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Wyświetlanie 1-2 z 2
Tytuł:
Analiza tempa depozycji materiału detrytycznego w basenach sedymentacyjnych zachodnich Karpat zewnętrznych jako wskaźnik aktywności tektonicznej ich obszarów źródłowych
Tectonic activity of sediment source areas for theWestern Outer Carpathian basins—constraints from analysis of sediment deposition rate
Autorzy:
Poprawa, P.
Malata, T.
Oszczypko, N.
Słomka, T.
Golonka, J.
Krobicki, M.
Powiązania:
https://bibliotekanauki.pl/articles/2074424.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
basen sedymentacyjny
depozycja
aktywność tektoniczna
Karpaty Zachodnie
Western Outer Carpathians
Mesozoic
Cainozoic
sediment source area
deposition rate
Opis:
Analysis of deposition rate were performed for synthetic sections, representing the upper Jurassic to lower Miocene sedimentary fill of the Western Outer Carpathian (WOC) basins. Calculated deposition rates differs in a range of a few orders of magnitude. During Tithonian to Berriasian-early Valanginian tectonic activity of the source areas supplying the Silesian Basin was related to the mechanism of syn-rift extensional elevation and erosion of horsts. General decay of source area activity in Valanginian to Cenomanian time was caused by regional post-rift thermal sag of the WOC. The Barremian to Albian phase of compressional uplift of the source area located north of the WOC lead to increase of deposition rate in some zones of the WOC basin. In Turonian to Paleocene time thick-skinned collision and thrusting took place south and south-west (in the recent coordinates) of the Silesian Basin causing very rapid, diachronous uplift of this zone, referred to as Silesian Ridge, resulting with high deposition rate in the Silesian Basin. At that time supply of sediments to the Magura Basin from south was relatively low, and the Pieniny Klipen Belt was presumably zone of transfer of these sediments. In Eocene the zone of collisional shortening in the WOC system was relocated to the south, causing rapid uplift of the Southern Magura Ridge and intense supply of detritus to the Magura Basin. Thrusting in the Southern Magura Ridge and collisional compression resulted with flexural bending of its broad foreland, being the reason for decrease of activity of both the Silesian Ridge and the source area at the northern rim of the WOC. The Eocene evolution of the Silesian Ridge is interpreted as controlled by both episodic tectonic activity and eustatic sea level changes. Contrasting development of the Southern Magura Ridge and the northern rim of Central Carpathians during Eocene stands for a palaeographic distance between the two domains at that time. During Oligocene and early Miocene a significant increase of deposition rates is observed for the basin in which sediments of the Krosno beds were deposited. This was caused by tectonic uplift of the source at the northern rim of the WOC, as well as the Silesian Ridge and the partly formed Magura nappe. The Miocene molasse of the WOC foredeep basin is characterised by notably higher maximum deposition rates than ones calculated for the flysch deposits of the WOC.
Źródło:
Przegląd Geologiczny; 2006, 54, 10; 878-887
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Późnoneogeńska aktywność tektoniczna w centralnej części zapadliska przedkarpackiego (Witów koło Nowego Brzeska)
Late Neogene tectonic activity of the central part of the Carpathian Foredeep (Witów near Nowe Brzesko, South Poland
Autorzy:
Rauch-Włodarska, M.
Zuchiewicz, W.
Włodarski, W.
Powiązania:
https://bibliotekanauki.pl/articles/2074427.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
zapadlisko przedkarpackie
aktywność tektoniczna
struktura tektoniczna
seria witowska
South Poland
Carpathian Foredeep
Miocene–Pliocene molasses
Late Vistulian loessial complex
small-scale tectonic
Opis:
Normal faults of different orientations appear to be the youngest manifestations of faulting in the Carpathian Foredeep which is filled with Lower to Middle Miocene sediments. Structural studies of the Late Miocene–Pliocene(?) fresh-water molasses of the Witów Series and the overlying Late Pleistocene loessial complex provide a possibility to reconstruct the Late Neogene to Recent (?) stress field in the central part of the Polish Carpathian Foredeep. Strata of such a young age are very rare in the foredeep, thus providing a key record of structural deformation during the latest stages of orogenic evolution of the Carpathian orogen. The molasses are cut by joints, and normal and strike-slip faults, formed in two successive events: (1) a syn-depositional one for the molasses (Late Miocene–Pliocene?), proceeding under NNW–SSE to N–S-oriented horizontal compression, possibly coeval with reactivation of a NE-striking sinistral fault of the Kurdwanów–Zawichost Fault Zone in the basement; (2) a post-depositional one for the molasses (Pliocene to Middle Pleistocene) during N–S to NE–SW-oriented extension, and (3) both syn- and post-depositional ones for the loessial complex (Late Pleistocene). In the first event, reactivation of the NE-striking sinistral fault led to formation of N–S-oriented joints, as well as NW-striking dextral, and NNW-trending normal faults. In the second event, both W–E and NW–SE – oriented joints andWNW-striking normal faults were formed. The latter most probably originated due to reactivation of the Early Palaeocene WNW- and NW-striking normal faults in the basement. In the third event, both NE–SW and NW–SE-oriented joints and NE-striking normal faults formed as a result of reactivation of the SW- and WSW-striking faults in the basement. Therefore, normal faults detected in the Carpathian Foredeep appear to be a result of different successive events. This extensional episode lasted at least to the Late Pleistocene. We also provide evidence for the recent, N- to NNE-directed, tectonic compressive stress, typical for that segment of the Carpathian arc. This stress resulted in the formation of an orthogonal system of joints striking N–S and W–E, produced during
Źródło:
Przegląd Geologiczny; 2006, 54, 11; 943-952
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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