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Wyszukujesz frazę "Sandstone" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Sedimentary record comparison of the Piwniczna and Poprad sandstones (Magura Unit, Outer Carpathians) : a study from the border area of eastern Slovakia and Poland
Autorzy:
Dirnerová, D.
Farkašovský, R.
Powiązania:
https://bibliotekanauki.pl/articles/2060081.pdf
Data publikacji:
2018
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Outer Carpathians
Magura Unit
Piwniczna Sandstone Member
Poprad Sandstone Member
facies analysis
thin-section analysis
Opis:
Thick deep-water sandstone successions are known from many localities in the Outer Western Carpathians. The present study is focused on comparison of deposits of the Piwniczna (PwSM) and Poprad (PpSM) Sandstone members belonging to the Magura Formation of the Magura Unit, outcropping in the eastern Slovakia and Poland border area. At the general level, a close similarity of the sandstone successions was confirmed by this study. However, in more detail, facies analysis shows differences in the thickness of the sandstone successions, in grain size and in the character of intervals between the thick sandstones. Thin-section study, though, showed almost the same modal composition in the sandstones analysed. The sandstone successions studied are interpreted as sandy debrites, the PwSM showing transitional facies to turbidites. These deposits rep resent channelized depositional lobes in the proximal part of a submarine fan with the PpSM closer to the source. The sediment source area was common to both lithostratigraphic units, and was most likely the South-Magura Ridge.
Źródło:
Geological Quarterly; 2018, 62, 4; 881--895
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sole structures as a tool for depositional environment interpretation : a case study from the Oligocene Cergowa Sandstone, Dukla Unit (Outer Carpathians, Slovakia)
Autorzy:
Dirnerová, D.
Janočko, J.
Powiązania:
https://bibliotekanauki.pl/articles/2059973.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
sedimentology
sole structures
flow properties
Dukla Unit
Cergowa sandstone
Western Carpathians
Opis:
Sole structures, typically developed on basal bedding surfaces of turbidite sandstones, are commonly used as palaeocurrent indicators and indicators of the current ability to erode. Detailed analysis of types and frequency of sole structures in the 128 m thick succession of Early Oligocene Cergowa Sandstone (Outer Western Carpathians) also shows their potential as an indicator of flow condition during the deposition. The massive and amalgamated sandstones, predominantly containing load casts and minor flutes and grooves with unidirectional orientation, are suggested to be deposited by highly turbulent flow after reaching hydraulic jump behind the topographic obstacle. High range of sole structures in thick and medium thick sandstones, suggesting inferior oblique and reverse flows, implies deposition from density stratified flows where lower, denser part has a tendency to deflect when hit the basin floor obstacle. The upper, less dense part has an ability to come over the obstacle and shows only small scatter in the palaeocurrent direction.
Źródło:
Geological Quarterly; 2014, 58, 1; 41--50
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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