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    Wyświetlanie 1-3 z 3
    Tytuł:
    Depositional environment of the Bagh-e-Vang Formation – the only occurrence of upper Lower Permian in Iran
    Autorzy:
    Yegane, Bizhan Yousefi
    Van Loon, A.J. (Tom)
    Fard, Sakine Arefi
    Farahpour, Mohammad Mehdi
    Sharahi, Safoora Yasbolaghi
    Powiązania:
    https://bibliotekanauki.pl/articles/1841615.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    limestones
    microfacies analysis
    transgression conglomerate
    barrier deposits
    lagoonal environment
    Tabas Block
    wapienie
    analiza mikrofacjalna
    konglomerat
    transgresja
    osady
    laguna
    Opis:
    A transgression of the Tethys Ocean occurred in east central Iran, like in other areas of the Tethys Ocean, around the Yakhtashian/Bolorian (regional chronostratigraphical units corresponding with the Artinskian/Kungurian of the Early Permian) transition. This led to the development of a carbonate platform that is represented in the Shirgesht area on the northern part of the Tabas Block by the Bagh-e-Vang Formation, which constitutes the only known sedimentary unit from the late Early Permian in Iran. Field data and thin-section analysis indicate deposition on a carbonate ramp with barriers separating a lagoonal area with intertidal mud flats from the open-marine environment. The overall transgres-sive development is indicated by the presence of open-marine sediments on top of the barrier and lagoonal sediments.
    Źródło:
    Geologos; 2021, 27, 1; 1-14
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza mikrofacjalna dolomitu głównego (Ca2) we wschodniej części wielkopolskiej platformy węglanowej
    Microfacies analysis of the Main Dolomite (Ca2) in the eastern part of the Wielkopolska Carbonate Platform (W Poland)
    Autorzy:
    Krzyżak, Ewelina
    Powiązania:
    https://bibliotekanauki.pl/articles/2075967.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    basen permski
    główny dolomit cechsztyński
    Ca2
    platforma węglanowa
    analiza mikrofrakcji
    Permian Basin
    Zechstein Main Dolomite
    carbonate platform
    microfacies analysis
    Opis:
    Investigation of the Permian Basin in the western part of the Polish Lowland was initiated in 1961 when the Rybaki field was discovered - the first one outside the Carpathians in Poland. The Main Dolomite (Ca2) in the eastern part of the Wielkopolska Platform, located in western Poland, is characterized by a significant variety of microfacies, hence this research is aimed at better interpretation and understanding of depositional environments of current reservoir rocks as well as possibility of identification of facies distribution within the investigated carbonate platform. A detailed microfacies analysis of the Main Dolomite was conducted, which was supported by core logging. The author interpreted depositional environments and generated a 3D model of the top of the Main Dolomite using seismic reflection data. An attempt to correlate microfacies between the analyzed wells was also performed. Integrated analyses of thin sections and drill cores from 4 wells allowed me to interpret the depositional environments of the Main Dolomite. The generated 3D model of the top of the Main Dolomite provided a better insight into subsurface tectonics, paleogeography of the analyzed area and a better understanding of depositional lithofacies environments.
    Źródło:
    Przegląd Geologiczny; 2019, 67; 172--175
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental method for estimation of compaction in the Oxfordian bedded limestones of the southern Kraków-Częstochowa Upland, Southern Poland
    Autorzy:
    Kochman, A.
    Matyszkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/139080.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    differential compaction
    oedometer test
    basin analysis
    microfacies
    Upper Jurassic
    Kraków-Częstochowa Upland
    kompakcja
    badania edometryczne
    analiza
    dorzecze
    mikrofacje
    jura późna
    Wyżyna Krakowsko-Częstochowska
    Opis:
    The Upper Jurassic carbonates exposed in the southern part of the Kraków-Częstochowa Upland are well known for their significant facies diversity related to the presence of microbial and microbial-sponge carbonate buildups and bedded detrital limestone in between. Both the buildups and detrital limestones revealed differential susceptibility to compaction which, apart from differential subsidence of the Palaeozoic basement and synsedimentary faulting, was one of the factors controlling seafloor palaeorelief in the Late Jurassic sedimentary basin. The compaction of the detrital limestones has been estimated with an experimental oedometric method in which specially prepared mixtures made of ground limestones from a quarry in the village of Żary were subjected to oedometer tests. The diameters of the detrital grains and their percentages in the limestones were determined by microscopic examinations of thin sections. The diameters were assigned to predetermined classes corresponding to the Udden-Wentworth scale. The rock samples were then ground down to the grain sizes observed in thin sections. From such materials, mixtures were prepared of grain size distributions corresponding to those observed in thin sections. After adding water the mixtures were subjected to oedometer tests. Analysis of the compression of such mixtures under specific loads enabled preparation of a mathematical formula suitable for the estimation of mechanical compaction of the limestone. The obtained values varied from 27.52 to 55.53% for a load corresponding to 300 metres burial depth. The most significant effect of mechanical compaction was observed for loads representing only 2 metres burial depth. Further loading resulted in a much smaller reduction in sample height. The results of the oedometer tests cannot be used directly to determine compaction of the detrital limestones. Mainly because microscopic observations of thin sections of the experimental material show that chemical compaction was also an important factor influencing thickness reduction of the limestones.
    Źródło:
    Acta Geologica Polonica; 2013, 63, 4; 681-696
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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