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    Wyświetlanie 1-7 z 7
    Tytuł:
    Trace fossils from the Lower Jurassic Ciechocinek Formation, SW Poland
    Autorzy:
    Leonowicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061349.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    trace fossils
    fine-grained clastics
    brackish environment
    Lower Jurassic
    Opis:
    Mud-silt deposits of the Lower Jurassic Ciechocinek Formation from the Czestochowa-Wielun region are characterized by a low diversity ichnofossil association, which includes the ichnogenera Planolites, Palaeophycus, Helminthopsis, Gyrochorte, Protovirgularia and Spongeliomorpha as well as some unidentified pascichnia. This association points to deposition in a low-energy brackish environment with poorly oxygenated sediments. Changes of seafloor oxygenation, influenced by periodical bottom currents, resulted in various bioturbation intensities, which range from none to high.
    Źródło:
    Volumina Jurassica; 2008, 6, 1; 89-98
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pliocene-Quaternary stratigraphy and sedimentation at the Neretva River Mouth, on Croatian Adriatic Coast
    Autorzy:
    Balic, D.
    Malvic, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059719.pdf
    Data publikacji:
    2013
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Adriatic
    Neretva
    delta
    clastics
    Pliocene
    Opis:
    The Adriatic Sea is an epicontinental, closed sea, part of the Mediterranean. It formed in the Late Miocene, and ended structurally during the Pliocene and Quaternary, when most of its sediments were deposited. The larger Pliocene and Quaternary depressions occur mostly by the western coast, where the deposits are several thousand metres thick, and were sourced from the Alps and the Apennines. The east coast is characterised by the large and elongated Dinarides Mts., that have continental drainage extremely close to the shoreline and a very small erosional rate. Consequently, eastern inflows were and are very short, including strongly tidal estuaries that erode only small volumes of mostly carbonate detritus, adjacent to frontal islands or mountains, with restricted depositional areas. The Neretva River deposits make up part of the largest contemporary delta system on the eastern Adriatic coast, and have been analysed in this study using three seismic sections and one exploration well. These deposits are recognized inside the Neretva and Korčula channels, assuming that processes operating during Quaternary glacial phases shifted the delta tens of kilometres to the west in the past on several occasions.
    Źródło:
    Geological Quarterly; 2013, 57, 2; 233--241
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carbonate-clastic sediments of the Dudziniec Formation in the Kościeliska Valley (High-Tatric series, Tatra Mountains, Poland) : role of syndepositional tectonic activity in facies development during the Early and Middle Jurassic
    Autorzy:
    Jezierska, A.
    Łuczyński, P.
    Staśkiewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060544.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    carbonates
    clastics
    synsedimentary tectonics
    Dudziniec Formation
    Lower and Middle Jurassic
    Tatra Mts.
    Opis:
    Sediments of the Dudziniec Formation (Lower Jurassic – Aalenian) outcropping in the Kościeliska Valley (autochthonous unit of the High-Tatric series) are represented by a range of mixed carbonate-clastic deposits. Seven lithofacies have been distinguished based on lithology, sedimentary structures, colour and composition of intra- and extraclasts, with sandstones and crinoidal limestones as end members of a continuous spectrum of facies. The study area represents a shallower part of the sedimentary basin located in the vicinity of source areas, as compared to the Chochołowska Valley region located in the west. Facies characteristics and distribution were controlled mainly by synsedimentary tectonic activity, with sandy varieties representing periods of faulting with enhanced influx of extraclasts, and with crinoidal limestones corresponding to intervals of relative tectonic stability. Such influence of synsedimentary tectonics on the deposition in the Early Jurassic strongly resembles the Middle Jurassic development in the High-Tatric area. Neptunian dykes cutting the Dudziniec Formation, and most probably filled by Lower Jurassic sediments, are yet another indication of tectonic instability of the area in the Early Jurassic.
    Źródło:
    Geological Quarterly; 2016, 60, 4; 869--880
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sedimentary characteristics of the Hüdaý Formation (Early Cambrian) within the Aydincik (ÝÇEL) area, S Turkey
    Autorzy:
    Eren, M.
    Öner, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/191184.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    sedimentology
    Early Cambrian
    clastics
    Hüdai Formation
    facies
    Turkey
    Opis:
    The study area is located in Aydýncýk (ÝÇEL) area where Early Cambrian rocks are represented by the Hüdai Formation. The formation represents three different parts in the vertical sequence which has a thickness of approximately 830 metres. The basal part of the formation consists of a rhytmic alternation of horizontal laminated sandstone, ripple trough cross-laminated sandstone, mixed sandstone-shale, and rarely metashales. The middle part comprises dominantly metashales. The upper part is made up by an alternation of horizontal laminated sandstone, mixed sandstone-shale and rarely metashales. Vertical variations in the formation is caused by marine transgressious and regressious, and by fluctuations in sediment supply. Lower to middle parts of the formation characterize a fining-upward sequence, and middle to upper parts display a coarsening-upward sequence. In the Hüdai Formation, four lithofacies are recognized based on lithology and sedimentary structures. These are (1) horizontal laminated sandstone (predominantly quartzarenite) indicating deposition from tidal currents during the high velocity phases of tidal cycles; (2) ripple cross-laminated sandstone (predominantly quartzwacke) deposited in lower part of intertidal (sand-flat) environment; (3) mixed sandstone-shale revealing deposition in mid-intertidal flat environment; and (4) shale (or metashale) deposited mainly in upper intertidal (mudflat) environment.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2000, 70, No. 3-4; 251-259
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nd and Sr isotopic evidence for provenance of clastic material of the Upper Triassic rocks of Silesia, Poland
    Autorzy:
    Konieczna, N.
    Belka, Z.
    Dopieralska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/191300.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Nd isotopes
    Sr isotopes
    clastics
    provenance
    Upper Triassic
    Polska
    Opis:
    Nd and Sr isotope data were used to characterize the sources of the Upper Triassic (Keuper) siliciclastic rocks of Silesia in southern Poland. This continental succession, consisting predominantly of fine-grained mud- stones and siltstones, yields a remarkably uniform Nd isotopic composition. Nd model ages T2DM vary from 1.56 to 1.69 Ga and εNd values are in the range from –8.9 to –11.2, documenting old crust contribution in the provenance. In contrast, the Sr isotopic composition (87Sr/86Sr) of the clastics exhibits a relatively large variation from 0.710 to 0.723. The isotopic compositions indicate that the southern part of the Germanic Basin in Silesia was supplied with clastic material from the Bohemian Massif. The axis of the drainage area must have crossed from SW to NE the Saxothuringian units of the East Sudetes and most probably also the area of the Tepla–Barrandian Unit. There is no indication of any sediment transport from the Moravo-Silesian Belt and the Fore-Sudetic Block. It seems, that the Palaeozoic rocks of the latter domain must have been buried completely during Late Triassic times.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2015, 85, 4; 675-684
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Jurassic syn-rift and Cretaceous syn-orogenic, coarse-grained deposits related to opening and closure of the Vahic (South Penninic) Ocean in the Western Carpathians – an overview
    Autorzy:
    Plasienka, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060512.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Western Carpathians
    Mesozoic
    rifting
    thrusting
    deep-marine clastics
    mass flow deposits
    Opis:
    Although no undoubted oceanic crustal rock complexes of Penninic affinity participate in the present surface structure of the Western Carpathians, indirect lines of evidence suggest prolongation of the South Penninic-Vahic oceanic tract into the ancient Carpathians. The sedimentary record of both the syn-rift and syn-orogenic clastic deposits reveal their origin between the outer Tatric (Austroalpine) and the inner Oravic (Middle Penninic) margins. The rifting regime is exemplified by the normal fault-related scarp breccias of the Jurassic Borinka Unit in the Male Karpaty Mts., which are characterized by local, gradually denuded source areas. Two other regions provide examples of a contractional regime, both related to shortening and closure of the Vahic oceanic domain. The Belice Unit in the Povazsky Inovec Mts. includes Upper Jurassic-Lower Cretaceous eupelagic, mostly siliceous deposits and a thickening-upwards Senonian sequence of turbiditic sandstones, conglomerates and chaotic breccias. It is inferred that this succession represents the sedimentary cover of oceanic crust approaching a trench, its incorporation in the accretionary complex and finally underthrusting below the outer Tatric margin. In the Oravic units of the Pieniny Klippen Belt, deep-marine conglomerate/breccia bodies with olistoliths indicate collision-related thrust stacking that started from the Maastrichtian (Gregorianka Breccia of the Sub-Pieniny Unit) and terminated with the Lower Eocene Milpos Breccia in the Saris Unit. In addition, a tentative recycling scheme of “exotic” clastic material from mid-Cretaceous conglomerates of the Klape Unit to various Klippen Belt units is outlined. This material is considered to be unrelated to the Vahic oceanic realm and its closure, and likely represents erosional products of more distant orogenic zones.
    Źródło:
    Geological Quarterly; 2012, 56, 4; 601--628
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Facies variability in the Cambrian deposits from the Kościerzyna and Gdańsk sections (Pomeranian Caledonides foreland, northern Poland) : a comparative study
    Autorzy:
    Jaworowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059452.pdf
    Data publikacji:
    2000
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    northern Poland
    Cambrian
    transgressive-regressive cycle
    condensed deposit
    sources of clastics
    Opis:
    The origin of Cambrian clastics occurring in the marginal part of the East European Craton, in the foreland of the Pomeranian Caledonides is discussed. They were deposited in an epicontinental sea influenced by tides and storms. The first Lower Palaeozoic transgressive-regressive (T-R) cycle spans the Lower and most of the Middle Cambrian. The maximum transgression in the craton-margin part (Kościerzyna section) is marked by submarine erosion and a very low deposition rate around the Lower/Middle Cambrian boundary. The condensed deposit is a limestone - shell hash packstone with phosphatized mudstone clasts. In the inner part of the craton (Gdańsk section), the condensed deposit is represented by mudstones and heterolithic deposits with iron ooids. Transgressive phase deposits of the first T-R cycle from the Kościerzyna section are 323.5 m thick, while regressive phase deposits - 273.7 m thick. In the Gdańsk section the thicknesses are of 113.0 and 218.8 m, respectively. Deposits of the first T-R cycle of northern Poland and the Polish part of the Baltic Sea are overlain by those of the second T-R cycle, which, when complete, comprise the uppermost Middle Cambrian, Upper Cambrian and Lower Tremadoc. In both the sections discussed, deposits of the second T-R cycle were almost completely removed by pre-Arenig erosion. Facies analysis of deposits of the first T-R cycle from the Kościerzyna and Gdańsk sections shows that the source areas of terrigenous material, during both transgressive and regressive phases of this cycle, were elevated zones of the East European Craton.
    Źródło:
    Geological Quarterly; 2000, 44, 3; 249-260
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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