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    Tytuł:
    Autocykliczny rozwój oksfordzkich bioherm gąbkowo-mikrobialitowych centralnej i południowej Polski
    Autocyclic development of Oxfordian sponge-microbial bioherms from Central and Southern Poland
    Autorzy:
    Ostrowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2077309.pdf
    Data publikacji:
    2005
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    biohermy gąbkowo-mikrobialitowe
    Polska
    sponge-microbial bioherms
    Oxfordian
    Polska
    Opis:
    A study of Upper Jurassic sponge-microbial bioherms in Poland allow to recognise successive changes in bioherm facies. No-time related character of these changes proved for different bioherms excludes external mechanism of facies development. The existance of ecological co-dependence between sponge and cynaobacteria may be treated as main reason of facies changes.
    Źródło:
    Volumina Jurassica; 2005, 3, 1; 45-53
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pressure dissolution features in Oxfordian microbial-sponge buildups with pseudonodular texture, Kraków Upland, Poland
    Autorzy:
    Matyszkiewicz, J.
    Kochman, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/191583.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    pressure dissolution features
    pseudonodularity
    microbial-sponge buildups
    Oxfordian
    southern Poland
    Opis:
    Part of the Oxfordian carbonate buildups in the southern part of the Kraków Upland is developed as pseudonodular limestones, which represent segment reefs. These limestones are composed of connected, rounded-oval to subangular carbonate pseudonodules. The pseudonodules, densely packed within the limestone, fall out easily under mechanical stress. The recently observed texture of pseudonodular limestones resulted from two stages of chemical compaction. During the first stage, in the Late Jurassic, high-amplitude and low-amplitude stylolites and dissolution seams were formed. The sites particularly favourable for the development of high-amplitude stylolites were the boundaries between already lithified fragments of the laminar, rigid microbial-sponge framework. The low-amplitude stylolites formed mainly in the intercalated wackestone-packstone, which was lithified somewhat later; hence, the dissolution seams originated at the contacts between the rigid microbial-sponge framework and the wackestonepackstone. After Early Cretaceous erosion, which decreased the burial load, Late Cretaceous sedimentation enabled the renewal of pressure dissolution. Thus, some low-amplitude stylolites evolved into dissolution seams. In stylolites composed of both low- and high-amplitude segments, dissolution proceeded at the bases of interpenetrating high-amplitude stylolite columns, with the simultaneous transformation of low-amplitude stylolite segments into dissolution seams. These seams, which formed at the initial stage of chemical compaction, were subjected in turn to further pressure dissolution, giving rise to the formation of horsetail structures. The vertical stress field, which triggered the pressure dissolution processes, presumably resulted in the formation of high-angle and vertical incipient tension gashes. At the beginning of the processes, these gashes remained closed. In the Cenozoic, under the extensional regime generated by overthrusting Carpathian flysch nappes, some high-angle and vertical dissolution seams and low-amplitude stylolites opened up, forming deformed dissolution seams and deformed stylolites. Under the same conditions, the high-angle and vertical tension gashes opened up as well. Subsequently, during the exposure period, unloading fractures developed, partly as a result of the opening of some subhorizontal and horizontal dissolution seams and stylolites. The unloading fractures, along with the already existing vertical and high-angle tension gashes, formed the network changing the limestone into pseudonodules of various shapes and sizes. The open spaces between the limestone fragments became local conduits for karst waters.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2016, 86, 4; 355-377
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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