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    Wyświetlanie 1-7 z 7
    Tytuł:
    Palynology and microfacies of Lower Devonian mixed carbonate-siliciclastic deposits in Podolia, Ukraine
    Autorzy:
    Filipiak, P.
    Zaton, M.
    Szaniawski, H.
    Wrona, R.
    Racki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/19979.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    palynology
    microfacies
    Lower Devonian
    Devonian
    carbonate-siliciclastic deposit
    Podolia
    Ukraine
    stratigraphy
    cuticle
    arthropod
    Opis:
    Investigation of mixed carbonate−siliciclastic Lower Devonian deposits have been carried out in the Ivanye Zolote and Ustechko sections in Podolia, Ukraine. Based on palynomorph evidence, the age of the samples studied is late Lochkovian, not older than the NM Oppel Miospore Zone, specifically the Si Lineage Zone. The presence of acritarchs and chitinozoans points to dominantly marine depositional conditions. However, a regressive environmental change toward more brackish conditions is indicated by a decrease in the taxonomic diversity of acritarchs in the topmost samples, the simultaneous disappearance of chitinozoans, and an increase in leiosphaerid frequency. Furthermore, evolution of limestone microfacies demonstrates a progressive transition from a shrinking marine basin toward a brackish, storm−affected muddy lagoon, manifested by recurrent profusion of impoverished, mostly opportunistic and euryhaline shelly benthos (nuculanid bivalves, leperditicopids and other ostracods, terebratulid brachiopods), chaetetid demosponges and diverse ichthyofauna. The association of plant (mainly nematophytes and some tracheids) and animal (eurypterid, ?scorpion, and possibly other arthropod) remains points to the presence of nearby Early Devonian wetland vegetation, providing food and shelter for various semi−aquatic and other terrestrial arthropods.
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model deformacji strefy krawędziowej centralno-wschodniej mikropłyty irańskiej w warunkach konwergencji płyt litosfery —na podstawie badań geologiczno-geofizycznych i modelowań numerycznych
    Modeling deformations of marginal zone of the Iranian microplate under conditions of convergent plate boundaries on the basis of geological-geophysical studies and numerical simulations
    Autorzy:
    Konon, A.
    Barski, M.
    Koprianiuk, M.
    Nadimi, A.
    Słaby, E.
    Szaniawski, R.
    Wysocka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2066234.pdf
    Data publikacji:
    2010
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Iran
    paleografia
    paleotektonika
    palogeography
    paleotectonic
    Źródło:
    Przegląd Geologiczny; 2010, 58, 1; 42-45
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Faunal dynamics across the Silurian-Devonian positive isotope excursions (delta13C, delta18O) in Podolia, Ukraine: Comparative analysis of the Ireviken and Klonk events
    Autorzy:
    Racki, G.
    Balinski, A.
    Wrona, R.
    Malkowski, K.
    Drygant, D.
    Szaniawski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/20924.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    fauna dynamics
    Silurian
    Devonian
    isotope excursion
    Podolia
    Ukraine
    comparative analysis
    Ireviken event
    Klonk event
    Brachiopoda
    Conodonta
    Chitinozoa
    carbon isotope
    oxygen isotope
    geochemistry
    Opis:
    Two global isotopic events, the early Sheinwoodian (early Wenlock) and that at the Silurian–Devonian transition, have been comprehensively studied in representative carbonate successions at Kytayhorod and Dnistrove, respectively, in Podolia, Ukraine, to compare geochemistry and biotic changes related correspondingly to the Ireviken and Klonk events. These two large−scale isotope excursions reveal different regional ecosystem tendencies. The well−defined increasing trend across the Llandovery–Wenlock boundary in siliciclastic input, redox states and, supposedly, bioproductivity, was without strict correlative relations to the major ¹³C enrichment event. The environmental and biotic evolution was forced by eustatic sea−level fluctuations and two−step climate change toward a glaciation episode, but strongly modified by regional epeirogeny movements due to location near the mobile Teisseyre−Törnquist Fault Zone. Thus, the global early Sheinwoodian biogeochemical perturbation was of minor depositional significance in this epeiric sea, as in many other Laurussian domains. Conversely, the Podolian sedimentary record of the Klonk Event exhibits temporal links to the abrupt δ¹³C anomaly, overprinted by a tectonically driven deepening pulse in the crucial S–D boundary interval. This carbon cycling turnover was reflected in the regional carbonate crisis and cooling episodes, paired with a tendency towards eutrophication and recurrent oxygen deficiency, but also with major storms and possible upwelling. Faunal responses in both Podolian sections follow some characters of the Silurian pattern worldwide, as manifested by conodont changeover prior to the major early Sheinwoodian isotopic/climatic anomaly. This contrasts with the relative brachiopod and chitinozoan resistances in the course of the Ireviken Event. Also, during the Klonk Event, a moderate faunal turnover, both in benthic and pelagic groups, occurred only near the very beginning of the prolonged ¹³C−enriched timespan across the system boundary, possibly due to progressive dysoxia and temperature drop. The characters point to a peculiarity of the Klonk Event by comparison with the Silurian global events, and some similarity already to the succeeding Devonian transgressive/anoxic episodes.
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polychaete jaw apparatuses and scolecodonts from the Upper Devonian of Poland
    Aparaty szczękowe wieloszczetów i skolekodonty z dewonu górnego Polski
    Cheljustnye apparaty i skolekodonty mnogoshhetnikovykh iz verkhnego devona Polshi
    Autorzy:
    Szaniawski, H.
    Wrona, R.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/21255.pdf
    Data publikacji:
    1973
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Źródło:
    Acta Palaeontologica Polonica; 1973, 18, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New species of Upper Cambrian conodonts from Poland
    Nowe gatunki konodontów z kambru górnego Polski
    Novye vidy konodontov iz verkhnego kembrija Polshi
    Autorzy:
    Szaniawski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/20249.pdf
    Data publikacji:
    1971
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Źródło:
    Acta Palaeontologica Polonica; 1971, 16, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Palaeomagnetic age constraints indicate post-Varis can orgin of massive breccia in Wietrznia Quarry (Holy Cross Mountains, Central Poland)
    Autorzy:
    Szaniawski, R.
    Lewandowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059223.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Holy Cross Mountains
    palaeomagnetism
    conglomerate test
    palaeomagnetic dating
    Opis:
    Palaeomagnetic study has been carried out to resolve the controversy over the age and origin of the massive breccia body exposed in Wietrznia Quarry in the Holy Cross Mountains. The breccia studied consists of variously sized angular fragments of Frasnian and Fammenian limestone and shale infilling a palaeodepression within Frasnian limestone. Forthis purpose, the conglomerate test has been applied that enables determination of the relative age of remanence components and formation of the breccia. Palaeomagnetic analysis of breccia clasts reveals the presence of two characteristic components of magnetization. The observed components are akin to those previously described from in situ rocks at Wietrznia Quarry and from other Devonian carbonates from the Holy Cross Mountains. Such components have been interpreted as early synfolding and postfolding over prints of Viséan and Early Permian age. The palaeomagnetic conglomerate test performed in this study are positive results, indicating that the breccia postdates both components. This implies that the breccia is not of synsedimentary character and postdates Variscan de formation.
    Źródło:
    Geological Quarterly; 2009, 53, 3; 357-362
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Palaeomagnetic age constraints on folding and faulting events in Devonian carbonates of the Kielce Fold Zone (southern Holy Cross Mountains, Central Poland)
    Autorzy:
    Szaniawski, R.
    Konon, A.
    Grabowski, J.
    Schnabl, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059146.pdf
    Data publikacji:
    2011
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    remagnetisations
    palaeomagnetic components
    tectonics
    Opis:
    The results of numerous palaeomagnetic studies performed in the last three decades in Devonian carbonates of the Holy Cross Mountains (HCM) have documented the occurrence of several episodes of remagnetisation. This knowledge was applied in this study to determine the temporal relationships between the acquisition of particular secondary palaeomagnetic components and the formation of tectonic structures. This made it possible to estimate the timing of several episodes in the multistage tectonic evolution of particular folds and faults. We show that the westernmost part of the southern HCM was rotated clockwise after the early Permian. Detailed palaeomagnetic analysis documented also shape modifications in some map-scale and minor folds. This tectonic overprinting of originally Carboniferous folds postdated the early Permian. It was furthermore shown that the N-S trending dextral strike-slip faults studied were active between the early Permian and the Permo/Triassic. Our recent data show also the post-early Permian age of breccia that covers the deformed Devonian strata.
    Źródło:
    Geological Quarterly; 2011, 55, 3; 223-234
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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