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    Wyświetlanie 1-8 z 8
    Tytuł:
    Timing of Langhian bioevents in the Carpathian Foredeep and northern Pannonian Basin in relation to oceanographic, tectonic and climatic processes
    Autorzy:
    Holcová, K.
    Doláková, N.
    Nehyba, S.
    Vacek, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059358.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Miocene
    Central Paratethys
    biostratigraphy
    calcareous nannoplankton
    foraminifera
    palynology
    Opis:
    The succession of bioevents in planktonic foraminifer and calcareous nannoplankton communities is reviewed and summarized for the Carpathian Foredeep and northern Pannonian Basin in the time interval between ~16 and 13.5 Ma. This succession can be subdivided into three principal intervals: (1) an interval with rare Praeorbulina sicana and P. glomerosa. It was characterized by a limited immigration of index taxa linked to the lack of a warm surface water layer in the Central Paratethys. This interval can be correlated with the first Badenian transgression near the Burdigalian/Langhian boundary. The rare occurrence of biostratigraphical markers does not allow its precise dating and interregional correlation; (2) a brief interval of the first occurrences of Praeorbulina circularis, Orbulina suturalis and Helicosphaera waltrans. This can be related to the formation of a warm surface water layer suitable for the survival of orbulinas and praeorbulinas and a change from estuarine to anti-estuarine circulation. This interval can be correlated with the second Badenian transgression, which, however, was not isochronous over the area as inferred from different successions of these first occurrences; (3) a limited appearance of new index taxa in the Central Paratethys prior to the Wielician Salinity Crisis. This time interval was characterized by increased seasonality and salinity oscillations followed by climate cooling. A “reverse” migration of the stress-tolerant species Helicosphaera walbersdorfensis from the Central Paratethys to the Mediterranean is suggested. Several local bioevents with limited stratigraphic correlation potential have been recognized in this interval.
    Źródło:
    Geological Quarterly; 2018, 62, 1; 3--17
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconstruction of the unusual Middle Miocene (Badenian) palaeoenvironment of the Carpathian Foredeep (Lomnice/Tišnov denudational relict, Czech Republic)
    Autorzy:
    Holcova, K.
    Brzobohatý, R.
    Kopeckáa, J.
    Nehyba, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059990.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Badenian
    Carpathian Foredeep
    lithology
    otoliths
    foraminifera
    calcareous nannoplankton
    Opis:
    Multiproxy sedimentological, gamma-spectrometric, foraminiferal, calcareous nannoplankton, and otolith data were used for the reconstruction of the Badenian (Middle Miocene) history of the Moravian part of the Carpathian Foredeep. The study material originated from the new borehole LOM-1, which drilled >20 metres of monotonous clayey siltstones with exceptionally rich and well-preserved microfossil assemblages. Distal parts of the Carpathian Foredeep (a forebulge depozone) are exposed in this succession. Generally, a quiet environment of outer shelf to upper bathyal of monotonous clayey silts was interpreted, which is typical for the proximal parts of a peripheral foreland basin. The section studied can be subdivided into six intervals, confirming the cyclical character of Middle Miocene sedimentation in the Central Paratethys. Interannual oscillations of nutrient content, temperature and/or salinity are interpreted based on the oscillations of geochemical as well as palaeobiological data. The turnover connected with the initiation of the Middle Miocene Climatic Transition is recorded above the LO (last occurrence) of Helicosphaera waltrans in agreement with previous observations in the Carpathian Foredeep. The changes include cooling, a decrease in nutrients, a probable increase of the salinity of surface water, and increase of seasonality. Seasonality was manifested by an alternation of mixed and stratified water columns with a seasonal input of nutrients. Concerning nutrients, sources of seasonal riverine input or seasonal upwelling are both possible.
    Źródło:
    Geological Quarterly; 2015, 59, 4; 654--678
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantitative calcareous nannoplankton biostratigraphy of the Oligocene/Miocene boundary interval in the northern part of the Buda Basin (Central Paratethys)
    Autorzy:
    Holcová, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058889.pdf
    Data publikacji:
    2005
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Central Paratethys
    Oligocene/Miocene boundary
    calcareous nannoplankton
    quantitative biostratigraphy
    Opis:
    Relative abundances of seventeen calcareous nannoplankton species were analysed from around the Oligocene/Miocene boundary interval (NP 25-NN 2 Zones) in the northern part of the Buda Basin (Central Paratethys). A succession of four bioevents can be observed in all sections: FAD of Helicosphaera carteri, FAD of Reticulofenestra cf. pseudoumbilica, and FADs of Discoaster druggii and Helicosphaera scissura, FAD of Helicosphaera ampliaperta. The ligocene/Miocene boundary lies between the FAD of Reticulofenestra cf. pseudoumbilica and FADs of Discoaster druggii and Helicosphaera scissura; events known to approximate it are not recognized.
    Źródło:
    Geological Quarterly; 2005, 49, 3; 263--274
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calcareous nannoplankton in the Upper Jurassic marine deposits of the Bohemian Massif: new data concerning the Boreal–Tethyan communication corridor
    Autorzy:
    Holcová, K.
    Holcová, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059943.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    calcareous nannoplankton
    Late Jurassic
    North Bohemian Massif
    biostratigraphy
    paleoecology
    Opis:
    Calcareous nannoplankton assemblages from the Jurassic relict deposits in the northern part of the Bohemian Massif are described here for the first time. They are generally of low diversity and dominated by watznaueriaceans. Some of them are diagenetically affected, probably due to dolomitisation. Calcareous nannoplankton enables the stratigraphical range of the Northern Bohemia Jurassic succession to be extended to the Tithonian by reference to the stratigraphical range of Jurassic platform sequences in Central Poland and the eastern part of the Bohemian Massif. The Oxfordian–Kimmeridgian nannofossil assemblages indicate a generally oligotrophic condition of the restricted sea with episodic fluvial input containing terrestrial nutrients. The character of the upper part of the water column was generally uniform and did not reflect variability at the sea-floor expressed by lithofacies diversity. The palaeoenvironment interpreted for the famous former palaeontological locality “Sternberk Quarry” was characterized by a higher nutrient content and more stable environment. The Tithonian nannofossil assemblages contain warm-water Tethyan taxa which suggest south-north migration of nannoplankton due to warming during the Jurassic–Cretaceous boundary interval.
    Źródło:
    Geological Quarterly; 2016, 60, 3; 624--636
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New data on the late Badenian–Sarmatian deposits of the Nowy Sacz Basin (Magura Nappe, Polish Outer Carpathians) and their palaeogeographical implications
    Autorzy:
    Oszczypko-Clowes, M.
    Oszczypko, N.
    Wójcik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059227.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Middle Miocene
    freshwater and marine deposits
    lithostratigraphy
    calcareous nannoplankton
    Opis:
    In the Nowy Sacz Basin, newly exposed Middle Miocene deposits have been studied and sampled in the Kamienica Nawojowska, Poprad and Dunajec rivers. The calareous nannoplankton of the freshwater to marine deposits was examined. Palegrey and brown clayey shales with plant remains and thin seams of lignite represent the freshwater depos its of the Biegonice Formation. These deposits pass upwards into ca. 50 m thick packet of brackish and marine deposits, represented mainly by dark marly shales with bivalves and gastropods of the Iwkowa and Niskowa formations. These deposits contain relatively rich late Badenian to Sarmatian calcareous nannoplakton (NN6/7 Zone).
    Źródło:
    Geological Quarterly; 2009, 53, 3; 273-292
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Newly discovered Early Miocene deposits in the Nowy Sącz area (Magura Nappe, Polish Outer Carpathians)
    Autorzy:
    Oszczypko, N.
    Oszczypko-Clowes, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059925.pdf
    Data publikacji:
    2002
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Outer Carpathians
    Magura Nappe
    Early Miocene
    calcareous nannoplankton
    palaeotectonic implications
    Opis:
    In the Nowy Sącz area Early Miocene marine deposits have been discovered in the southern part of the Rača Subunit, and at the front of the Bystrica Subunit of the Magura Nappe. These deposits belong to the Zawada Formation, which is represented by medium- to thick-bedded glauconitic sandstones with intercalations of thick-bedded marls and marly claystones. The formation is at least 550 m thick. Calcareous nannofossils show the age of the formation to be Early Burdigalian (NN1-2-3 biozones). Due to a lack of exposures the relationship between the deposits of the Malcov and the Zawada formations is not yet clear. However, comparing the youngest age of the Malcov Formation in the Nowy Sącz I borehole (NP 25) with the age of the Zawada Formation suggests sedimentary continuity transition between these formations.
    Źródło:
    Geological Quarterly; 2002, 46, 2; 117-134
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Early Miocene residual flysch basin at the front of the Central Western Carpathians and its palaeogeographic implications (Magura Nappe, Poland)
    Autorzy:
    Oszczypko-Clowes, M.
    Oszczypko, N.
    Piecuch, A.
    Soták, J.
    Boratyn, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060420.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Outer Carpathians
    Magura Nappe
    residual flysch basin
    Early Miocene
    calcareous nannoplankton
    palaeogeography
    Opis:
    In the Polish sector of the Magura Nappe, along the front of the Pieniny Klippen Belt, strongly tectonized calcareous flysch up to 1000 m thick is exposed. Previously these deposits, composed of thin- to thick-bedded flysch, with a packet of Łącko-type marls, have been included into several Paleocene/Eocene formations, e.g., the Szczawnica Formation. This formation contains a poor assemblage of agglutinated foraminifera and a relatively rich assemblage of calcareous nannoplankton, with abundant reworked species. The youngest species give evidence of the NN2 Zone (Lower Miocene). Additionally, in three profiles (Szlachtowa, Knurów and Waksmund) of the Kremna Fm., Early Miocene foraminifera have been recognized. This research documented that during the Burdigalian, at the front of Central Western Carpathians, there still existed a residual marine basin probably up to 100 km wide. These deposits also contain thick packages of exotic carbonate conglomerates derived from the SE, previously regarded as the Jarmuta Formation.
    Źródło:
    Geological Quarterly; 2018, 62, 3; 597--619
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fossils from the Silesian-Subsilesian series of the Polish Western Carpathians : the implications for changes in sea-level and the marine environment during the Albian-Turonian
    Autorzy:
    Szydło, A.
    Jugowiec-Nazarkiewicz, M.
    Olszewska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059811.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    fossils
    calcareous nannoplankton
    environments
    sea-level
    anoxic and biotic events
    Albian-Turonian
    Subsilesian-Silesian zone
    Western Outer Carpathians
    Polska
    Opis:
    Fossils and exotics from the Albian-Cenomanian deposits of the Western Polish Carpathians are discussed in relation with changes in depositional environments. Environmental conditions were controlled by geotectonic activity, sea-level changes and also anoxic and biotic events. During the Albian-the Early Cenomanian, and in the Turonian the fall in sea level led to increased supply of coarse-grained material rich in siliceous and sometimes calcareous bioclasts and exotics. This cyclic process has contributed to changes in the marine biota. In the Albian monogenic foraminiferal assemblages with the surficial epifauna corresponding to the organic influx and oxygen deficiency (OAE 1b) were evolved into more variable associations including deep infauna, which indicated more aerobic conditions. Under these conditions also preserved planktonic and calcareous benthic fossils, which indicated the supply of terrigenous material from shallow-water environments and land. During the Albian-Turonian transition intensive subsidence and volcanic activity associated with eustatic sea-level rise led to intensive production of phytoplankton. The sea-surface productivity and enhanced upwelling resulted in expanded short-term oxygen minima at the end of the Albian (OAE 1d) and the Cenomanian (OAE 2). In the latter interval benthic forms almost extinct while siliceous and calcareous plankton survived. In the Turonian changes in sea-level and sedimentary regime led to recolonization of the basin bottom.
    Źródło:
    Geological Quarterly; 2015, 59, 1; 215--228
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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