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    Wyświetlanie 1-6 z 6
    Tytuł:
    Microbial laminites with coprolites from Upper Jurassic carbonate buildups (Kraków-Częstochowa Upland, Poland)
    Autorzy:
    Kochman, A.
    Matyszkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/191932.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    microbialites
    coprolites
    carbonate buildups
    nutrients
    synsedimentary tectonics
    Oxfordian
    Opis:
    The Upper Oxfordian microbial-sponge agglutinated to open-frame reef complex of the Zegarowe Crags in the Kraków-Częstochowa Upland originated upon an elevation of the Late Jurassic stable northern shelf of the Tethys. This elevation was formed, owing to a local decrease in subsidence rate during Jurassic time, induced by the presence of a Palaeozoic granitoid intrusion in the shelf substratum, and Late Jurassic, synsedimentary tectonics, which controlled the topography of the sea bottom. The Zegarowe Crags (Skały Zegarowe) complex at the top contains microbial laminites, composed of peloidal and agglutinated stromatolites, and intercalations of grainstones with indeterminable, favrenoid coprolites, occurring in large numbers. The development of stromatolites was associated with low nutrient availability. In contrast, the periodic activity of crabs, the main producers of the coprolites, forming the coprolitic grainstone intercalations, indicates periods, when nutrients were abundant in the sea water. The nutrinets most likely were associated with the occurrence of clouds of suspended matter, induced by gravity flows, generated by active, synsedimentary tectonics. The results of isotopic studies do not support the presence of warm, mineralizing solutions, connected with synsedimentary tectonics during development of the Zegarowe Crags complex in the Late Jurassic.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2012, 82, 4; 331--347
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New dimorphic species of the genus Rollierites Jeannet from southern Poland
    Autorzy:
    Jain, Sreepat
    Mazur, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2055870.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Rollierites
    dimorphism
    Callovian
    Oxfordian
    Jurassic
    Ogrodzieniec Quarry
    Polska
    Opis:
    A new ammonite assemblage from the lower beds of the Ogrodzieniec Quarry (southern Poland), the only Callovian section in the middle part of the Polish Jura Chain, is described. It includes the presence of Kosmoceras rotundum (Quenstedt), followed by the first example of co-occurring micro- and macroconchs in the genus Rollierites (R. biplicatum sp. n.) and above it, the association of Euaspidoceras sp. and Peltoceratoides (Parawedekindia) gerberi Prieser. Both R. biplicatum sp. n. (m and M; microconch and macroconch) and K. rotundum are assigned to the late Callovian Lamberti Zone. P. (P.) gerberi characterizes the early Oxfordian Cordatum Zone. This is the first record of the genus Rollierites from Poland. This study extends the upper age limit of the middle Callovian Rollierites up to the late Callovian Lamberti Zone. On the basis of morphological and stratigraphical data, it is tentatively proposed that the origin of the early–middle Oxfordian Tornquistes may be in the middle–late Callovian Rollierites, rather than the previously proposed late Callovian Pachyceras. However, this is speculation, as the present data set is insufficient.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2021, 91, 4; 405--418
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early Oxfordian Radiolaria from Zalas quarry, Kraków Upland, South Poland
    Wczesnooksfordzkie promienice z kamieniołomu w Zalasie, Wyżyna Krakowska, Polska południowa
    Autorzy:
    Górka, H.
    Bąk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/191266.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    early Oxfordian
    radiolaria
    Kraków Upland
    biostratigraphy
    taxonomy
    palaeoecology
    Opis:
    This paper presents preliminary research on radiolarian faunas from the Upper Jurassic deposits of the Kraków Upland (South Poland) carried at Zalas quarry. The systematic description of twenty-five species of Radiolaria from the lower Oxfordian deposits has been presented herein. The species belong to the orders Nassellaria (16 species) and Spumellaria (9 species). In number of specimens, the assemblage is dominated by spumellarians. The radiolarians show features of Boreal faunas, influenced by Tethyan realm. The assemblage has been correlated with cordatum ammonitic subzone (early Oxfordian).
    W pracy przedstawiono wstępne wyniki badań promienic (Radiolaria) z utworów górnej jury, prowadzonych na Wyżynie Krakowskiej w kamieniołomie w Zalasie. Przedstawiono opis systematyczny 25 gatunków promienic z dolnego oksfordu. Spośród opisanych form 16 reprezentuje rząd Nassellaria, a 9 należy do rzędu Spumellaria. Pod względem liczby okazów, w zespole przeważają przedstawiciele rzędu Spumellaria. Promienice reprezentują faunę borealną, która żyła w środowisku o znacznym wpływie morza tetydzkiego. Analizowany zespół promienic został skorelowany z podpoziomem amonitowym cordatum (wczesny oksford).
    Źródło:
    Annales Societatis Geologorum Poloniae; 2000, 70, 2; 165-179
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    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
    Tytuł:
    Oxfordian to Valanginian palaeoenviron- mental evolution on the western Moesian Carbonate Platform: a case study from SW Bulgaria
    Autorzy:
    Ivanova, D.
    Kołodziej, B.
    Koleva-Rekalova, E.
    Roniewicz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/191387.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Oxfordian-Valanginian
    biostratigraphy
    carbonate sedimentology
    reefs
    Moesian Platform
    Lyubash unit
    Bulgaria
    Opis:
    Three sections (Rebro, Lyalintsi and Velinovo) of the Upper Jurassic-Lower Cretaceous carbonate sequences from the Lyubash unit (Srednogorie, Balkanides, SW Bulgaria) have been studied for elucidation of biostratigraphy and palaeoenvironmental evolution. Palaeontological studies of foraminifera, supplemented by studies of calcareous dinoflagellate cysts and corals, enabled the determination of the Oxfordian-Valanginian age of the analysed sequences. They were deposited on the Dragoman Block (western part of the Moesian Platform), and during Mid-Late Cretaceous included to the Srednogorie. A possible Middle to Late Callovian age of the lowermost part (overlying the Bajocian-Lower Bathonian Polaten Formation) of the studied sections assumed till now has not been confirmed by the present studies. Eleven facies have been distinguished and attributed to depositional environments. Marine sedimentation on a homoclinal ramp started in the Oxfordian and till the Early Kimmeridgian - in all three sections - was dominated by fine-grained peloidal-bioclastic wackestones to grainstones. Since the Late Kimmeridgian, when a rimmed platform established, facies pattern underwent differentiation into (i) the inner platform (lagoon and tidal flat facies) - only in Velinovo, (ii) reef and peri-reef facies/bioclastic shoals - mainly in Lyalintsi, and (iii) platform slope - mainly in Rebro. Sedimentation generally displays a shallowing-upward trend. Two stages in evolution of the rimmed platform are postulated. The mobile stage lasting till the Tithonian/Berriasian boundary was followed by a more stable stage in the Berriasian to Valanginian time. Reefs are developed mainly as coral-microbial biostromes, lower coral bioherms or coral thickets, in the environment of moderate energy and sedimentation. They contain highly diversified corals (72 species). Micro- bialites contributed to the reef framework, but they never dominated. Locally, microencrusters and cement crusts formed important part of reefal framework. During the mobile stage of the platform evolution a relative sea-level rise interrupted reef development, as evidenced by intercalations of limestones with Saccocoma. During the second stage high carbonate production and/or regressive eustatic events, not balanced by subsidence, decreased accommodation space, limiting reef growth and enhancing carbonate export to distal parts of the platform.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2008, 78, No 2; 65-90
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiolarian faunas from the Late Callovian and Early Oxfordian deposits of the Kraków-Wieluń Upland, South Poland
    Promienice w osadach górnego keloweju i dolnego oksfordu Wyżyny Krakowsko-Wieluńskiej
    Autorzy:
    Smoleń, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/191367.pdf
    Data publikacji:
    2002
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    radiolaria
    Upper Callovian
    Lower Oxfordian
    Kraków-Wieluń Upland
    biostratigraphy
    palae-ecology
    palaeogeography
    Opis:
    This paper presents the result of research on radiolarian faunas from the Upper Callovian and Lower Oxfordian deposits of the Kraków-Wieluń Upland (South Poland). The studied material comes from boreholes Wodna 1, Trzebionka 2 and Trzebionka 3, and from outcrops at Górka near Trzebinia and Grojec. Two radiolarian assemblages, differing markedly in their species contents, I and II, have been identified. Assemblage I occurs in the Upper Callovian deposits. It has been found within Q. lamberti ammonitic Zone. In the number of specimens this association is dominated by the spherical, oval and conical forms of the Nassellaria group. Assemblage II is associated with the Lower Oxfordian deposits and it is characterised by the dominance of spongy radiolarians belonging to the Spumellaria group. Assemblage II has been found within Q. mariae and C. cordatum ammonitic zones. A correlation with the Tethyan radiolarian zones indicates that both assemblages can be assigned to U.A.Z. 8 (Late Callovian trough Early Oxfordian age). The radiolarians show features of Tethyan faunas which spread over epicontinental seas when communication with the Tethys Ocean opened. A change in the character of the radiolarian assemblage in the Lower Oxfordian suggests boreal influences as well as gradual shallowing of the basin.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2002, 72, No 2; 145-161
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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