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EN
The Štramberk Limestone (Tithonian–lower Berriasian) was developed on a northerly located, isolated intra-Tethyan carbonate platform. It is composed of various facies that can be observed in olistoliths and blocks embedded in the Cretaceous flysch of the Outer Carpathians in Moravia (Czech Republic). Corals, microbialites, microencrusters and synsedimentary cements contributed on various scales to the reef framework. The importance of corals and some microencrusters to the formation of the Štramberk reef complex is well recognized, while other components received less attention in previous studies. Two end members of boundstone types are described from the Kotouč Quarry, near Štramberk. Boundstone type A is dominated by phaceloid (branching-type) corals, encrusted by microbialites and microencrusters, in particular photophile species (“Lithocodium-Bacinella”, Koskinobullina socialis Cherchi et Schroeder, Iberopora bodeuri Granier et Berthou). Boundstone type B is composed of microencrusters, microbialites and synsedimentary isopachous fibrous cements, while corals are absent or subordinate. Microencrusters [Crescentiella morronensis (Crescenti), Labes atramentosa Eliášová, Perturbatacrusta leini Schlagintweit et Gawlick, Radiomura cautica Senowbari-Daryan et Schäfer, thin encrusting calcified sponges] are main biotic components of the microencruster-cement boundstone. Some identified microencrusters are known only or mostly from intra-Tethyan carbonate platforms. Except for C. morronensis, other common microencrusters in the coral-microbial boundstone (type A) are rare in the microencruster-cement boundstone (type B). The depositional setting of boundstone type A corresponds to a low-energy environment of an inner platform. Boundstone type B, until now not recognized in the Štramberk Limestone, was developed in a high-energy, upper fore-reef slope environment. Other important facies in the Kotouč Quarry are reef-derived breccias: matrix-supported breccia and clast-supported breccia with radiaxial-fibrous cement (showing some similarities to Triassic “evinosponges” cement), interpreted as being dominantly synsedimentary (pre-burial). The preliminary studies by the present authors, supported by observations under cathodoluminescence, highlight the significance of synsedimentary cementation for the formation of a boundstone framework (type B) and the stabilization of fore-reef, slope deposits.
EN
Recent discoveries of ammonites in the Štramberk Limestone in the type area of their occurrence near the town of Štramberk supplement existing data on the Tithonian age of the limestones. Franconites cf. fascipartitus occurs in the lower part of the Lower Tithonian (Neochetoceras mucronatum Zone). Lemencia ciliata has a zonal character in the upper part of the Lower Tithonian. Richterella richteri is a subzonal species of the upper part of the Lower Tithonian in the Mediterranean and Submediterranean areas (Semiformiceras fallauxi Zone). All of the new discoveries are referable to the faunal associations of the Submediterranean bioprovince, and are in agreement with existing knowledge of it. Sexual dimorphism was seen in the genus Richterella, with the recognition of both macroconchs and microconchs in the type species of Richterella, i.e. R. richteri. The stratigraphic position of these recent ammonite discoveries in the Štramberk Limestone at the Kotouč Quarry does not support the stratigraphy of the limestones based on the distribution of calpionellids, as previously assumed by other authors. The recent collection of ammonites confirms that the Štramberk Limestone belongs to the lower Tithonian and lower Berriasian and also represents the lower Tithonian as a shallow-water facies.
EN
Over 100 ammonites were collected from a block of bedded shallow-water Štramberk Limestone at a new location at the Kotouč Quarry, near Štramberk (Silesian Unit, Czech Republic). Berriaselline neocomitids, including Berriasella jacobi, B. oppeli, Tirnovella allobrogensis, T. cf. allobrogensis, Delphinella consanguinea, Pseudosubplanites cf. grandis and Malbosiceras cf. asper, are the most abundant species in this ammonite association. The olcostephanitid, Spiticeras blancheti, is rare. The index species for the Early Berriasian, B. jacobi, occurs in large numbers. On the basis of the present study, the upper boundary of the stratigraphic range of the Štramberk Limestone in the type area is dated as early Berriasian (ammonite Berriasella jacobi Zone). Ammonites with ages younger than early Berriasian have never been found in the Štramberk area. The deposition of the Štramberk Limestone in the Štramberk area came to an end during that period.
EN
The proto-Silesian Basin was well developed within the Alpine Tethys during the Late Jurassic times and existed as undivided entity until the significant Late Cretaceous reorganization. The deposits originated within this basin were incorporated into different structural units: Silesian, Subsilesian and Skole. The calciturbiditic Cieszyn Limestone Formation is the oldest Cretaceous flischoidal sequence of the proto-Silesian Basin. This calciturbiditic sedimentation passed gradually into younger siliciclastic deposition.
EN
Sedimentological development of the Verovice Formation (Czech Moravia) is presented, according to Early Cretaceous geotectonic-eustatic changes in the proto-Silesian Basin. Those processes were a consequence of a gradual rebuilding the architecture of the Alpine-Carpathian realm. The geological events well correspond with the global sequence stratigraphy.
PL
Górnojurajsko-dolnokredowe utwory wchodzą obecnie w skład płaszczowin zewnętrzno-karpackich: magurskiej, śląskiej i podśląsko-żdanicko-waschbergskiej oraz znane są z olistolitów występujących w osadach różnych jednostek Karpat zewnętrznych. Autorzy podjęli próbę usystematyzowania jednostek litostratygraficznych według ich występowania w pierwotnych basenach i innych obszarach sedymentacyjnych. Basen magurski uformował się w jurze środkowej, a seweryńsko-mołdawidzki (protośląski) w późnej jurze i wczesnej kredzie z osadami synryftowymi i postryftowymi. Podśląsko-żdanicki obszar sedymentacyjny uformował się w późnej kredzie, w jurze i wczesnej kredzie wchodził w skład basenu protośląskiego, jako jego część północna. Obszarem źródłowym dla olistolitów były osady północnego skłonu i strefy szelfowej basenu protośląskiego oraz wypiętrzeń śródbasenowych.
EN
Upper Jurassic-Lower Cretaceous deposits are part of the Outer Carpathians nappes: Magura, Silesian and Sub-Silesian-Żdanice-Waschberg, and are known in olistholites, which occur within different units of the Outer Carpathians. Authors systematized lithostratigraphical units according to their primary position in sedimentary basins and other sedimentary areas. Magura Basin originated in Middle Jurassic and proto-Silesian Basin in Late Jurassic-Early Cretaceous times together with syn- and post-rift deposits. Sub-Silesian-Żdanice sedimentary area originated in Late Cretaceous, and during Jurassic and Early Cretaceous times was northern part of the proto-Silesian Basin. The source areas for olistholites have been northern slope and shelf of the proto-Silesian Basin and submerged intra-oceanic ridges (cordilleras).
PL
Przedmiotem rozważań przedstawionego artykułu jest analiza możliwości odnalezienia górnojurajsko-dolnokredowych skał macierzystych w zachodniej części Karpat fliszowych, na terenie Polski i Republiki Czeskiej. Górnojurajskie margle mikułowskie stanowią skały macierzyste światowej klasy. Te bogate w substancję organiczną skały z TOC 0.2-10% zasilały ropy naftowe w basenie wiedeńskim i pod nasunięciem karpackim w Czechach i Austrii. Podobne skały macierzyste prawdopodobnie występują w głębokich strefach pod nasunięciem w Polsce. Utwory formacji wędryńskiej i grodziskiej nie zawierają większych ilości węgla organicznego. Większą zawartość TOC stwierdzono natomiast w formacji wierzowskiej i najwyższej części formacji grodziskiej. Utwory te reprezentują globalne anoksyczne wydarzenie oceaniczne OAE 1b. Utwory formacji wierzowskiej mogą stanowić potencjalne skały macierzyste dla systemów obejmujących różnego wieku skały zbiornikowe Karpat zewnętrznych.
EN
The analysis of possibility to find Upper Jurassic--Lower Cretaceous source rocks in the western part of Flysch Carpathians in Poland and Czech Republic was the subject of present paper. The Upper Jurassic organic-rich Mikulov marls represent world-class source rocks. These 1400 m thick organic-rich rocks with TOC value 0.2-10% sourced oils in the Vienna Basin and Carpathian subthrust in Czech Republic and Austria. The similar source rocks perhaps exist in the deeper subthrust areas in Poland. The Vendryne Formation rocks do not contain significant amount of organic carbon. The increased TOC was encountered within the Verovice Formation and uppermost part of Hradiste Formatio. These rocks represent global anoxic event OAE 1b. Verovice Formation contains potential source rocks for the Outer Carpathians systems with reservoirs various in age.
PL
Praca koncentruje się na elementach ważnych dla zrozumienia paleogeografii Zachodnich Karpat zewnętrznych w późnej jurze i wczesnej kredzie w nawiązaniu do litostratygrafii różnych stref facjalnych i opracowania skał macierzystych tworzących się w tym okresie. Opisano szereg elementów paleograficznych: Tetyda alpejska i basen magurski, grzbiet ślaski, basen seweryńsko-mołdawidzki oraz platforma północnoeuropejska. W obrębie tej platformy wyróżniono strefy wyniesione: grzbiet Baska-Inwałd oraz pawłowska platforma węglanowa, a także strefy basenowe: basen bachowicki i basen mikułowski.
EN
The present paper concentrates on the elements important to understanding the paleogeography of the West Carpathians during Late Jurassic and Early Cretaceous times. These elements are linked to the lithostratigraphy of the various facies zones as well as occurrence of hydrocarbon source rocks. Several paleogeographic elements have been described: the Alpine Tethys, Magura Basin, Silesian Ridge, Severin-Moldavidic Basin and North European Platform. The uplifted and basinal zones were distinguished within the platform. The Baska-Inwałd Ridge and Pavlov Carbonate Platform belong to the uplifted elements, while Bachowice and Mikulov basins represent the basinal zones.
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