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    Wyświetlanie 1-2 z 2
    Tytuł:
    Topography of the Magura floor thrust and morphotectonics of the Outer West Carpathians in Poland
    Autorzy:
    Zuchiewicz, W.
    Oszczypko, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/191413.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    morphotectonics
    neotectonics
    Pliocene–Quaternary
    Magura thrust
    Outer Carpathians
    Polska
    Opis:
    Neotectonic (Pliocene-Quaternary) elevations and depressions detected on maps of subenvelope surfaces of the topography of the Outer West Carpathians of Poland are, to a certain extent, portrayed on the map showing topography of the Magura floor thrust, particularly in the western segment of the study area. The floor thrust of the Magura Nappe is highly uneven, its position changing from 725 m a.s.l. to more than 7,000 m b.s.l. The most prominent depression is located in the medial (S of Dunajec and Poprad confluence) segment of the Polish Outer Carpathians (2-7 km b.s.l.), and its axis trends NW-SE from the eastern margin of the Mszana Dolna tectonic window to the Poprad River valley. Another, much more shallower, Jordanów depression (2 km b.s.l.) is to be found NW of the Mszana Dolna tectonic window, shortly north of the Skawa River valley. Elevated structures, in turn, include the Mszana Dolna tectonic window, Sól-Skomielna (on the west), and Limanowa (on the east) elevations of subparallel orientation. Still farther to the east, a longitudinal elevation extending between the Klęczany-Pisarzowa and Świątkowa tectonic windows is to be seen some 10-15 km south of the Magura frontal thrust. South of this area, the Magura floor thrust slopes steeply down to more than 4 km b.s.l. A comparison between the pattern of elevated and subsided structures of the Magura floor thrust and subenvelope surfaces of different orders shows that in the western part of the Polish Outer Carpathians the highest-elevated neotectonic structures (in the southern portion of that area) coincide with depressions of the Magura thrust, whereas farther north a reverse pattern becomes dominant: neotectonic elevations coincide either with the Magura frontal thrust or with elevations of its surface. This is particularly true for an area comprised between 20° and 20°30’E meridians. The origin of such relationships is difficult to explain. We infer that one of possible factors could be Pliocene-Quaternary reactivation of faults cutting the Magura floor thrust, and particularly that one, which appears to separate the western-medial segment of the Outer Carpathians from their more eastern portion.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2008, 78, No 2; 135-149
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Source Rock Prediction Value: world provinces during Late Jurassic–earliest Cretaceous times and position of West Carpathians in SRPV prediction
    Autorzy:
    Golonka, J.
    Krobicki, M.
    Waśkowska, A.
    Matyasik, I.
    Pauken, R.
    Bocharova, N. J.
    Edrich, M.
    Wildharber, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/191466.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Opis:
    Thirty-six Late Jurassic–Early Cretaceous regions were evaluated to obtain the Source Rocks Predic- tion Value (SRPV). We focused on three major processes, which control the organic richness in a specific paleogeographic, climatic and tectonic setting. These three processes are biologic productivity, background sedimentation rates with non-dilution of organic richness by clastic sedimentation, and preservation of organic matter. A high or increased level of primary biologic productivity supports an increased flux of organic carbon to the sediments of the sea floor. When sedimentation rate increases, especially of fine-grained sediment, the organic matter content of the sediment also increases. Preservation of organic matter depends on domination of anoxic conditions during periods of stagnation of Carpathian basins. The debate over which of the three primary pro- cesses is the most important control on the accumulation of organic-rich facies is inconclusive. We assume that the three processes are equally important, and that the balance between them has the overriding control. The amount and richness of organic matter buried in marine sediments then depends on the balance between production and destruction, where the latter includes consumption, decomposition, and dilution. The modeling of the Source Rocks Prediction Value has placed the marginal Tethyan Ocean (Carpathian basin) among the basins, which contain the richest Late Jurassic–Early Cretaceous source rocks in the world. Using the semi-quantitative Delphi method for 36 Late Jurassic regions, which represents a single tectono-depositional province in this time, we evaluated the assessment of SRPV for each of these. The south-Caspian and Central Asia basin was ranked eighth, while the Carpathian basin ninth. The paleogeographic and paleoclimatic settings are indicated as main factors in distribution by basins of known organic-rich rocks. The high organic productivity of the Carpathian basins was caused by upwelling, as well as restricted conditions in the narrow rift basins. The Upper Jurassic organic-rich Mikulov marls representing world-class source rocks (in the southeastern Czech Republic and north-eastern Austria) and Upper Jurassic–lowermost Cretaceous Vendryně Formation rocks were used as local example in analysis of oil source deposits within West Carpathian arc. The average measured Source Potential Index (SPI) for both investigated Upper Jurassic organic rich formations is around 10 and this value fits very well the SPI pre- dicted for Carpathian Upper Jurassic using Source Rocks Prediction Value method.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2009, 79, No 2; 195-211
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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