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    Wyświetlanie 1-7 z 7
    Tytuł:
    Ordovician ostracods from East Central Iran
    Autorzy:
    Ghobadi Pour, M.
    Williams, M.
    Vannier, J.
    Meidla, T.
    Popov, L.E.
    Powiązania:
    https://bibliotekanauki.pl/articles/22059.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    geographic setting
    Iran
    Ordovician
    Ostracoda
    Shirgesht Formation
    brachiopod
    geological setting
    ostracod
    paleontology
    trilobite
    systematics
    ostracod fauna
    biogeography
    stratigraphy
    Opis:
    Ordovician ostracods are described for the first time from Iran, enhancing the record of this group from the Lower Palaeozoic of the Middle East. The ostracods occur in the Shirgesht Formation, in the east central part of the country, and comprise Ogmoopsis achaemenid sp. nov., Cerninella aryana sp. nov., Ordovizona amyitisae sp. nov., cf. Aechmina? ventadorni, Vogdesella sp., and podocope taxa tentatively identified as species of Longiscula, Pullvillites, and Rectella. These taxa were hitherto unknown from this region. The ostracod−bearing interval is associated with trilobites (Neseuretinus) and brachiopods (Nicolella) that suggest a late Middle Ordovician age. Although the ostracod fauna is small, it demonstrates biogeographical links at genus−level, and possibly at species−level, with the fauna of the late Middle Ordovician Travesout Formation of western France, which also lay in a peri−Gondwanan palaeogeographical setting. It also suggests the potential use of some ostracods as stratigraphical tools for correlating Ordovician rock successions between Europe and the Middle East.
    Źródło:
    Acta Palaeontologica Polonica; 2006, 51, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Late Svecofennian sedimentary basins in the crystalline basement of NE Poland and adjacent area of Lithuania: ages, major sources of detritus, and correlations
    Autorzy:
    Krzeminska, E.
    Wiszniewska, J.
    Skridlaite, G.
    Williams, I. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059225.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Fennoscandia
    Sarmatia
    Greenland
    Svecofennian basin
    detrital zircon
    geochronology
    Opis:
    The Pre cam brian base ment of Lith u a nia and NE Po land, much of which is metasedimentary paragneiss, can be ac cessed only by cores from deep bore holes. Ion microprobe dat ing of de tri tal zir cons from sam ples of these meta sedi ments and the geo chem i cal sig na tures of the rocks pro vide new in sights into their age and prov e nance. De tri tal zir cons from meta sedi ments from Jastrzebna and Monki have Pb iso to pic ages in the ranges 3.14–1.83 and 3.53–1.82 Ga, re spec tively. Sim i lar re sults have been ob tained from the Lith u a nian Lazdijai and Bliudziai paragneisses. About 30% of the ana lysed Pol ish de tri tal zir con cores are of Late Archaean age (2.90–2.60 Ga) and about 70% are Palaeoproterozoic (2.10–1.90 Ga), sim i lar to the age dis tri bu tions of de tri tal zir con from Svecofennian meta sedi ments ex posed in Cen tral Swe den and South ern Fin land. The youn gest de tri tal zir con sub-groups in di cate max i mum de po si tion ages of about 1.86 Ga, sim i lar to the ages of ex posed Svecofennian sed i men tary bas ins. Pos si ble source rocks of com pa ra ble ages and af fin i ties can be found within Fennoscandia, Green land and Sarmatia.
    Źródło:
    Geological Quarterly; 2009, 53, 3; 255-272
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rewizja wieku "najstarszych" skał w podłożu krystalicznym północno-wschodniej Polski
    Revision of the "oldest" rocks age in the crystalline basement of NE Poland
    Autorzy:
    Krzemińska, E.
    Wiszniewska, J.
    Williams, I.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074437.pdf
    Data publikacji:
    2006
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    pegmatyt
    monacyt
    ziarna cyrkonu
    mikroskopia elektronowa
    wysokopróżniowy mikroskop skaningowy
    zircon
    monazite
    U-Pb SHRIMP geochronology
    Late Paleoproterozoic
    NE Poland
    Opis:
    The oldest geochronological results between 2.69–2.57 Ga was previously obtained by using K–Ar method on biotite from pegmatite from Jastrzębna IG–1 borehole. In consequence, in many published reports up to 1998, the Mazowsze (or Masovian) granitoid massif has been regarded as Archean age structure. Therewithal, other rocks in the area, e.g. Bargłów gneiss sequence traditionally were described as Archean in age. In the paper we present new U–Pb SHRIMP zircon and monazite results for above mentioned rocks which have been considered as Archean. Cathodoluminescence images and SHRIMP analysis were carried out for zircons and monazites from Jastrzebna IG–1 pegmatite of 514 m depth (a historical sample previously dated by K–Ar method) and for zircon magmatic cores from Bargłów IG–2 orthogneiss of the 708 m depth. The obtained U–Pb ages of 1826 š12 Ma (zircon) and 1789š34 Ma (monazite), and 1835š28 Ma (zircon) for two rock samples respectively have shown Paleoproterozoic origin. Only 4 of the 24 analysed zircons have clearly discordant results, which are all from the Jastrzebna pegmatite, where Pb–loss was possible (in partially metamict U–rich zircon grains). The new U–Pb SHRIMP dating indicates that Jastrzębna pegmatite and Bargłów magmatic protolith of the orthogneiss is only Late Paleoproterozoic in age and in general about 700 Ma younger than previously reported by K–Ar method. Therefore, there is no unequivocal evidence of the presence of Archean rocks in crystalline basement of NE Poland. This study has been undertaken as a part of a collaborative research agreement between the Polish Geological Institute and Geochronology and Isotope Geochemistry Research School of Earth Sciences of the Australian National University in Canberra.
    Źródło:
    Przegląd Geologiczny; 2006, 54, 11; 967-973
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wczesnokarboński wiek intruzji platformowych w podłożu krystalicznym NE Polski
    Early Carboniferous age of the cratonic intrusions in the crystalline basement of NE Poland
    Autorzy:
    Krzemińska, E.
    Wiszniewska, J.
    Williams, I.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074482.pdf
    Data publikacji:
    2006
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    zircon
    U-Pb SHRIMP geochronology
    closure temperature
    mafic-alkaline magmatism
    Early Carboniferous
    NE Poland
    Opis:
    Three mafic-alkaline intrusive bodies in NE Poland: Ełk, Pisz and Tajno, have been dated recently with U-Pb SHRIMP method. An earlier Rb-Sr whole rock isochron of Ełk syenites pointed to an age 355š4 Ma, while K-Ar age estimates suggested a Late Paleozoic age of Pisz and Tajno rocks, however, in a wide range between 349-291 Ma and 327-289 Ma, respectively. In the paper, we present new geochronological results and discuss the problem of the closure temperatures for different minerals and different isotopic systems used in previous age determinations. Much of the early dating works has been done using K-Ar method. Biotite and K-feldspar retain radiogenic Ar quantitatively below 280 -200şC. Only if magmatic bodies cooled quickly and remained unmetamorphosed, K-Ar and Rb-Sr ages estimate accurately the intrusion emplacement. Zircon used for U-Pb datings has a closure temperature over 800şC, that is comparable to the temperature of magma’s solidus. Therefore U-Pb magmatic zircons dates could be interpreted as an intrusion emplacement ages. The obtained U-Pb results of 347.7 š8 Ma (Ełk) and 345.5š5 Ma (Pisz) have shown very consistent Early Carboniferous age of platform mafic-alkaline magmatic activity. This new U-Pb SHRIMP dating indicates that Ełk and Pisz intrusions are coeval and together with the Tajno alkaline-carbonatite massif could be affined with the Late Devonian Kola Alkaline Carbonatite Province (KACP).
    Źródło:
    Przegląd Geologiczny; 2006, 54, 12; 1093-1098
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Epitaxially Induced Defects in Sr- and O-doped La$\text{}_{2}$CuO$\text{}_{4}$ Thin Films Grown by MBE: Implications for Transport Properties
    Autorzy:
    Locquet, J.-P
    Williams, E. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964235.pdf
    Data publikacji:
    1997-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Nn
    74.62.Fj
    81.15.Hi
    74.72.Dn
    Opis:
    In this paper, the critical role played by various types of defects and strain relaxation mechanisms in high-T$\text{}_{c}$ thin films is highlighted and illustrated with examples. The defects are essential for providing adequate diffusion channels for oxygen ingress during the cooling step in c-axis thin films. The operation of strain relaxation mechanisms necessitated by the lattice mismatch between film and substrate can impose a compressive or tensile biaxial pressure, which either increases or reduces the critical temperature.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 1; 69-84
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A mysterious giant ichthyosaur from the lowermost Jurassic of Wales
    Autorzy:
    Martin, J.E.
    Vincent, P.
    Suan, G.
    Sharpe, T.
    Hodges, P.
    Williams, M.
    Howells, C.
    Fischer, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/23272.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    ichthyosaur
    deposit
    morphotype
    Jurassic
    Wales
    Opis:
    Ichthyosaurs rapidly diversified and colonised a wide range of ecological niches during the Early and Middle Triassic period, but experienced a major decline in diversity near the end of the Triassic. Timing and causes of this demise and the subsequent rapid radiation of the diverse, but less disparate, parvipelvian ichthyosaurs are still unknown, notably because of inadequate sampling in strata of latest Triassic age. Here, we describe an exceptionally large radius from Lower Jurassic deposits at Penarth near Cardiff, south Wales (UK) the morphology of which places it within the giant Triassic shastasaurids. A tentative total body size estimate, based on a regression analysis of various complete ichthyosaur skeletons, yields a value of 12-15 m. The specimen is substantially younger than any previously reported last known occurrences of shastasaurids and implies a Lazarus range in the lowermost Jurassic for this ichthyosaur morphotype.
    Źródło:
    Acta Palaeontologica Polonica; 2015, 60, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silurian myodocope ostracods from Poland
    Autorzy:
    Perrier, V.
    Olempska, E.
    Siveter, D.J.
    Williams, M.
    Legiot, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/22910.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    Newly collected material reveals that the Silurian myodocope ostracods from the Holy Cross Mountains, Poland comprise ten species (one new to science) belonging to four families: Bolbozoidae, Entomozoidae, Rhomboentomozoidae, and Cypridinidae. Biostratigraphic control using graptolites indicates that all three Polish outcrops investigated are of about the same chronostratigraphical level: middle Gorstian, lower Ludlow. The new occurrences in Poland extend the known distribution of several species and reinforce data that show many Silurian myodocope species with wide dispersal. Our new observations on the Holy Cross Mountains material confirm that the occurrences of Silurian myodocopes are mostly associated with pelagic animals and with rocks ranging from mudstone, siltstone or shale deposited in open- or deep-shelf marine settings. The cosmopolitan distribution of these ostracods, coupled with their facies and faunal associations, supports the notion of an ostracod (myodocope) ecological shift from benthic to planktonic habitats during the late Wenlock and Ludlow.
    Źródło:
    Acta Palaeontologica Polonica; 2019, 64, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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