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    Wyświetlanie 1-8 z 8
    Tytuł:
    Mesoarchean melt and fluid inclusions in garnet from the Kangerlussuaq basement, Southeast Greenland
    Autorzy:
    Nicoli, Gautier
    Gresky, Kerstin
    Ferrero, Silvio
    Powiązania:
    https://bibliotekanauki.pl/articles/2086561.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Mineralogiczne
    Tematy:
    melt inclusions
    Precambrian
    Greenland
    Opis:
    The present work reports the first anatectic melt inclusions found so far in the Mesoarchean basement in East Greenland. Using optical microscope observations and MicroRaman spectroscopy, we show that garnets in metasedimentary migmatite contain primary polycrystalline aggregates which can be confidently interpreted as former droplets of anatectic melt, i.e. nanogranitoids. In some cases, they coexist with coeval fluid inclusions under conditions of primary fluid-melt immiscibility. The re-evaluation of the metamorphic pressure and temperature conditions with up-to-date phase equilibria modelling, combined with the identification of nanogranitoids and fluid inclusions, suggests metamorphic peak equilibration and partial melting in presence of a COH-fluid at T ~1000°C and P > 7 kbar. To date, this is the oldest verified occurrence of nanogranitoids and fluid-melt immiscibility during garnet growth in a partially molten environment.
    Źródło:
    Mineralogia; 2022, 53, 1; 1--9
    1899-8291
    1899-8526
    Pojawia się w:
    Mineralogia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seismic refraction investigations in Poland (1964-1978) and their use in continuing studies
    Autorzy:
    Młynarski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059904.pdf
    Data publikacji:
    2002
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Precambrian Platform
    Palaeozoic Platform
    Carpathians
    refraction seismic surveys
    Opis:
    Seismic refraction investigations, performed in Poland between 1964 and 1978, are reviewed. Examples selected from the many seismic profiles, totalling approximately 15 000 km in length, are shown. The most useful profiles as regards geological interpretation are in the Precambrian Platform and along its southwestern edge. Both the top of the crystalline basement and a system of faults, downfaulting the basement towards the south-west, can be identified in that area. In the Carpathians and its foreland, the top of this basement may be identified together with the bases of thrust flysch nappes. In the Fore-Sudetic Monocline, the top of folded Carboniferous deposits can be determined. The most ambiguous results were obtained from the Palaeozoic Platform.
    Źródło:
    Geological Quarterly; 2002, 46, 3; 247-254
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Precambrian and Lower Paleozoic of the Brunovistulicum (eastern part of the Upper Silesian Block, southern Poland) : the state of the art
    Autorzy:
    Jachowicz-Zdanowska, M.
    Buła, Z.
    Habryn, R.
    Żaba, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060621.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Precambrian basement
    Lower Paleozoic sedimentary cover
    Upper Silesian Block
    Brunovistulicum
    southern Poland
    Opis:
    The Precambrian basement and Lower Paleozoic (Cambrian–Ordovician) sedimentary cover in the eastern part of the Upper Silesian Block (Brunovistulicum), known only in boreholes, is presented, and their palaeogeographic, facies and palaeotectonic development is discussed. The former is characterized by a heterogeneous structure that consists of Archean-Lower Proterozoic and Neoproterozoic rocks of different lithologies and origins, and the latter is almost exclusively represented by marine, transitional and terrestrial siliciclastic rocks. In contrast to the neighbouring region of the western part of the Małopolska Block, the siliciclastic sedimentation took place during the Early and Middle Cambrian in this area, however, the Ordovician deposits were encountered in several boreholes and no Silurian rocks have been reported in the northern part of this region. The authors present the most probable model of sedimentation, tectonics and origin of the geological structure of the Lower Paleozoic sedimentary cover in the Upper Silesian Block, define research problems, and justify the need for new drillings. Based on the geological and structural analysis of the depth to the top surface of the Lower Paleozoic, they define the optimal location for three 1500 m deep boreholes to solve the basic research problems.
    Źródło:
    Geological Quarterly; 2015, 59, 1; 123--134
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sedimentation and tectonics of the Upper Proterozoic-Lower Cambrian deposits of the Southern Małopolska Massif (SE Poland)
    Autorzy:
    Moryc, W
    Łydka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059374.pdf
    Data publikacji:
    2000
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Carpathian Foreland
    Tarnów-Przemyśl area
    Precambrian
    sedimentation
    lithology
    basement tectonics
    clastic rock
    Opis:
    In the latest Precambrian and Early Cambrian, turbidity currents and cohesive flows transported pebbles, sand and mud into a deep water in south-east Poland, this sediment probably being sourced from Gondwana. Abundant detrital albite grains suggest volcanism during sedimentation. Pebbles in conglomerate interbeds are polymict and include rock fragments showing greenschist facies regional metamorphism in the source area. The Precambrian surface in the marginal part of the Carpathians lies at 2000-5000 m b.s.l., whereas farther south, around Kuźmina it reaches 7000 m. Still farther south (Krosno-Sanok-Baligród) geophysical evidence suggests it lies at about 17-20 km depth.
    Źródło:
    Geological Quarterly; 2000, 44, 1; 47-58
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A hitherto unknown river type from the Archaean at Bhurkuli (Jharkhand, E India)
    Autorzy:
    van Loon, A. J.
    De, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/94253.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    conglomerates
    fluvial system
    pebble characteristics
    Precambrian
    Singhbhum Craton
    zlepieńce
    system fluwialny
    charakterystyka żwirkowa
    prekambr
    Opis:
    The Archaean granitoid pluton of the Singhbhum craton in E India is overlain by Archaean to Palaeoproterozoic metasediments. These sediments are still poorly known and their stratigraphy is under debate. Several scattered, most probably Meso- to Neoarchaean, conglomerates are present in the state of Jharkhand that differ so much in characteristics that they are probably not related to each other. The sedimentology of a series of conglomerate patches and layers near Bhurkuli has been investigated, including the characteristics of the clasts. It is deduced on the basis of these characteristics and the sedimentological context that the Bhurkuli conglomerates represent the channel facies of a river system that differed from the types of fluvial systems that exist nowadays.
    Źródło:
    Geologos; 2017, 23, 2; 109-122
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digital rock models of Precambrian and Paleozoic tight formations from Poland
    Autorzy:
    Krakowska, P. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060584.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    digital rock models
    Precambrian sedimentary rocks
    Paleozoic sedimentary rocks
    petrophysical parameters
    statistical analysis
    petrophysical data
    Opis:
    Properties of selected Precambrian and Paleozoic sedimentary clastic rocks were analysed with respect to their reservoir potential. Multidimensional analysis of laboratory results and borehole logging data was used to construct digital models of pre-Mesozoic, deeply buried formations, present as tight, low-porosity and low-permeability rocks. This modern statistical and deterministic approach as applied to laboratory and borehole logging results worked to integrate data at different scales. The results obtained are useful not only in further scientific research but also found a use in industrial application. As a first step, statistical methods, including clustering and separation of homogeneous groups, enabled digital rock model creation on the basis of the results of such laboratory measurements as pycnometry, mercury porosimetry, nuclear magnetic resonance spectroscopy or computed X-ray tomography. Next, the models constructed were applied in borehole logging interpretation to find intervals with similar petrophysical properties within the group and different properties between the groups. This approach allowed implementation of upscaling procedures of laboratory experiments at micro- and nano-scale to borehole logging scale. High correlations were established between the log petrophysical parameters within the digital models. This approach can be used to divide the succession cored into intervals with different petrophysical parameters.
    Źródło:
    Geological Quarterly; 2017, 61, 4; 896--907
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Total Specific Energy (TSE) as a new indicator of drilling efficiency
    Autorzy:
    Toczek, P.
    Wiśniowski, R.
    Stryczek, S.
    Ziaja, J.
    Mazur, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/299082.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    selection of drill bits
    Precambrian platform
    mechanical specific energy
    drilling unit cost
    mechanical efficiency index
    TSE - total specific energy
    Opis:
    Knowing the data from drilling works which had been carried out in a given area gives the opportunity to develop the next borehole with great precision. An important element of the design is to analyze and interpret data in detail, which can be used during the following drilling process. Based on a literature analysis, certain methods of the selection of drill bits have been indicated. Mechanic specific energy curves of drill bits applied in drilling works in northern Poland have been compared. The drilling works took place in the Precambrian platform. The compared mechanic specific energy curves were calculated with the use of R. Teale and H. Rabia equations. A relation between mechanical specific energy and pressure loss in polycrystalline diamond compact drill bits was determined. New drilling ratio TSE - Total Specific Energy which considers hydraulic power energy in the nozzles of the drill bit was calculated.
    Źródło:
    AGH Drilling, Oil, Gas; 2017, 34, 3; 715-729
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mapa geologiczna podłoża krystalicznego polskiej części platformy wschodnioeuropejskiej : podsumowanie projektu badawczego
    Geologic map of crystalline basement in the Polish part of the East European Platform : a summary of the study
    Autorzy:
    Krzemiński, L.
    Krzemińska, E.
    Petecki, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075147.pdf
    Data publikacji:
    2014
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    East European Craton
    Precambrian
    Polska
    geologic map
    U-Pb age
    wschodnioeuropejski kraton
    prekambrian
    Polska
    mapa geologiczna
    wiek U-Pb
    Opis:
    A new geologic map of the crystalline basement of NE Poland has been constrained on the basis of the magnetic and gravity imaging, data from seismic profiles of POLONAISE'97 and CELEBRATION'2000, and extensive geochemical, isotopic and U-Pb dating studies of drill core samples. This updated reconstruction of the hidden southwestern margin of the East European Craton revealed of several late Svecofennian orogenic domains with ages in the range 2.0–1.74 Ga, belonging to the Fennoscandia. The age of these Paleoproterozoic domains is becoming regionally younger towards NW. Furthermore, there is two Paleoproterozoic domains, which form integral part of the westernmost youngest rim of the Sarmatia block. During the early Mesoproterozoic between 1.54 and 1.45 Ga intracratonic plutons of the AMCG suite intruded a large area of the Mazury-Warmia, Pomorze and SE Baltic region. Several deep-sourced ultramafic-alkaline bodies of Early Carboniferous age (354–338 Ma) are related to the youngest magmatic event.
    Źródło:
    Przegląd Geologiczny; 2014, 62, 6; 288--289
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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