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    Wyświetlanie 1-12 z 12
    Tytuł:
    Foraminiferal and radiolarian biostratigraphy of the youngest (Late Albian through Late Cenomanian) sediments of the Tatra massif, Central Western Carpathians
    Autorzy:
    Bąk, K.
    Bąk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/138987.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Albian–Cenomanian
    Tatra massif
    biostratigraphy
    foraminifera
    radiolaria
    alb
    cenoman
    Tatry
    masyw
    biostratygrafia
    otwornice
    promienice
    Opis:
    The foraminiferal and radiolarian biostratigraphy of selected sections of the Zabijak Formation, the youngest sediments of the Tatra massif (Central Western Carpathians), have been studied. Benthic foraminifers, mainly agglutinated species, occur abundantly and continuously throughout the studied succession, while planktic foraminifers are generally sparse. Five planktic and two benthic foraminiferal zones have been recognized. The marly part of the Zabijak Formation comprises the Pseudothalmanninella ticinensis (Upper Albian) through the Rotalipora cushmani (Upper Cenomanian) planktic foraminiferal zones, and the Haplophragmoides nonioninoides and Bulbobaculites problematicus benthic foraminiferal zones. The radiolarians were recognized exclusively in the Lower Cenomanian part of the formation.
    Źródło:
    Acta Geologica Polonica; 2013, 63, 2; 223-237
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Late Albian calcareous dinocysts and calcitarchs record linked to environmental changes during the final phase of OAE 1d – a case study from the Tatra Mountains, Central Western Carpathians
    Autorzy:
    Ciurej, A.
    Bąk, K.
    Bąk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060589.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    calcareous dinocysts
    palaeoecology
    upper Albian
    Oceanic Anoxic Event 1d
    Tatra Mts.
    Central Western Carpathians
    Opis:
    Calcareous dinocysts and calcitarchs have been investigated for the first time within the Upper Albian limestone and marl succession of the Zabijak Formation from the High-Tatric Unit in the Tatra Mountains (Central Western Carpathians), related to the Oceanic Anoxic Event 1d (OAE 1d). Four groups of morphotaxa of calcareous dinocysts have been distinguished. They totally dominate the assemblages, and belong to the pithonellids. They are represented by Pithonella sphaerica (Kaufmann in Heer) and P. ovalis (Kaufmann in Heer), which dominate, as well as P. trejoi Bonet and P. lamellata Keupp in Keupp and Kienel, which are less abundant. Two other morphotaxa, Colomisphaera gigantea (Borza) and Cadosina oraviensis Borza, occur sporadically in the assemblages. Both forms represent the calcitarch group, which assembled calcispheres of unknown taxonomic affinity. The calcareous dinocyst and calcitarch diversity is low to moderate, compared to the general species richness known from Late Albian assemblages in other Western Tethyan sections. This is interpreted as a result of nutrient input fluctuations due to changes in the circulation pattern of surface and intermediate waters. The changes in the P. sphaerica/P. ovalis ratio along the Upper Albian section are here correlated with short-term (third-order) sea level fluctuations including transgressive and regressive events and a highstand. Pelletization processes might have influenced cyst abundance on the sea floor, especially during periods with oligotrophic surface waters.
    Źródło:
    Geological Quarterly; 2017, 61, 4; 887--895
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mid-Cretaceous spicule-rich turbidites in the Silesian Nappe of the Polish Outer Carpathians : radiolarian and foraminiferal biostratigraphy
    Autorzy:
    Bąk, M.
    Bąk, K.
    Ciurej, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058910.pdf
    Data publikacji:
    2005
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Outer Carpathians
    middle-upper Cenomanian
    spicule-rich turbidites
    radiolarians
    foraminifers
    biostratigraphy
    Opis:
    Spicule-rich turbidites are widespread in mid-Cretaceous deep-water flysch of the Subsilesian and Silesian units in the Polish Outer Carpathians. The spicule-richmaterial with an admixture of numerous radiolarian and foraminiferal particles was supplied, together with siliciclastic material, from shallow environments, mostly from the northern margin of the Carpathian Basin. We present new data on the age of these deposits in the Silesian Nappe, where they are distinguished as the Mikuszowice Cherts. This unit is composed of mediumand thick-bedded siliciclastic to calcareous turbidites including bluish cherts in their middle and upper parts and of thin non-calcareous hemipelagic shales.We have studied radiolaria and foraminifera from hemipelagic sediments and spicule-rich turbidites, from two continuous sections in the Barnasiówka Range (BeskidWyspowyMts.) that included theMikuszowice Cherts (31 m thick) and their transition into the surrounding units. The age of the Mikuszowice Cherts was determined taking into account the following radiolarian datum events: (1) the occurrence of Praeconocaryomma lipmanae in the entire unit, (2) the FO (first occurrence) of Hemicryptocapsa tuberosa in the upper part of the unit, (3) the FO of Amphipyndax stocki close to the upper boundary of the unit, (4) the FO of Hemicryptocapsa prepolyhedra in the lowermost part of the overlying Barnasiówka Radiolarian Shale Formation. These datum events appear successively in theWestern Tethys successions within the Rotalipora cushmani planktonic foraminiferal Zone, which corresponds to the middle and upper Cenomanian (except for its uppermost part). The foraminiferal assemblages, in which such taxa as Rotalipora cf. cushmani, R. cf. greenhornensis, whiteinellids and Uvigerinammina praejankoi successively appear, confirm the mid-late Cenomanian age of the spicule-rich turbidites in the Silesian Nappe.
    Źródło:
    Geological Quarterly; 2005, 49, 3; 275--290
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Siliciclastic input into Upper Cenomanian synorogenic sediments of the High-Tatric Unit, Central Western Carpathians (Tatra Mountains); petrography, geochemistry and provenance
    Autorzy:
    Wolska, A.
    Bąk, K.
    Bąk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060546.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    petrography
    geochemistry
    Upper Cenomanian
    Zabijak Formation
    High-Tatric Unit
    Central Western Carpathians
    Opis:
    The Upper Cenomanian mixed siliciclastic-carbonate succession of the High-Tatric Unit was deposited during the initial stage of basinal closing of the Tatric area, part of the Zliechov (Križna) Basin (Inner Carpathian domain). As a result of tectonic activity taking place at the northern Veporic margin, pulses of siliciclastic input interrupted marine carbonate sedimentation. The siliciclastic material, part of the Zabijak Formation, has been studied along two sections (Pisana Gully and Zdziarski Gully) in the Western Tatra Mountains. Microfacies, petrographic and geochemical analyses reveal a variability of siliciclastic material composed of various types of granitoids and medium- or high-grade metamorphic rocks, with schists and gneisses. Such interpretation is confirmed by the results of elemental chemical analyses, in which immobile trace elements, such as REE, Th, Cr, Co, Zr, and Y were used as indices for sediment provenance. The parent rocks sustained moderate to intense chemical weathering, documented by chemical weathering indices (CIA, PIA, CIW, R). The weathering occurred in a humid climate with relatively high precipitation that caused strong leaching of particles. Chemical indices related to sorting processes suggest that the recycling of the source material was a minor significance. The siliciclastic input displays a waning upward tendency in the sections, which can be associated with diminishing of the source area by gradual inland progradation of a carbonate platform, caused by a global sea level rise during the Late Cenomanian.
    Źródło:
    Geological Quarterly; 2016, 60, 4; 919--934
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Barnasiówka Radiolarian Shale Formation - a new lithostratigraphic unit in the Upper Cenomanian-lowermost Turonian of the Polish Outer Carpathians (Silesian Series)
    Formacja Łupków Radiolariowych z Barnasiówki - nowa jednostka litostratygraficzna w górnym cenomanie i najniższym turonie w Polskich Karpatach Zewnętrznych (Seria Śląska)
    Autorzy:
    Bąk, K.
    Bąk, M.
    Paul, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/191433.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    lithostratigraphy
    biostratigraphy
    Cenomanian
    Turonian
    Silesian Nappe
    Outer Carpathians
    Opis:
    A new lithostratigraphic unit - the Barnasiówka Radiolarian Shale Formation - is herein defined. It belongs to the Silesian Series of the Outer Carpathians. The formation consists of biosiliceous deposits rich in organic matter, laid down around the Cenomanian-Turonian boundary. The formation includes, from bottom to top: (1) a series of green to black, calcareous and siliceous shales, alternating with layers of chert, siliceous siltstone and sandstone (up to 10 m thick); (2) a series of green to black, argillaceous to siliceous shales, intercalated with tuffites, bentonites, and a ferromanganese layer (up to 9 cm thick) in its middle part (up to 3.2 m thick); (3) a series of green and red, siliceous siltstones and cherts with intercalations of non-calcareous green shales and benthonites (up to 2 m thick). The total thickness of the formation ranges from 0.5 m in the eastern part (reduced tectonically?) up to about 14-15 m in the middle and the western parts of the Silesian Nappe, due to the increase in the number and thickness of turbidite intercalations. The formation represents the Holocryptocanium barbui - Holocryptocanium tuberculatum through the Alie-vium superbum radiolarian zones and the Uvigerinammina praejankoi-Uvigerinammina jankoi foraminiferal zones, which correspond to the Upper Cenomanian through the lowermost Turonian. Microfacies and geochemical characteristics of the distinguished lithological types are presented in this paper, based on recent studies and published data. The described formation has been compared and correlated with deposits of similar age from other tectonic- facies units of the Outer Carpathians in Poland and Ukraine.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2001, 71, No 2; 75-103
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early Carboniferous trilobite remains from limestones of the Dębnik Anticline, southern Poland
    Autorzy:
    Bąk, M.
    Dulemba, P.
    Bąk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/184813.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    trilobites
    arthropods
    Lower Carboniferous
    Dębnik anticline
    Raclawka Valley
    Polska
    Opis:
    The presence of proetid trilobites' remnants is reported for the first time from the Lower Carboniferous limestones of the Dębnik Anticline outcropping in the Raclawka Valley, situated in the eastern part of the Upper Silesian Block (southern part of the Cracow Upland). Disintegrated exoskeletons of trilobites are observed in thin sections of fine-grained, peloidal wackstones and packstones. These rocks contain also foraminifers which indicate an early Tournaisian age for this locality.
    Źródło:
    Geology, Geophysics and Environment; 2014, 40, 1; 27-32
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stromboli – the best place to actively learn and understand the behavior of an active volcano and its processes
    Stromboli – najlepsze miejsce do poznania aktywnego wulkanu i zrozumienia procesów wulkanicznych
    Autorzy:
    Bąk, K.
    Bąk, M.
    Szubert, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/128408.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Aeolian Islands
    basaltic volcanism
    Strombolian activity
    causes of eruptions
    rocks and relief of volcano
    accessible tourism
    Wyspy Liparyjskie (Eolskie)
    aktywność wulkaniczna typu Stromboli
    przyczyny erupcji
    skały i rzeźba wulkanu
    dostępność turystyczna
    Opis:
    Basaltic volcanism, a dominant mode of volcanic activity on Earth, occurs as explosive eruptions, resulting from the exsolution of magmatic gases and is exhibited by Strombolian and Hawaiian types. Strombolian activity takes its name from frequent, small-scale explosions of the Stromboli Volcano, which was formed within the Aeolian Islands, north of Sicily. This paper presents the volcanic structure and features of its activity, based on the results of numerous studies carried out during the last 15 years. In the intention of the authors, this educational presentation would be an incentive to make a decision to travel to Stromboli and see its present-day activity and its effects from just a few hundred meters. To have a safe experience and to avoid accidents and injuries, the tourists need to have sufficient up-to-date information, before they embark on their adventure.
    Wulkanizm bazaltowy (dominujący typ aktywności wulkanicznej na Ziemi), który jest związany z ekshalacją gazów pomagmowych, ma charakter eksplozywnych erupcji określanych mianem typu hawajskiego i strombolijskiego. Aktywność strombolijską charakteryzują częste, niewielkiej objętości wybuchy, które występują m.in. na czynnym wulkanie Stromboli, znajdującym się w łuku Wysp Liparyjskich (Eolskich), na północ od Sycylii. W artykule przedstawiono budowę wulkanu, jego działalność i przyczyny tej działalności na podstawie wyników licznych badań, przeprowadzonych w ciągu ostatnich 15 lat. W intencji autorów przedstawione w sposób możliwie prosty informacje, zdjęcia i ryciny tego wulkanu mają być materiałem edukacyjnym i jednocześnie zachętą do podjęcia decyzji o podróży, żeby z odległości kilkuset metrów móc samemu zobaczyć erupcje wulkaniczne. Aby poznawanie wulkanu było bezpieczne, turyści powinni zapoznać się z aktualnymi informacjami o warunkach panujących na ścieżkach turystycznych.
    Źródło:
    Geotourism / Geoturystyka; 2016, 1-2; 3-18
    1731-0830
    Pojawia się w:
    Geotourism / Geoturystyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evidence of bacteriogenic iron and manganese oxyhydroxides in Albian-Cenomanian marine sediments of the Carpathian realm (Poland)
    Autorzy:
    Bąk, M.
    Bąk, K.
    Górny, Z.
    Stożek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/191443.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    iron
    manganese
    iron-related bacteria
    Albian–Cenomanian
    Silesian Nappe
    Tatra Mts.
    Carpathians
    Opis:
    The Albian and Cenomanian marine sediments of the Silesian and Tatric basins in the Carpathian realm of the Western Tethys contain ferric and ferromanganese oxyhydroxides, visible macroscopically as brown stainings. They coat calcareous bioclasts and mineral clasts, fill pore spaces, or locally form continuous, parallel microlayers, tens of micrometers thick. Light-microscope (LM) and scanning-electron-microscope (SEM) obser- vations show that the coatings contain elongated capsules, approximately 3–5 µm across and enriched in iron and manganese, which may be remnants of the original sheaths of iron-related bacteria (IRB). Moreover, the ferric and ferromanganese staining observed under LM is similar to bacterial structures, resembling the sheaths, filaments and rods formed by present-day bacteria of the Sphaerotilus–Leptothrix group. All of the possible bacteria-like structures are well preserved owing to processes of early diagenetic cementation. If the observed structures are fossil IRB, these organisms could have played an important role in iron and manganese accumulation on the sea floor during Albian–Cenomanian time. The most plausible source of metals for bacterial concentration in the Silesian Basin might have been submarine low-temperature hydrothermal vents, as previously was hypothesized for Cenomanian–Turonian deposits on the basis of geochemical indices.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2015, 85, 2; 371-385
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Foraminiferal stratigraphy of Palaeogene deep-water red facies in the Gorce Mountains (Magura Nappe, Polish Outer Carpathians)
    Autorzy:
    Bąk, K.
    Bąk, M.
    Cieśla, M.
    Paul, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/191980.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    agglutinated Foraminifera
    red claystones and mudstones
    Palaeocene
    Eocene
    Magura Nappe
    Polish Outer Carpathians
    Gorce Mountains
    Opis:
    The deposition of red and variegated mudstones and claystones characterized the ancient Tethys Ocean during Cretaceous and Palaeogene times, including in its north-western part, the Alpine–Carpathian deep-water basins. Palaeogene variegated sediments, containing red mudstone and claystone layers, crop out in the Gorce Mountains (Rosocha creek, near Lubomierz) in the Magura Nappe (Bystrica Subunit) of the Polish Outer Carpathians. These sediments occur as layers 1–10 cm thick and as packages of layers 2–3 m thick that are associated with very thin-bedded turbidites. The entire succession is tectonically disturbed and parts of it belong to the Ropianka, Łabowa Shale and Beloveža Formations. The sediments studied contain 27 genera and 59 species that belong to deep-water agglutinated foraminiferal (DWAF) assemblages. Tubular taxa, which are frequent in various Mesozoic–Cenozoic flysch sediments are relatively rare in the section studied. The assemblages are moderately diverse (3–20 taxa per sample). Excluding tubular forms, the most common taxa belong to Trochamminoides – Paratrochamminoides spp., Saccammina placenta, glomospirids, Recurvoides – Recurvoidella spp. and karrerulinids. The oldest part of the red sediments, referable to the Ropianka Formation, represents the upper part of the Rzehakina fissistomata Zone (probably the Upper Palaeocene). The youngest red sediments, forming thin intercalations in the Beloveža Formation, represent the acme of Reticulophragmium amplectens (middle Lutetian). Owing to tectonic disturbances, most of the Lower Eocene part of the variegated facies of the Łabowa Shale Formation is not preserved in the section studied. The upper part of it, a package 2 m thick, represents the lower part of the Reticulophragmium amplectens Zone. The small thickness (10–15 m) of the Łabowa Shale Formation in the section studied is similar to other sections in the southern part of the Bystrica Subunit. It is probably of a sedimentary nature, reflecting a decreasing number of mud-rich, gravitational flows in the southern part of the Magura Basin during the Early Eocene. Nevertheless, the strong tectonic disturbances that took place in this area during the Oligocene–Miocene folding and overthrusting influenced the reduction in thickness of these sediments.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2013, 83, 3; 201-212
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lithistid spicules in the sediments of the Turonian Variegated Shale in the Silesian Nappe, Polish Outer Carpathians
    Autorzy:
    Okoński, S.
    Górny, Z.
    Bąk, M.
    Bąk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/184590.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    sponge spicules
    lithistida
    Turonian
    Variegated Shale
    Silesian Nappe
    Outer Carpathians
    Opis:
    Turbiditic silty and sandy intercalations in the Turonian Variegated Shale from the Silesian Nappe (Polish Outer Carpathians) contain numerous sponge spicules among siliciclastic fine-grained particles. The highest amount of spicule admixture is nearly 50%. In such layers, they create spiculitic sublitharenite microfacies. These sponge spicules contain forms belonging mostly to the Lithistida group (97% of morphotypes), with a small admixture of spicules from the Hexactinellidae group. Tetraclones with a high content of different types of triaenes dominate among desmas, what indicates the dominance of sponges from subfamily Tetracladina. The preservation state of spicules is generally poor. The Variegated Shale deposits that contain the sponge spicules were accumulated in a deep sea basin, below the calcium compensation depth. Most probably, the spicules were derived from loose material accumulated earlier in various parts of the basin slopes, from which they were exhumed and again redeposited by turbidity currents during the Turonian times.
    Źródło:
    Geology, Geophysics and Environment; 2014, 40, 1; 33-48
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coal-bearing submarine slump sediments from Oligocene–Miocene transition of the Eastern Carpathians (Bieszczady Mountains, SE Poland)
    Autorzy:
    Bąk, K.
    Wolska, A.
    Zielińska, M.
    Bąk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060286.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    coal pebbles
    submarine slump
    petrography
    foraminifera
    Oligocene–Miocene transition
    Outer Carpathians
    Bieszczady Mts.
    Opis:
    A new finding of lustrous coal particles from the youngest flysch sediments of the Silesian Nappe, Polish Eastern Carpathians, outcropped in the Bieszczady Mountains is here presented. The coal material occurs in a 1-m thick submarine slump layer in the Kiczera Dydiowska Sandstones, which belong to the youngest part of the Krosno Beds. Coal particles are numerous (up to 16%) in a massive sandstone of the slump layer. The siliciclastic particles from these sediments are classified as material from weathered rocks of continental block or they have been recycled from post-orogenic sediments. Lustrous coal represents coaly plant fragments, which are mostly homogeneous, belonging to macerals of vitrinite group. Some coal pebbles display tree structure, typical of gelified xylites, due to impregnation of cell walls by resinite, which occurrence in this material indicates terrestrial plants producing waxes and resins. Some of gelified plant debris shows evidence of pyritization, what in the absence of inertinite macerals in coal may indicate dysoxic conditions during first decomposition processes of organic matter under water environment. Coaly-bearing slump moved down most probably from SW during Oligocene–Miocene transition time. This shows that an intrabasinal massif, as the uplifted fragment of ?Precambrian craton, which supplied large amount of siliciclastic material to the Silesian–Subsilesian basin during the lower–middle Oligocene, still existed at the end of the Oligocene.
    Źródło:
    Geological Quarterly; 2015, 59, 2; 300--315
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New data on the age and stratigraphic relationships of the Czajakowa Radiolarite Formation in the Pieniny Klippen Belt (Carpathians) based on the radiolarian biostratigraphy in the stratotype section
    Autorzy:
    Bąk, M.
    Chodacka, S.
    Bąk, K.
    Okoński, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/139119.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Middle-Late Jurassic
    radiolaria
    taxonomy
    biostratigraphy
    Czajakowa Radiolarite Formation
    pelagic siliceous facies
    Pieniny Klippen Belt
    Carpathians
    jura
    promienica
    taksonomia
    biostratygrafia
    Czajakowa Skała
    radiolaryty z Czajakowej
    Pieniński Pas Skałkowy
    Karpaty
    Opis:
    The radiolarian biostratigraphy of the Middle–Upper Jurassic pelagic siliceous sediments (Czajakowa Radiolarite Formation) in the Niedzica succession of the Pieniny Klippen Belt (Carpathians) is interpreted in terms of their age in a stratotype section, and facies equivalents in other tectonic-facies units of this region. The siliceous sediments are represented by radiolarian cherts and silicified limestones which are underlain and overlain by red nodular limestones, equivalents of the Rosso Ammonitico facies. The radiolarian association includes thirty-seven taxa belonging to twenty one genera which represent the Northern Tethyan Palaeogeographic Province. Key radiolarians recorded provide a means of correlation with zonation schemes based on Unitary Associations defined for the Jurassic Tethyan sediments. The age of the Czajakowa Radiolarite Formation in the stratotype section is determined as U.A.Z.9 to U.A.Z.11 corresponding to middle Oxfordian up to Kimmeridgian. Comparison of radiolarian biozones from the stratotype section with other facial equivalent sections in the Pieniny Klippen Belt reveals a significant diachronism for both the lower and the upper limits of the Jurassic pelagic siliceous facies.
    Źródło:
    Acta Geologica Polonica; 2018, 68, 1; 1-20
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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