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    Wyświetlanie 1-11 z 11
    Tytuł:
    Palaeomagnetism of Permian through Early Triassic sequences in central Spitsbergen: contribution to magnetostratigraphy
    Autorzy:
    Nawrocki, J.
    Grabowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059421.pdf
    Data publikacji:
    2000
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Spitsbergen
    Permian-Early
    Triassic
    magnetostratigraphy
    correlation
    Opis:
    A total of 297 samples for palaeomagnetic studies were collected from Upper Gzhelian through Spathian sediments of the Isfjorden area (central Spitsbergen). In spite of extensive Cenozoic remagnetisation the studied rocks yielded palaeomagnetic poles and magnetostratigraphy. Almost all Permian samples were reversely magnetised during Kiaman superchron. Normal-polarity samples appear in the Ufimian and Kazanian sediments. The topmost samples from the Kapp Starostin Formation (Upper Permian) contain reverse polarity. The magnetic polarity record noted in the Early Triassic (Griesbachian-Spathian) sequences is fully convergent with magnetic polarity schemes obtained in the Canadian Arctic and Deltadalen type section.
    Źródło:
    Geological Quarterly; 2000, 44, 2; 109-117
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Buntsandstein magnetostratigraphy from the northern part of the Holy Cross Mountains
    Autorzy:
    Nawrocki, J.
    Kuleta, M.
    Zbroja, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058884.pdf
    Data publikacji:
    2003
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Holy Cross Mountains
    Buntsandstain
    palaeomagnetic pole
    magnetostratigraphy
    Opis:
    Lower and Middle Buntsandstein sediments from the northern part of the Holy Cross Mountains (Central Poland) were studied palaeomagnetically. The obtained palaeomagnetic pole fits well to the Early Triassic segment of the stable European apparent polar wander path. This indicates that there were no detectable horizontal tectonic rotations in this part of the Holy Cross Mountains after the Early Triassic. In the lowermost part of the Buntsandstein sequence (the A0 and A1 units) the basal Triassic normal polarity zone was identified, whereas a reversed polarity dominates in the youngest rocks of the studied sections. This predominantly reversed part can be correlated with the Pomorze Formation (lower part of the Middle Buntsandstein). The correlation of these magnetic polarity records with magnetostratigraphic data from the other parts of the Central European Basin as well as from the Tethyan sections shows that in the studied area, the Permian-Triassic boundary should be placed near the boundary between the Top Terrigenous Series (uppermost Zechstein) and the A0 unit (lowermost Buntsandstein). In the German part of the Central European Basin the Permian–Triassic boundary coincides with the boundary between the Lower and Upper Bröckelschiefer. The Buntsandstein rocks from the localities of Wióry and Sosnowica contain numerous vertebrate tracks. According to the results of magnetostratigraphic correlation they are of Dienerian (Early Triassic) age.
    Źródło:
    Geological Quarterly; 2003, 47, 3; 253-260
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetostratigraphy of the Campanian/Maastrichtian boundary succession from the Middle Vistula River section, Central Poland
    Autorzy:
    Plasota, T.
    Nawrocki, J.
    Walaszczyk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059995.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    magnetostratigraphy
    Campanian-Maastrichtian boundary
    Polska
    Opis:
    The magnetic polarities of the upper Upper Campanian–Lower Maastrichtian interval of the Middle Vistula River composite section (central Poland), were studied. Sixty-six hand-oriented samples for palaeomagnetic studies were taken from the sections of Raj, Raj North, Podole, Kłudzie and Dziurków. The inter-correlation between them is based primarily on bio-events. The sampled rocks generally revealed a very weak magnetic signal, however quite reliable results were obtained. The whole interval studied, well constrained biostratigraphically, is referred to magnetostratigraphic chron C32n. The Campanian–Maastrichtian boundary, placed biostratigraphically in the upper part of the ‘Inoceramus’ redbirdensis inoceramid Zone, is located near the top of the C32n2n Subchron. Thin reversed polarity intervals in the rocks correlated with the C32n2n chron most probably result from their partial remagnetization (maghemitization).
    Źródło:
    Geological Quarterly; 2015, 59, 4; 831--842
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic polarity of Upper Triassic sediments of the Germanic Basin in Poland
    Autorzy:
    Nawrocki, J.
    Jewuła, K.
    Stachowska, A.
    Szulc, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/191782.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    magnetostratigraphy
    Grabowa Formation
    Upper Triassic
    Germanic Basin
    Polska
    Opis:
    Palaeomagnetic results are presented for 205 samples of cores from the Książ Wielkopolski IG-2, Woźniki K1 and Patoka 1 wells, drilled in the Polish part of Germanic Basin. The magnetic polarity stratigraphy is based on the inclination of the characteristic remanent magnetization, isolated in 60% of the total samples and found to be in general agreement with the expected Late Triassic inclination at the sampling sites. A total of 22 magnetozones from the integration of the three records correspond to about 25% of the published polarity zones for the Upper Triassic sediments that were combined in the worldwide composite polarity-time scale. The magne- tic polarity pattern, defined for the Schilfsanstein, fits very well with the one defined in the Tethys area for the upper part of the Julian sub-stage. According to the magnetostratigraphic data, the uppermost part of the Upper Gypsum Beds (equivalent to the Ozimek Member of the redefined Grabowa Formation) and the lowermost part of the Patoka Member, containing the Krasiejów bone-breccia horizon, can be correlated with the latest Tuvalian (~228.5 Ma) or with the middle part of Lacian (~225 Ma). However, if the “Long-Tuvalian” option for the Late Triassic Time Scale is taken into consideration, the parts of these substages mentioned above should be correlated with ~221.5 Ma and ~218.5 Ma, respectively.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2015, 85, 4; 663-674
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isotopic ages of selected magmatic rocks from King George Island (West Antarctica ) controlled by magnetostratigraphy
    Autorzy:
    Nawrocki, J.
    Pańczyk, M.
    Williams, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058738.pdf
    Data publikacji:
    2011
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Antarctica
    King George Island
    magnetostratigraphy
    isotopic ages
    Opis:
    Isotopic and palaeomagnetic studies were carried out in the central part of King George Island. Selected mafic to intermediate igneous rocks were sampled for this purpose. Single-grain U-Pb dating of zircons from basalts to dacites was controlled by a whole rock 40Ar-39Ar data and the magnetostratigraphy. Five magmatic activity phases were distinguished in the SE coast of King George Island. The oldest, late Cretaceous (Campanian) phase represented by basalts of the Uchatka Point Formation are followed by the early to middle Eocene (~53–43 Ma) phase documented by the lava flows whose ages decrease from SW to NE. Next younger magmatic activity phases were recorded by the lava flows or vertical intrusions emplaced in the late Eocene (~37–35 Ma), late Oligocene (~~28-25 Ma) and late Pliocene to Holocene. The early to middle Eocene magmatic activity phase was the most extensive, producing the largest volume of magma in the study area. The new age determinations allow a more precise and credible stratigraphic correlation of the interbeds of sedimentary rocks observed in some places within the magmatic succession. The glacial provenance of the Herv' Cove diamictite is not obvious. It might represent a mountain river environment. Intense volcanic activity could be additional factor modelling the climate conditions of Antarctica in Paleogene
    Źródło:
    Geological Quarterly; 2011, 55, 4; 301-322
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetostratigraphy of the Oligocene Lower Krosno Beds from the Hulskie section (Outer Carpathians in Poland)
    Autorzy:
    Nawrocki, J.
    Malata, T.
    Rosowiecka, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060521.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Outer Western Carpathians
    Krosno Beds
    Jasło limestone
    magnetostratigraphy
    Opis:
    The Oligocene flysch sequence from the Hulskie section in the Polish Outer Carpathians was palaeomagnetically examined. The flysch complex containing the Jasło and Zagórze limestone horizons revealed palaeomagnetic properties sufficient for a magnetostratigraphy to be established. The correlation of the local to the global magnetic polarity scale indicates that the Jasło limestone was deposited very close to the Rupelian and Chattian boundary i.e. ca. 28.4 Ma. In the same way, the age of the Zagórze limestone was defined as close to ca. 27.6 Ma. The entire450 mof studied section was formed between ca. 29 and 26.5 Ma. It implies an average sedimentary ratio of about 18 cm per thousand years. The palaeomagnetic directions from the Hulskie section do not display the Fisher type distribution and do not fit the reversal test and therefore cannot be used for any regional tectonic reconstruction.
    Źródło:
    Geological Quarterly; 2016, 60, 4; 935--942
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geochronology of selected andesitic lavas from the King George Bay area (SE King George Island)
    Autorzy:
    Pańczyk, M.
    Nawrocki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058742.pdf
    Data publikacji:
    2011
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    West Antarctica
    Eocene
    40Ar-39Ar dating
    magnetostratigraphy
    volcanic rocks
    Opis:
    Volcanic rocks from the Lions Rump area, which are the basement for a sequence of glaciomarine sediments of the Polonez Cove Formation, and lava flows from the Turret Point–Three Sisters Point area were sampled for thermogeochronological and palaeomagnetic investigations. Generally, andesitic lavas from King George Bay area consist mainly of clinopyroxene (Ti-augite) orthopyroxene (hyperstene) and plagioclase phenocrysts. The groundmass comprises mostly plagioclase laths, clinopyroxene, titanomagnetite and rare orthopyroxene crystals. However, the modal content, size, shape and distribution of phenocrysts are variable and specific for each sample. The Ar-Ar plateaus ages calculated for lavas from the Lions Rump area are very homogenous and point to middle Eocene age (Lutetian, ~44.5 Ma). The similar and consistent ages for volcanic basement for that area excluded the thesis about separate tectonic evolution of the Warszawa and Kraków blocks at least since the middle Eocene. The lavas from Turret Point and Three Sister Point are younger and were emplaced during the late Eocene (Bartonian/Priabonian: 37.3 š0.4 Ma and Priabonian: 35.35 š0.15 Ma, respectively). The results of isotopic investigations are consistent with magnetic polarities of the rocks indicating that the samples from the Lions Rump area are coeval with the lower part of the C20 polarity chron whereas the sample from Turret Point can be correlated with the upper part of the C17 polarity chron
    Źródło:
    Geological Quarterly; 2011, 55, 4; 323-334
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pliocene age of the oldest basaltic rocks of Penguin Island (South Shetland Islands, northern Antarctic Peninsula)
    Autorzy:
    Pańczyk, M.
    Nawrocki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058747.pdf
    Data publikacji:
    2011
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Antarctica
    Penguin Island
    Pliocene
    40Ar-39Ar dating
    magnetostratigraphy
    basaltic rocks
    Opis:
    The Penguin Island volcano is located on the southern shelf of King George Island (South Shetland Islands, West Antarctica). Its activity is regarded as connected with the opening of the Bransfield Strait. Penguin Island is dominated by a 180 m high basaltic stratocone (Deacon Peak) with a 350 m wide crater containing a small basaltic plug inside and radial dykes, and it has a second principal vent – the Petrel Crater maar – that was formed during a phreatomagmatic eruption about 100 years ago. A low-potassium, calc-alkaline sequence of basaltic lava flows with intercalations of beach deposits (Marr Point Formation) forms the basement of the stratocone. The Marr Point Formation lava flows have never been dated before. Combined whole rock 40Ar-39Ar isotopic dating and magnetostratigraphy were applied for this purpose. We obtained an isotopic 40Ar-39Ar plateau age of 2.7 š0.2 Ma, and together with the palaeomagnetic data, middle Pliocene age (Piacenzian) is implied for the basaltic plateau of Penguin Island.
    Źródło:
    Geological Quarterly; 2011, 55, 4; 335-344
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integrated palynostratigraphy and magnetostratigraphy of the Middle and Upper Buntsandstein in NE Poland : an approach to correlating Lower Triassic regional isochronous horizons
    Autorzy:
    Becker, Anna
    Fijałkowska-Mader, Anna
    Nawrocki, Jerzy
    Sobień, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2059689.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Buntsandstein
    Lower Triassic
    northeastern Poland
    palynostratigraphy
    magnetostratigraphy
    Opis:
    Despite years of research, Lower Triassic deposits of the epicontinental Central European Basin still lack a detailed stratigraphy that would allow regional correlation of isochronous horizons. The best chronostratigraphic results have up to now been achieved by microspore-based biostratigraphy and magnetostratigraphy. Integrated palynostratigraphic and magnetostratigraphic investigations, carried out on Buntsandstein cores from northeastern Poland representing the eastern margin of the basin, have made precise correlations with the better-explored basin centre. The Lidzbark and Malbork formations of the Bartoszyce IG 1 borehole were examined by means of palynology and palaeomagnetic studies. Further palaeomagnetic studies were applied to the Lidzbark, Malbork and Elbląg formations of the Nidzica IG 1 borehole and the Elbląg Fm. of the Pasłęk IG 1. Two spore-poll en assemblages were distinguished representing the Densoisporites nejburgii Subzone of the D. nejburgii Zone within the lower part of the Lidzbark Fm. and the lowermost part of the Malbork Fm. Mostly reversed polarity was detected within the lower part of the succession investigated, whereas normal polarity prevailed within its upper part. A normal polarity local zone was correlated with the undivided Tbn6-Tbn7 standard magnetozones of western Poland. The reversely polarized part of the succession corresponds most probably to the Tbr5 standard magnetozone. The base of the Tbn6-Tbn7 magnetozone can serve as a good correlation horizon for regional reconstructions.
    Źródło:
    Geological Quarterly; 2020, 64, 2; 460--479
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetostratigraphy of the Buntsandstein (Lower Triassic) in the Gorzów Wielkopolski IG 1 borehole, eastern German Basin in Poland: evidence of substantial diachronism of palynostratigraphic macrospore zones
    Autorzy:
    Becker, A.
    Nawrocki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059722.pdf
    Data publikacji:
    2014
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Buntsandstein
    magnetostratigraphy
    Gorzów Wielkopolski IG 1
    Triassic
    Western Poland
    Opis:
    Palaeomagnetic research on the lower and middle Buntsandstein section of the Gorzów Wielkopolski IG 1 borehole, located in middle western Poland, showed the possibility of existence of short reversed subzones within the first normal polarity zone of the lowermost Buntsandstein (magnetozone Tbn1). The earlier established magnetozones Tbn2 and Tbn4 were not detected. The stratigraphic gap between the middle and upper Buntsandstein included at least magnetozones Tbn6 and Tbr6. The magnetostratigraphic correlation between the investigated section and the Otyń IG1 section indicates a substantial diachronism of palynostratigraphic zones based on macrospores in the lowermost and middle Buntsandstein.
    Źródło:
    Geological Quarterly; 2014, 58, 2; 369--378
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Keuper magnetostratigraphy in the southern Mesozoic margin of the Holy Cross Mts. (southeastern edge of the German Basin)
    Autorzy:
    Wójcik, K.
    Kołbuk, D.
    Sobień, K.
    Rosowiecka, O.
    Roszkowska-Remin, J.
    Nawrocki, J.
    Szymkowiak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060586.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Triassic
    Keuper
    German Basin
    Holy Cross Mountains
    magnetostratigraphy
    rock magnetism
    Opis:
    Magnetostratigraphy of the Keuper succession in the southern Mesozoic margin of the Holy Cross Mountains is presented based on investigations of two sections of Brzeziny and Wolica. They cut an ~60 m thick succession of variegated siltstones and claystones, which overlies the Reed Sandstone (Stuttgart Formation). The succession has been correlated with the Patoka Member of the Grabowa Formation, defined in the Upper Silesia region as an equivalent of the Steinmergelkeuper (Arnstadt Formation). The primary Late Triassic magnetization was obtained from component B carried by fine-grained haematite. Twelve magnetic polarity zones, six of normal and six of reversed polarity, have been defined. The obtained polarity pattern corresponds to the Norian (E13–E16 Newark zones) according to the Long-Rhaetian option of the Late Triassic Magnetic Polarity Time Scale. The mean normal polarity characteristic direction (N = 24, D/I = 31/62, k = 28.24, α95 = 6.04) differs significantly from the reversed one (N = 18, D/I = 223/-25, k = 16.38, α95 = 8.65): the primary magnetic signal is partly overlapped by component A carried by magnetite of recent viscuous remanent magnetization. Some samples do contain also coarse-grained haematite that, however, does not form any clustered magnetization. The palaeopole position calculated from the transposed reversed and normal polarity directions of component B corresponds to the Late Triassic (Norian) segment of the reference Baltica/Europe Apparent Polar Wander Path.
    Źródło:
    Geological Quarterly; 2017, 61, 4; 946--961
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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