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    Wyświetlanie 1-3 z 3
    Tytuł:
    Sedimentary environment and tectonic controls of the Snochowice Beds (Lower Jurassic, western margin of the Holy Cross Mountains, Poland)
    Autorzy:
    Kozłowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058989.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Lower Jurassic
    gravels
    clast-rich debris flows
    streamflow dominated alluvial fans
    tectonic control
    Opis:
    The Snochowice Beds represent the lowermost part of the Lower Jurassic succession in the western part of the Mesozoic margin of the Holy Cross Mountains (Central Poland). This thick, gravelly has a different lithological character to other Lower Jurassic sandy and fine-grained deposits. Eight lithofacies have been distinguished, mainly gravelly and sandy, grouped into four genetic associations: M – massive gravels, interpreted as clast-rich debris flow deposits, G – horizontally to cross-stratified gravels, interpreted as gravelly bars and bedforms, S – cross-stratified and massive sandstones, interpreted as sandy bars and bedforms and F – massive mudstones and claystones, generally fine-grained deposits, interpreted as overbank deposits. Analysis of depositional geometry and lithofacies successions allowed reconstruction of the sedimentary environment: landforms of alluvial fan type, formed mainly by braided river processes and rarely by sediment gravity flows. A decrease in the thickness and content of gravelly lithofacies towards the north and north-east is documented. Analysis of transport directions has revealed that the clastic material was transported toward the north and north-east, perpendicular to the main faults fringing the basin. Depositional geometry facies and palaeocurrent patterns of the Snochowice Beds indicate that sedimentation was controlled by tectonic activity.
    Źródło:
    Geological Quarterly; 2012, 56, 2; 299-314
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Late Cretaceous - Early Palaeogene sandy-to-gravelly debris flows and their sediments in the Silesian Basin of the Alpine Tethys (Western Outer Carpathians, Istebna Formation)
    Autorzy:
    Strzeboński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059835.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    flysch Carpathians
    Silesian Nappe
    Istebna Formation
    deep-water sedimentary environment
    sediment gravity flows
    debris flows
    siliciclastic deposits
    debrites
    depositional system
    apron
    Opis:
    The study focuses on Upper Cretaceous - Palaeocene deposits from the Beskid Śląski mountain range in southern Poland constituting the Istebna Beds. The Istebna Beds, also referred to as the Istebna Formation, are part of the Silesian tectonic unit, which forms the Outer Carpathian fold-and-thrust belt (part of the Alpine-Carpathian system). The results of qualitative and quantitative lithological-sedimentological studies were the basis for the interpretation of lithofacies types, sedimentary processes and palaeoenvironment as well as for the reconstruction of the architecture of the depositional system. The analysis conducted on the basis of field description of the deposits shows the prevalence (nearly 70%) of siliciclastic strata representing a sandstone-conglomerate association (S-C), which is the main subject of this work. The S-C lithofacies: sandstones, gravelly sandstones, sandy conglomerates and conglomerates constitute the deposits formed mostly by mass gravity-flows such as sandy-to-gravelly debris flows. The distribution of the coarse-clastic material indicates a sediment supply from southerly directions and implies the presence of an active source area in the rear part of the Silesian Basin. A succession of the sandstone-to-conglomerate deposits with the secondary participation of other lithofacies, with a thickness of approximately two thousand metres, indicates temporary increased diastrophic activity in the Silesian Ridge (source area) and the intense denudation of this area. The uplift of the alimentation area and its destruction coinciding with enforced relative regression and the uncovering of the proximal depositional zone of the basin led to resedimentation of the older intrabasinal material and repeated mass deposition together with delivery of extraclasts of pre-existing rocks and minerals. The lithofacies development of the sandstone-to-conglomerate debrites and the related sedimentary palaeotransport directions suggest an accumulation domain in the form of a linear apron depositional system developed in a deep-water setting. Experimental modelling of subaqueous sandy flows has contributed to a better understanding of the complex genesis of deep-water sediment gravity flows developing in depositional systems rich in sand material.
    Źródło:
    Geological Quarterly; 2015, 59, 1; 195--214
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Revised holostratigraphy of the Tithonian-Berriasian transition at Tré Maroua (Le Saix, Hautes-Alpes, SE France): study of a rejected Berriasian GSSP candidate
    Autorzy:
    Granier, Bruno R.C.
    Benzaggagh, Mohamed
    Ferry, Serge
    Powiązania:
    https://bibliotekanauki.pl/articles/27324248.pdf
    Data publikacji:
    2023
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    stratigraphy
    calpionellids
    saccocomids
    Tithonian
    Berriasian
    lithoclasts
    erosion
    debris flows
    turbidites
    Vocontian Trough
    stratygrafia
    kalpionellidy
    sakokomidy
    Tytonian
    Berriazjatycki
    litoklasty
    erozja
    spływają śmieci
    turbidyty
    Rynna Wokoncka
    Opis:
    The study of the Tithonian and lower Berriasian succession of Le Saix (Hautes-Alpes, France) has made it possible to better characterize the lithological succession at a former Berriasian GSSP candidate, its set of microfacies, the stratigraphic ranges of the main groups of marine plankton and therefore the calpionellid and saccocomid biozonations. On the lithological level, the Tithonian strata are characterized by thick-bedded breccias representing debris flows and related calciturbidites, whereas the Berriasian strata are typically white limestones. The lower part of the Berriasian is comprised of scattered intercalations of thin-bedded breccias and calciturbitides (including cryptic mud calciturbidites). In thin sections, the white limestones display mud- to wackestone textures and their allochems are mostly tiny bioclasts (e.g., radiolarians, calpionellids, saccocomids). Calciturbidites have wacke- to grainstone textures and their allochems are mostly pseudointraclasts and extraclasts, comprising various bioclasts and some ooids. Mud turbidites are made of micrograin-stones some yielding almost exclusively well-sorted calpionellids, which were previously erroneously interpreted as the signature of “explosions” or “blooms” of Calpionella alpina. Breccias are mostly lithoclastic floatstones with a matrix similar to that of the calciturbid- ites. Their lithoclasts are either extraclasts sensu stricto, i.e., material derived from updip shallow-water areas, or pseudointraclasts representing reworked subautochthonous material, i.e., mud- and wackestone lithoclasts with radiolarians, saccocomids and/or calpionellids. Radiolarians are common over the whole studied interval. Saccocomids are part of the dominating biota reported from the lower and lower upper Tithonian interval whereas calpionellids replace them in the uppermost Tithonian to lower Berriasian interval. Minor plank- tonic groups comprise calcareous dinoflagellates and Globochaete alpina; Iranopsis nov. group is also present. Intervals with saccocomid sections characteristic of zones 4-5 and zone 6 are respectively ascribed here to the lower Tithonian (4-5) and the lower upper Tithonian (6). The biozonation of the calpionellid group sensu lato allows identification of i) the Boneti Subzone of the chitinoidellids, ii) the Cras- sicollaria Zone, more specifically its Tintinnopsella-Intermedia (A1), Intermedia-Alpina (A2) and Brevis-Massutiniana (A3) subzones, and iii) the Alpina Zone, with its Alpina-Parvula (B1) and its Alpina-Remaniella (B2) subzones. On the basis of biostratigraphical and sedimentological data, most zonal boundaries prove to be hiatal, located at the erosional base of breccia or turbidite layers whereas the Tithonian/Berriasian stage boundary appears to be located at a strike-slip fault plane in the Tré Maroua section.
    Źródło:
    Volumina Jurassica; 2023, 21; 1--18
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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