock-building material are packstone and grainstone
bound by microbolite structures. Horizontal discontinuity surfaces locally
found in massive limestones are of sedimentary origin and are related to
sediment gravity flows from the higher parts of the buildups. Two basic morphological types of carbonate buildups are distinguished in the vertical sequence of studied sediments: (i) one or a couple of large buildups forming a continuous biolitite cover with one type of sediment prevailing over a wide area in the lower part and passing upwards to (ii) numerous small buildups separated by depressions filled with packstone and grainstone formed from erosion of the buildups. The smaller, younger buildups were subject to early cementation which led to formation of extensive constructions. |
Abstrakt: Górnojurajskie wapienie Doliny Będkowskiej tworzą
rozległy kompleks budowli węglanowych typu bioherm mikrobolitowo-gąbkowych
i mikrobolitowo-Tubiphytesowych bioherm rafopodobnych, w których podstawową
rolę skałotwórczą odgrywają ziarnity wiązane przez struktury mikrobolitowe.
Poziome powierzchnie nieciągłości obserwowane niekiedy w wapieniach
masywnych posiadają genezę sedymentacyjną związaną z drobnodetrytycznymi
spływami z wyższych partii budowli. |
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