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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F13%3A10173869%21RIV14-MSM-11310___
rdf:type
skos:Concept n9:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.3140/bull.geosci.1364
dcterms:description
The Castle Conglomerate Unit in the Poruba Member (Early Namurian, Mississippian) is a lithosome composed of coarse-grained sandstones and conglomerates. Its thickness, lithology and extensive area make it unique in the paralic sequence of the Ostrava Formation of the Upper Silesian Basin. The unit was studied on the basis of information from exploratory boreholes, mines and its outcrop at the type locality in the Lucina Valley in Silesian Ostrava. Locally, the unit attains a thickness of up to 115 m (average 24.4 m). Its present-day area is approximately 992 km(2). The axis of the conglomerate facies (with character of interbeds) in the unit has a NNE-SSW alignment and coincides with the axis of the basin's maximum subsidence during the sedimentation of the Poruba Member. The maximum aggregate thickness of the conglomerate facies is 60 m; their present-day area of occurrence is approximately 480 km(2). The Castle Conglomerate Unit represents deposits of a low-sinuosity river system. The upper part of the multistorey channel fill is characterised by channels filled with sand bedforms and occasional bars. Palaeocurrents show a low spread of vectors, primarily to the NNW. The lower part does not crop out; it is known, therefore, only from boreholes. The presence of the unit's coarse-grained clastics inside the basin filling, which is dominated by siltstone and medium-grained sandstone, indicates a major drop in the base level, which is interpreted here as a drop in the sea level. We correlate this event with the major glacio-eustatic sea level drop at 323 Ma that can be connected with the onset of glaciation interval C2 of the Late Paleozoic Ice Age. Because the resolution of available stratigraphic and geochronologic data is not currently sufficient, an alternative explanation of the tectonic origin cannot be ruled out of the discussion and may also be valid in regard to the active Variscan foreland. The Castle Conglomerate Unit in the Poruba Member (Early Namurian, Mississippian) is a lithosome composed of coarse-grained sandstones and conglomerates. Its thickness, lithology and extensive area make it unique in the paralic sequence of the Ostrava Formation of the Upper Silesian Basin. The unit was studied on the basis of information from exploratory boreholes, mines and its outcrop at the type locality in the Lucina Valley in Silesian Ostrava. Locally, the unit attains a thickness of up to 115 m (average 24.4 m). Its present-day area is approximately 992 km(2). The axis of the conglomerate facies (with character of interbeds) in the unit has a NNE-SSW alignment and coincides with the axis of the basin's maximum subsidence during the sedimentation of the Poruba Member. The maximum aggregate thickness of the conglomerate facies is 60 m; their present-day area of occurrence is approximately 480 km(2). The Castle Conglomerate Unit represents deposits of a low-sinuosity river system. The upper part of the multistorey channel fill is characterised by channels filled with sand bedforms and occasional bars. Palaeocurrents show a low spread of vectors, primarily to the NNW. The lower part does not crop out; it is known, therefore, only from boreholes. The presence of the unit's coarse-grained clastics inside the basin filling, which is dominated by siltstone and medium-grained sandstone, indicates a major drop in the base level, which is interpreted here as a drop in the sea level. We correlate this event with the major glacio-eustatic sea level drop at 323 Ma that can be connected with the onset of glaciation interval C2 of the Late Paleozoic Ice Age. Because the resolution of available stratigraphic and geochronologic data is not currently sufficient, an alternative explanation of the tectonic origin cannot be ruled out of the discussion and may also be valid in regard to the active Variscan foreland.
dcterms:title
Castle Conglomerate Unit of the Upper Silesian Basin (Czech Republic and Poland): a record of the onset of Late Mississippian C2 glaciation? Castle Conglomerate Unit of the Upper Silesian Basin (Czech Republic and Poland): a record of the onset of Late Mississippian C2 glaciation?
skos:prefLabel
Castle Conglomerate Unit of the Upper Silesian Basin (Czech Republic and Poland): a record of the onset of Late Mississippian C2 glaciation? Castle Conglomerate Unit of the Upper Silesian Basin (Czech Republic and Poland): a record of the onset of Late Mississippian C2 glaciation?
skos:notation
RIV/00216208:11310/13:10173869!RIV14-MSM-11310___
n9:predkladatel
n10:orjk%3A11310
n3:aktivita
n16:S n16:I n16:Z
n3:aktivity
I, S, Z(MSM0021620855)
n3:cisloPeriodika
4
n3:dodaniDat
n4:2014
n3:domaciTvurceVysledku
n19:6164544
n3:druhVysledku
n13:J
n3:duvernostUdaju
n20:S
n3:entitaPredkladatele
n5:predkladatel
n3:idSjednocenehoVysledku
64393
n3:idVysledku
RIV/00216208:11310/13:10173869
n3:jazykVysledku
n7:eng
n3:klicovaSlova
paleovalley; glaciation; sedimentology; Carboniferous; Mississippian; Upper Silesian Basin; Ostrava Formation
n3:klicoveSlovo
n11:paleovalley n11:Ostrava%20Formation n11:glaciation n11:Mississippian n11:Carboniferous n11:sedimentology n11:Upper%20Silesian%20Basin
n3:kodStatuVydavatele
CZ - Česká republika
n3:kontrolniKodProRIV
[12341B66B3B2]
n3:nazevZdroje
Bulletin of Geosciences
n3:obor
n18:DB
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
5
n3:rokUplatneniVysledku
n4:2013
n3:svazekPeriodika
88
n3:tvurceVysledku
Sivek, Martin Jureczka, Janusz Sedláčková, Lenka Jirásek, Jakub Martínek, Karel
n3:wos
000328207100010
n3:zamer
n14:MSM0021620855
s:issn
1214-1119
s:numberOfPages
22
n21:doi
10.3140/bull.geosci.1364
n8:organizacniJednotka
11310