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    Wyświetlanie 1-6 z 6
    Tytuł:
    Nowe doniesienia z wnętrza Ziemi
    New reports from the Earth inside
    Autorzy:
    Grabarczyk, Anna
    Wiszniewska, Janina
    Ruszkowski, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/2075894.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    płaszcz Ziemi
    rdzeń Ziemi
    bridgemanit
    Ca-perowskit
    ringwoodyt
    ferro-peryklaz
    Earth Mantle
    Earth Core
    bridgemanite
    Ca-perovskite
    ringwoodite
    ferri-periclase
    Opis:
    A new research has been done on the high pressure minerals from the Earth’s Mantle Transition and Lower Zone. The Earth’s Mantle extends from the “Moho” (Mohoroviè) discontinuity down to a depth of 2,900 km and constitutes 83% of the Earth’s volume and 67% of its mass.The mantle is further divided into two seismic regions: the upper and thelower mantle separated by a seismic zone of discontinuity at a depth of 670 km, which is also the maximum depth to which subducted lithospheric plates can reach. The additional discontinuity zone, i.e. a depth of 410 km together with a zone of 670 km, corresponds to the transformation site of the silicate mineral structure, which also affects the speed of propagation of seismic waves. Mantle peridotite samples indicate that olivine is the main component of the uppermost part of the upper mantle, up to adepth of 410 km. At greater depths, down to 660 km, in the so-called Transition, transformation of olivine into its high-pressure poly-morphs (wadsleyite and ringwoodite) showing a spinel structure, is observed. Experimental research data on natural bridgmanite((Mg, Fe)SiO3), which exhibits a perovskite structure and is the main mineral of the lower mantle and the most common mineral in the Earth, have been presented. The problem of nitrogen and water amounts in the Earth’s lower mantle and a content of new iron polymorphs in the Earth’s core have also been discussed.
    Źródło:
    Przegląd Geologiczny; 2019, 67, 10; 812--816
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Permian trepostome bryozoans from the Zechstein Main Dolomite (Ca2) of Western Poland and NE Germany
    Autorzy:
    Hara, U.
    Ernst, A.
    Mikołajewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059208.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Western Poland
    NE Germany
    Bryozoa
    Zechstein
    Main Dolomite (Ca2)
    taxonomy
    Opis:
    The trepostome bryozoan Dyscritella microstoma Ernst, 2001 is reported for the first time from the Zechstein Main Dolomite (Ca2) of Poland and Germany. This species has been previously recognized in the older fossiliferous Zechstein Lime stone (Ca1) of the North Sudetic Basin (Poland) and in the northern part of Germany. The Polish specimens derive from a few boreholes located in the Pomerania region and in the Wolsztyn High, both in the western part of Poland. The German material comes from a borehole on Rügen Island in North eastern Germany. The present paper deals with the taxonomic description of D. microstoma and its distribution in the Main Dolomite deposits.
    Źródło:
    Geological Quarterly; 2009, 53, 2; 249-254
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A U/Pb age for the Mygatt-Moore Quarry, Upper Jurassic Morrison Formation, Mesa County, Colorado
    Autorzy:
    Trujillo, K.
    Foster, J.
    Hunt-Foster, R.
    Chamberlain, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2077340.pdf
    Data publikacji:
    2014
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Morrison Formation
    U-Pb dating
    CA-TIMS
    dinosaurs
    North American Jurassic
    Formacja Morrisona
    dinozaury
    Opis:
    Mygatt-Moore Quarry in the Brushy Basin Member of the Upper Jurassic Morrison Formation is one of the more important large dinosaur quarries in the formation, yielding fossils of sauropod dinosaurs including Apatosaurus, Camarasaurus, and an indeterminate diplodocine (cf. Diplodocus or Barosaurus), the theropod dinosaurs Allosaurus and Ceratosaurus, and the ornithischians Othnielosaurus and Mymoorapelta. Fossil wood and carbonized plants are known from the deposit, and carbonized dinosaur skin has also been discovered. We report here on a new U/Pb radiometric age for the Mygatt-Moore Quarry, from a smectitic mudstone collected at the quarry horizon. We isolated zircons using an ultrasonic separation technique and standard heavy liquid and magnetic methods, analyzed single zircons using a chemical abrasion method (CA-TIMS). The age determined for this dinosaur quarry, 152.18 ±0.29 Ma, places the quarry at the boundary between the Kimmeridgian and Tithonian stages of the Late Jurassic Period. This age can now be used to place the quarry into stratigraphic position with respect to other dated horizons in the Morrison Formation and other rock units worldwide. We will also use this age along with other ages to create a radiometrically based stratigraphic framework for the Morrison Formation.
    Źródło:
    Volumina Jurassica; 2014, 12, 2; 107--114
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessing the reliability of foraminiferal Mg/Ca thermometry by comparing field-samples and culture experiments: a review
    Autorzy:
    Kontakiotis, G.
    Mortyn, G. P.
    Antonarakou, A.
    Drinia, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059914.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Mg/Ca palaeothermometry
    core-top sediments
    sediment traps
    plankton tows
    laboratory culture experiments
    palaeoceanography
    Opis:
    Trace elements incorporated into foraminiferal test carbonate are commonly used as palaeoproxies. For instance, benthic and planktonic Mg/Ca ratios are frequently used for reconstructing bottom and sea surface temperature (SST) changes, respectively. However, over the past few decades it has been shown that the incorporation of Mg2+ into foraminiferal calcite is controlled by more than one environmental parameter, with significant variations of their sensitivities between culture and field-based studies. Opinions differ as to whether the laboratory conditions during culturing experiments or the natural conditions during field sampling (core-tops, sediment traps and plankton tows) better trace the wealth of information with improved accuracy. Laboratory culture experiments that isolate the effects of individual environmental parameters have been used to identify secondary controls on Mg uptake into planktonic foraminifer tests. However, field-based data (core-top sediments and plankton tows) from high salinity super-saturated settings have shown the additional presence of high-Mg inorganic precipitates leading to significant salinity (S) biases on the Mg/Ca palaeothermometer. Testing such synergistic effects between temperature, salinity and calcite saturation state would require an experimental design where all these parameters are varied systematically, but such experiments have yet to be conducted. Since the synergistic effects cannot presently be ruled out through culturing experiments, it is imperative to initially confirm the amplitude and geographic distribution of the detectable diagenetic precipitations (Scanning Electron Microscopy analysis) through field-based work, further quantify their importance (discrimination of distinct diagenetic stages and quantification of the diagenetic imprint) and finally estimate its potential effect on Mg/Ca-T calibration (e.g., overgrowth-corrected species-specific calibration equations). The example of the marginal high-salinity settings, among others, clearly highlights that the optimal use of Mg/Ca as a palaeotemperature proxy urgently requires the complementarity of both culture- and field-based data. To this end, we here present advantages and disadvantages to each approach. These insights reinforce the potential of the combined use of culture- and field-based foraminiferal studies, where possible, in order to minimize the observed inconsistencies, and to advance Mg/Ca thermometry by both providing a framework for better understanding the nature of Mg/Ca dependence on seawater temperature, and the effects of complicating factors.
    Źródło:
    Geological Quarterly; 2016, 60, 3; 547--560
    1641-7291
    Pojawia się w:
    Geological Quarterly
    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:
    New stratigraphic scheme for Zechstein rocks in the Pogorzela High (Foresudetic Monocline) and its significance for hydrocarbon exploration
    Autorzy:
    Kwolek, K.
    Mikołajewski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2066027.pdf
    Data publikacji:
    2007
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    monoklina przedsudecka
    Wolsztyn
    cechsztyn
    Pogorzela
    dane sejsmiczne 3D
    Fore Sudetic Monocline
    Wolsztyn High
    Pogorzela High
    Zechstein Limestone (Ca1)
    3D seismics
    Opis:
    Results of an analysis of new 3D seismic data, obtained from the part of the Wolsztyn High in the Pogorzela High area (SW Poland), allow to test the existing knowledge regarding the geologic framework of the Zechstein rocks in this area. A characteristic arrangement of seismic reflectors within pinched-out Zechstein deposits on slopes of the high shows that they are overlapped in relation to the distinct surface of angular unconformity related to the base of the Zechstein-the Z1'seismic boundary. 3D seismic data seems to show that PZ1 strata are absent in the close vicinity of the Pogorzela High with the lower part of the PZ2 cyclothem also absent across the crest. This suggests that the interpretation of the stratigraphy of Zechstein deposits in the Pogorzela-1 and Pogorzela-2 wells (located on the crest of the high) is, in the light of 3D seismic data, questionable. Probably, the initial stages of the Zechstein transgression did not reach the most elevated part of the high, so that the Carboniferous basement is directly overlain by rocks of the Main Dolomite (Ca2), not by the Zechstein Limestone (Ca1) as was previously thought. The lack of Ca1 strata across the crest of the Pogorzela High opens new exploration perspectives in this interval and explains the apparent negative results of boreholes drilled in 1970s. Presumably it also explains differences in formation of these rocks in comparison with the central and western part of the Wolsztyn High (the Kościan-Nowy Tomyśl area).
    Źródło:
    Przegląd Geologiczny; 2007, 55, 12/1; 1037-1047
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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