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    Wyświetlanie 1-7 z 7
    Tytuł:
    Foraminifera from the Late Jurassic and Early Cretaceous carbonate platform facies of the southern part of the Crimea Mountains, Southern Ukraine
    Autorzy:
    Krajewski, M.
    Olszewska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/191714.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    foraminifers
    dinoflagellata
    Upper Jurassic
    Lower Cretaceous
    Crimea
    Opis:
    Upper Jurassic and Lower Cretaceous deposits of the Crimea Peninsula are rich in microfossils frequently used for stratigraphic interpretations. In case of foraminifera, the research has been carried predomi- nantly on assemblages obtained by washing the rock samples. The present paper is based on investigations of thin sections from the more indurated sediments that seldom were objects of study. Its goal was to obtain additional information on age and environment of sediments studied. Over 250 thin sections from 16 surface outcrops yielded abundant foraminifera from which over fourty are described herein. Many foraminiferal species (e.g., Labirynthina mirabilis, Parurgonina caelinensis, Neokilianina rahonensis, Amijella amiji, Anchispirocyclina lusitanica) are stratigraphically significant and known from the Kimmeridgian-Tithonian of the Mediterranean Tethys. The Early Cretaceous fauna is represented by Protopeneroplis ultragranulata, Everticyclammina kelleri, Nautiloculina bronnimanni, Monsalevia salevensis, and Mayncina bulgarica. Generally, the investigated fauna is typical for paleoenvironment of the carbonate platform. Older (Kimmeridgian-Tithonian) assemblages represent the inner, and younger (Berriasian) outer parts of the platform. Palaeogeographic distribution of many species described from the studied area indicates their affiliation with cosmopolitan biota known from the north Tethyan shelf. Additionally, few calcareous cysts of Dinoflagellata have been identified and described.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2007, 77, No 3; 291-311
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lithology and morphology of Upper Jurassic carbonate buildups in the Będkowska Valley. Kraków region, Southern Poland
    Litologia i morfologia górnojurajskich budowli węglanowych w rejonie Doliny Będkowskiej, region krakowski
    Autorzy:
    Krajewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/191276.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    carbonate buildups
    microfacies
    Upper Jurassic
    Kraków region
    southern Poland
    Opis:
    Upper Jurassic limestones exposed in the Będkowska Valley form an extensive complex of carbonate buildups of microbolite-sponge and microbolite-Tubiphytes reef-like bioherms, in which the main rock-building material are packstone and grainstone bound by microbolite structures. Horizontal discontinuity surfaces locally found in massive limestones are of sedimentary origin and are related to sediment gravity flows from the higher parts of the buildups. Two basic morphological types of carbonate buildups are distinguished in the vertical sequence of studied sediments: (i) one or a couple of large buildups forming a continuous biolitite cover with one type of sediment prevailing over a wide area in the lower part and passing upwards to (ii) numerous small buildups separated by depressions filled with packstone and grainstone formed from erosion of the buildups. The smaller, younger buildups were subject to early cementation which led to formation of extensive constructions.
    Górnojurajskie wapienie Doliny Będkowskiej tworzą rozległy kompleks budowli węglanowych typu bioherm mikrobolitowo-gąbkowych i mikrobolitowo-Tubiphytesowych bioherm rafopodobnych, w których podstawową rolę skałotwórczą odgrywają ziarnity wiązane przez struktury mikrobolitowe. Poziome powierzchnie nieciągłości obserwowane niekiedy w wapieniach masywnych posiadają genezę sedymentacyjną związaną z drobnodetrytycznymi spływami z wyższych partii budowli. W badanych osadach można wydzielić dwa podstawowe typy morfologiczne budowli: (i) rozwinięte jako jedna lub kilka dużych budowli tworzących zwartą pokrywę biolitytową charakteryzującą się szerokim rozprzestrzenieniem jednego typu sedymentacji, (ii) oraz liczne ale niewielkie budowle, między którymi, w nieckach, osadzały się ziarnity pochodzące z erozji tych budowli. Budowle te wraz z otaczającymi je ziarnitami uległy wczesnej cementacji tworząc większe, złożone konstrukcje.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2000, 70, 2; 151-163
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Upper Jurassic chalky limestones in the Zakrzówek Horst, Kraków, Kraków-Wieluń Upland (South Poland)
    Górnojurajskie wapienie kredowate zrębu Zakrzówka w Krakowie, Wyżyna Krakowsko-Wieluńska, południowa Polska
    Autorzy:
    Krajewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/191182.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    carbonate buildups
    microfacies
    background sedimentation rate
    Upper Jurassic
    Kraków
    southern Poland
    Źródło:
    Annales Societatis Geologorum Poloniae; 2001, 71, No 1; 43-51
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Facies of the Upper Jurassic–Lower Cretaceous deposits from the southern part of the Carpathian Foredeep basement in the Kraków–Rzeszów area (southern Poland)
    Autorzy:
    Krajewski, M.
    Matyszkiewicz, J.
    Król, K.
    Olszewska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/191393.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    facies
    microfacies
    dolomitization
    Upper Jurassic
    Lower Cretaceous
    Carpathian Foredeep basement
    southern Poland
    Opis:
    A comparative sedimentological analysis of the Upper Jurassic–Lower Cretaceous deposits carried out on drill-cores from the southern part of the Carpathian Foredeep allowed us to distinguish thirteen main microfacies types. The results of microfacies analyses and stratigraphical data made it possible to propose a lithological subdivision of the southern part of the Upper Jurassic and Lower Cretaceous sediments of the Carpathian Foredeep basement between Kraków and Rzeszów. In the analysed wells, three main sedimentary complexes were distinguished, embracing the following intervals: (i) Callovian–Oxfordian, (ii) Kimmeridgian and (iii) Tithonian– Berriasian–Valanginian. The Oxfordian, Kimmeridgian and Tithonian deposits represent the outer – mid homoclinal ramp facies, whereas the Berriasian and Valanginian deposits belong to the inner homoclinal ramp facies. Complexes of microbial-sponge reefs, with a distinct relief, could be recognised in the Upper Oxfordian sediments only. The development of these buildups took place in a basin typified by diversified morphology, determined by the block-type structure of the Palaeozoic basement and synsedimentary tectonics, which brought about substantial variability in thickness of the Oxfordian sediments. At the end of the Oxfordian, large complexes of the reef facies were replaced mainly by microbial-sponge and microbial-coral biostromes developed during the Kimmeridgian and Tithonian. In the principal part of the studied area (except the western part of the described fragment of the Carpathian Foredeep; Kraków area) during the Kimmeridgian, Tithonian, Berriasian and Valanginian, sedimentation occurred in a basin typified by homogeneous morphology, which resulted in a wide extent and comparable thicknesses of the distinguished facies types. In the studied sections, indications of partial or complete dolomitization were observed in a large part of the sediments. Four generations of dolomite document a complex diagenetic history with multiple episodes of dolomite formation: from early diagenetic environment to late burial conditions.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2011, 81, No 3; 269-290
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lower Kimmeridgian layer with bored and encrusted hiatus concretions (Upper Jurassic, Central Poland) : implications for stratigraphy and basin evolution
    Autorzy:
    Krajewski, M.
    Olchowy, P.
    Felisiak, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/191944.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    calciturbidites
    hardground
    synsedimentary tectonism
    hiatus concretions
    borings
    encrustations
    marker horizon
    Upper Jurassic
    Central Poland
    Opis:
    The paper presents a comparative analysis of a Lower Kimmeridgian layer with bored and encrusted hiatus concretions collected in three study areas, located in Central Poland. These studies demonstrate distinct similarities between the hiatus concretions in terms of their origin, development and stratigraphic position. The layer with its characteristic concretions seems to represent an important marker horizon for the Lower Kimmeridgian successions in Central Poland. The identification of this marker horizon in drill cores and exposures could be important for definition of the stratigraphic position of the sediments, which otherwise lack appropriate biostratigraphic information. The matrix of the concretions is composed of pelagic calciturbidites, which reflect flooding of the early Kimmeridgian platform. These sediments were lithified early and formed a hardground. The origin of the hiatus concretions probably is related to erosion of the hardground, followed by redeposition and several phases of exhumation and erosion, preceding final burial. The characteristic ecological successions, observed in the concretions, document an evolution from soft to firm and hard marine substrates, typical of hardgrounds and evidenced by various burrows, borings (Gastrochaenolites, Trypanites), and epizoans. Calciturbidite sedimentation, hardground erosion and redeposition of the hiatus concretions, known from deposits of the Platynota Zone in Central Poland, were associated with synsedimentary activity of the Holy Cross Fault, on the NE margin of the extensive, tectonic Małopolska Block.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2014, 84, 2; 113-129
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Facies of the Upper Jurassic–Lower Cretaceous sediments in the basement of the Carpathian Foredeep (western Ukraine)
    Autorzy:
    Krajewski, M.
    Król, K.
    Olszewska, B.
    Felisiak, I.
    Skwarczek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/191397.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    microfacies
    Upper Jurassic
    Lower Cretaceous
    SW margin of the East-European Platform
    Carpathian Foredeep basement
    Western Ukraine
    Opis:
    The Upper Jurassic–Lower Cretaceous carbonate sediments developed in a narrow, Ukrainian part of the basement of the Carpathian Foredeep show high facies diversity. Based upon thin section studies, the authors identified eleven principal microfacies varieties. Three main stages of development of carbonate platform were distinguished: (i) Oxfordian–Early Kimmeridgian, (ii) Kimmeridgian–Tithonian, and (iii) Berriasian–Valanginian. The Oxfordian sediments are rather thin and represent both the outer and inner, distally steepened ramp facies. In the Late Kimmeridgian and, mainly, in the Tithonian, the intensive growth of rimmed platform took place with distinct zones of peritidal, margin barrier and platform slope, bearing calciturbidite facies. Development of the rimmed platform was controlled by synsedimentary tectonic movements along faults rejuvenated southwest of the Holy Cross Mts. Fault Zone. In the Berriasian–Valanginian, the dominant process was sedimentation onto not-rimmed platform controlled by small sea-level changes. Both the facies development and literature data indicate that the Late Jurassic sedimentation in the Ukrainian part of the Carpathian Foredeep basement shows considerable differences in comparison to that of the Polish part. In the studied successions, large Oxfordian microbial-siliceous sponge reef complexes, known from the Polish part of the Carpathian Foredeep basement and other areas in Europe, were rare. In the study area carbonate buildups were encountered mainly in the intervals representing the Upper Kimmeridgian–Tithonian where small, microbial-sponge and microbial-coral biostromes or patch-reefs were formed. Their growth was presumably restricted to a narrow zone of the upper slope, close to ooidal-bioclastic margin platform facies. In the Polish part of the Carpathian Foredeep basement, the Late Jurassic sedimentation took place on a vast, homoclinal ramp while in the Ukrainian part it proceeded on a narrow, distally steepened ramp and rimmed platform with distinct marginal platform barrier. Similar platform facies distribution in both regions appeared mainly in the Early Cretaceous, although with some stratigraphical differences. The facies distribution of the Upper Jurassic sediments was closely controlled by the block structure of the basement and by orientation of the main, transcontinental Holy Cross Mts. Fault Zone, which supports the opinion on its activity in the Mesozoic era. The Ukrainian part of the Carpathian Foredeep basement located over the Palaeozoic Kokhanivka Block, between the Krakovets and Holy Cross fault zones, includes predominantly the slope, marginal and inner platform facies. Facies observed over the Palaeozoic Rava Ruska Block (south-western part of the East-European Platform), between the Holy Cross and Rava Ruska fault zones, represents mainly the inner platform and the peri-shore deposits.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2011, 81, No 3; 291-307
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Epigenetic silicification of the Upper Oxfordian limestones in the Sokole Hills (Kraków-Częstochowa Upland): relationship to facies development and tectonics
    Autorzy:
    Matyszkiewicz, J.
    Kochman, A.
    Rzepa, G.
    Gołębiowska, B.
    Krajewski, M.
    Gaidzik, K.
    Żaba, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/138902.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Upper Jurassic limestones
    epigenetic silicification
    tectonic deformations
    Kraków-Częstochowa Upland
    wapienie górnej jury
    deformacje tektoniczne
    Wyżyna Krakowsko-Częstochowska
    Opis:
    A spectacular epigenetic silicification was encountered in the Oxfordian bedded limestones exposed in the Sokole Hills situated in the Kraków-Częstochowa Upland. The main epigenetic mineral is microcrystalline quartz accompanied by minor goethite, hematite, barite, galena and sphalerite. Locally, the mineralized limestones reveal Pb and Cu contents exceeding over 150 times the background values of these metals in unmineralized limestones. The epigenetic mineralization of the bedded limestones was probably a two-stage process. During the first, Early Cretaceous stage, silicified limestones formed at the erosional surface of a denuded carbonate complex. Such silicification greatly limited the progress of the first karstification phase of the Upper Jurassic carbonates initiated in the Hauterivian. The sources of silica accumulated in the limestones were descending solutions enriched in silica derived from the weathering zone. This silicification affected the topmost part of the Upper Jurassic massive limestones and the deeper portions of the bedded limestones along the fracture systems and stylolites. Early Cretaceous tectonic activity generated new dislocations and re-opened the existing faults, which were subsequently filled with permeable Albian quartz sands. These openings became the migration pathways for ascending, warm, relict, sulphide-carrying hydrothermal solutions at the second formation stage of the epigenetic mineralization. The newly supplied silica from the Albian sands precipitated on the silicified limestones and, as concentric rims, on brecciated, early diagenetic cherts. The second-stage mineralization proceeded under phreatic conditions, presumably close to a fluctuating mixing zone of ascending, warm hydrothermal solutions and descending cold groundwaters. The brecciated cherts acting as silica crystallization nuclei indicate that the last mineralization stage probably followed the final phase of Cenozoic faulting.
    Źródło:
    Acta Geologica Polonica; 2015, 65, 2; 181-203
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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