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Sedimentary history and biota of the Zechstein Limestone (Permian, Wuchiapingian) of the Jabłonna Reef in Western Poland

Peryt T. M., Raczyński P., Peryt D., Chłódek K., Mikołajewski K.

Annales Societatis Geologorum Poloniae

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2016

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Vol. 86, No. 4

379--413

EN

The Jabłonna Reef, one of the reefs formed in Wuchiapingian time in the western part of the Wolsztyn palaeo-High (SW Poland), is characterized by quite irregular outlines and consists of three separate reef bodies (ca. 0.5–1.5 km2 each; the thickness of the reef complex is usually >60 m). It is penetrated by four boreholes, which show two distinct phases of bryozoan reef development during deposition of the the Zechstein Limestone. The first one occurred early in the depositional history and botryoidal aragonitic cementation played a very important role in reef formation. This phase of bryozoan reef development terminated suddenly; one possible reason was that a relative change of sea level – first a fall and then a rise – disturbed the upwelling circulation. Consequently, bioclastic deposition predominated for a relatively long time until the second phase of bryozoan reef development occurred, but the latter was not accompanied by dubious early cementation. During this second phase, reticular fenestellid bryozoans were predominant. Subsequently, microbial reefs developed and abound in the upper part of the Zechstein Limestone sections. The general shallowing-upward nature of deposition in the Jab³onna Reef area resulted in reef-flat conditions with ubiquitous, microbial deposits, in the central part of the Jab³onna Reef. Then, the reef-flat started to prograde and eventually the entire Jab³onna Reef area became the site of very shallow, subaqueous deposition. Five biofacies are distinguished in the Jab³onna Reef sections: the Acanthocladia biofacies at the base, then mollusc-crinoid, brachiopod-bryozoan, Rectifenestella and at the top, stromatolite biofacies. They represent a shallowing-upward cycle, possibly with some important fluctuation recorded as the distinctive lithofacies boundary, corresponding to the Acanthocladia/mollusc-crinoid biofacies boundary. The 13C curves of the Jab³onna 2 and Jab³onna 4 boreholes permit correlation of the trends in the middle parts of both sections and confirm the strong diachroneity of the biofacies boundaries, with the exception of the roughly isochronous Acanthocladia/ mollusc-crinoid biofacies boundary. The presence of echinoderms and strophomenid brachiopods indicates that until deposition of the lower part of the Rectifenestella biofacies, conditions were clearly stenohaline. The subsequent elimination of stenohaline organisms and progressively poorer taxonomic differentiation of the faunal assemblage are characteristic for a slight, gradual rise in salinity. The taxonomic composition of organisms forming the Jab³onna Reef shows a similarity to reefs described from England and Germany, as well as the marginal carbonate platform of SW Poland. Filled fissures were recorded in the lower part of the Jabłonna Reef. The aragonite cementation recorded in some fissure fillings implies that they originated in rocks exposed on the sea floor and are neptunian dykes.

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Foraminiferal colonization related to the Zechstein (Lopingian) transgression in the western part of the Wolsztyn Palaeo-Ridge area, Western Poland

Peryt D., Peryt T. M., Raczyński P., Chłódek K.

Geological Quarterly

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2012

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Vol. 56, No 3

529--546

EN

The basal Zechstein succession in SW Poland is dominated by breccias and/or conglomerates or extraclast-bearing bioclastic limestones, which were deposited during rapid flooding of the pre-existing intracontinental basin in the early Lopingian (Late Permian). Of these, the boulder-cobble breccias and conglomerates are interpreted as deposited in a rocky shore-zone where density flows and upwelling prevailed. The breccias gradually pass up into bryozoan (or other bioclastics) grainstones. The matrix-supported breccias were deposited as large extraclasts and blocks of Carboniferous rock were rolled down or detached from a cliff and were then either embedded into a carbonate sand or formed a framework supplying voids that could be colonized by tubular encrusting foraminifers. These foraminifers abound in all basal Zechstein facies (except in the debris-flow deposits) and are attributed to Palaeonubecularia. The associated faunas include other foraminifers (uniserial and hemigordiopsids), bryozoans, brachiopods, bivalves, gastropods, and microbial deposits. The prolific growth of tubular encrusting foraminifers has resulted from nutrient supply from the basin by upwelling. Botryoidal aragonite cements (also interpreted as due to upwelling) also characterize the basal Zechstein strata, although they were previously reported only from the upper Zechstein Limestone. The ẟI3C values of the basal Zechstein deposits show small variation and oscillated around 4.0%o, suggesting that these deposits are younger than the Kupferschiefer.

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Ocena anizotropii skał na podstawie badań laboratoryjnych, danych z profilowań geofizycznych i pomiarów sejsmicznych z rejonu Czarna Wieś – Paproć - Cicha Góra

Kozłowski M., Wolański K., Buniak A., Jakubowska K., Chłódek K., Zalewska J., Patan K.

Prace Instytutu Nafty i Gazu

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2008

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nr 150 wydanie konferencyjne

485--490

PL

W pracy przedstawiono wyniki modelowania anizotropii ośrodka skalnego na podstawie integracji pomiarów otworowych (Upadomierz, Full Wave Sonic, Pionowe Profilowanie Sejsmiczne), atrybutów sejsmicznych i pomiarów laboratoryjnych (analizy mineralogiczne, porozymetryczne, elektryczne, spektrometryczne i m.in. z zastosowaniem jądrowego rezonansu magnetycznego) w celu identyfikacji kryteriów niezbędnych do oceny anizotropii. Badania kierunków transportu oraz sekwencji osadowych na rdzeniach wiertniczych oraz na danych z upadomierza pozwoliły na wyodrębnienie 4 sekwencji osadowych, w których począwszy od najstarszej deponowane były stożki aluwialne, następnie osady eoliczne przykryte później kolejną sekwencją stożków aluwialnych, by w czwartym najmłodszym cyklu ustąpić osadom eolicznym.

EN

The study presents results of rock medium anisotropy modelling on the grounds of well logs integration (inclinometer, Full Wave Sonic, Vertical Seismic Logging), seismic attributes and laboratory measurements (mineralogy, porosimetry, electrical, spectrometric analyses, and, among others, with use of Nuclear Magnetic Resonance) aimed at identification of criteria necessary for anisotropy assessment. Research of transport directions as well as sedimentary sequences on drilling, cores and based on inclinometer data, allowed for isolation of 4 sedimentary sequences in which detrital fans, then eolian sediments covered in turn with subsequent sequence of detrital fans have been deposited starting from the oldest one, in order to be conceded in favour of eolian sediments in the fourth, youngest cycle.

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Ocena anizotropii skał, na podstawie badań laboratoryjnych, danych z profilowań geofizycznych i pomiarów sejsmicznych z rejonu Czarna Wieś – Paproć – Cicha Góra

Kozłowski M., Wolański K., Buniak A., Jakubowska K., Chłódek K., Zalewska J., Patan K.

Nafta-Gaz

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2008

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R. 64, nr 10

672-682

PL

W artykule przedstawiono wyniki modelowania anizotropii ośrodka skalnego na podstawie integracji pomiarów otworowych (Upadomierz, Full Wave Sonic, Pionowe Profilowanie Sejsmiczne), atrybutów sejsmicznych i pomiarów laboratoryjnych (analizy mineralogiczne, porozymetryczne, elektryczne, spektrometryczne i m.in. z zastosowaniem jądrowego rezonansu magnetycznego), w celu identyfikacji kryteriów niezbędnych do oceny anizotropii. Badania kierunków transportu oraz sekwencji osadowych na rdzeniach wiertniczych oraz na danych z upadomierza pozwoliły na wyodrębnienie 4 sekwencji osadowych, w których począwszy od najstarszej deponowane były stożki aluwialne, następnie osady eoliczne – przykryte później kolejną sekwencją stożków aluwialnych, by w czwartym, najmłodszym cyklu, ustąpić osadom eolicznym.

EN

The study presents results of rock medium anisotropy modelling on the grounds of well logs integration (inclinometer, Full Wave Sonic, Vertical Seismic Logging), seismic attributes and laboratory measurements (mineralogy, porosimetry, electrical, spectrometric analyses, and, among others, with use of Nuclear Magnetic Resonance) aimed at identification of criteria necessary for anisotropy assessment. Research of transport directions as well as sedimentary sequences on drilling cores and based on inclinometer data, allowed for isolation of 4 sedimentary sequences in which detrital fans, then eolian sediments covered in turn with subsequent sequence of detrital fans have been deposited starting from the oldest one, in order to be conceded in favour of eolian sediments in the fourth, youngest cycle.