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- W1933290147 abstract "Na podstawie wynikow wcześniejszych badan stratygraficznych dokonano korelacji utworow gornodewonskich rejonu Debnika oraz obszaru olkusko-zawiercianskiego. Rekonstrukcje facjalne i paleogeograficzne potwierdzily pogląd o ogolnym splycaniu sie zbiornika ku poludniowi. Analizowane sekwencje reprezentują dwa cykle sedymentacyjne rozwiniete w sposob typowy dla szelfow weglanowych. Dwa epizody transgresywne we wczesnym i poźnym franie byly stosunkowo raptowne i silne. Etapy regresywne charakteryzowaly sie stopniowym, choc przejściowo przyspieszanym, splycaniem zbiornika i progradacją przybrzeznej platformy weglanowej ku polnocy. Szczegolnie silnie zaznaczylo sie to w mlodszym famenie w rozwoju kompleksu barierowego w okolicach Debnika. CORRELATION AND SEDIMENTARY DEVELOPMENT OF THE UPPER DEVONIAN BETWEEN DĘBNIK AND ZAWIERCIE IN SOUTHERN POLAND Earlier stratigraphic analyses (M. Narkiewicz, 1978a; M. Narkiewicz, G. Racki, 1984) made it possible to correlate the Upper Devonian shelf carbonates across the transect perpendicular to the presumed southern margin of the epicontinental basin in southern Poland (Fig. 1). Only two Frasnian lithostratigraphic units correlate directly between the two analysed regions: the Nodular Limestone and the Calcirudites (Fig. 2). Other units have more a local extension reflecting lateral facies variability. Present study confirms the earlier hypothesis assuming a general shallowing of sedimentary environments to the south. Shoreward changes in litho·and biofacies may be explained in terms of a gradual increase in energy in progressively shallower environment, and parallel increase in oxygen content, i.c. change from anaerobic to aerobic conditions (according to the model by C. W. Byers, 1977). Vertical facies sequence consists of two major shallowing·upward cycles (Figs 3-4). They start with relatively rapid transgressions in the Lower asymmetricus Zone and the Lower (Upper?) gigas Zone, respectively. Regressive trends were developing in much lower rates and may have been can trolled by a gradual basin infilling under conditions of a relative stillstand of the sea Ievel. In both cycles, however, slow regressions were interrupted by the rapid regressive pulses in the Lower gigas Zone and in the (Middle?) crepida Zone, respectively. During regressions the attached carbonate platforms were prograding northwards over basinal marly facies (see M. Narkiewicz. G. Racki, 1985). In the Frasnian times the platform was probably represented by a coral·stromatoporoid biostromal complex, while in the Famennian a shoal-rimmed structure developed, with sandy bariers and stromatoporoid patch reefs protecting broad peritidal facies belt." @default.
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- W1933290147 date "2013-04-24" @default.
- W1933290147 modified "2023-09-23" @default.
- W1933290147 title "Korelacja i rozwój sedymentacji górnego dewonu między Dębnikiem a Zawierciem" @default.
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