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    Wyświetlanie 1-6 z 6
    Tytuł:
    Microstructures of shear zones from selected domains of the Western Tatra Mountains
    Autorzy:
    Kania, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059986.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    structures
    kinematics
    shear zones
    Western Tatra Mountains
    Opis:
    The paper is focused on the meso- and microstructural characteristics of selected shearing zones in the Western Tatra Mts. The domains of crystalline rocks studied (Długi Upłaz Ridge, Rakoń Mt., Zabraty Ridge and Zabrať Pass, Wołowiec Mt., Trzydniowiański Mt., Czubik Mt. and Jarząbczy Mt.) show evidences of heterogeneous shearing with development of shear zones. Four types of shear zones were distinguished: (1) ductile shear zones in gneisses, (2) brittle-ductile complex shear zones, (3) gneisses with clear later brittle deformation; (4) leucogranites, produced by anatexis with later brittle deformation. The development of these shear zones is characterised by occurrences of various types of fault rocks: cataclasites, S-C cataclasites and mylonites. The different shearing-related rocks and structures are interpreted as an effect of protolith diversity and strain partitioning. Shape-preferred orientation is an important structural feature of all the shearing-related rocks. Kinematic analyses revealed generally a southward sense of shearing documented by structures related to brittle conditions and northwards sense of shearing recognised in ductily sheared crystalline rocks. The time relationships between different shear zone types are discussed, leading to the conclusions that the 1st type of shear zone is pure Variscan, the 2nd type is Variscan with Alpine brittle deformation, and the 3rd and 4th types are mainly Alpine brittle deformations of Variscan syntectonic anatectic leucogranites.
    Źródło:
    Geological Quarterly; 2015, 59, 4; 679--699
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aptian foraminiferal stratigraphy and Nannoconus assemblages from the Kopka section (Western Tatra Mountains, Poland)
    Autorzy:
    Pszczółkowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/191202.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Aptian
    planktonic foraminifers
    Nannoconus
    Kopka section
    Western Tatra Mountains
    Opis:
    In the Kopka section (Dolina Kościeliska valley, Western Tatra Mountains), the upper part of the Kościeliska Marl Formation consists of biomicrites with marly interbeds. These deposits, 76 m thick, are assigned to the Praehedbergella excelsa and Leupoldina cabri zones, of Aptian age. The taxa identified belong mainly to the genera Praehedbergella Gorbachik and Moullade, 1973, Globigerinelloides Cushman and Ten Dam, 1948 (emended by Longoria 1974 and Verga and Premoli Silva, 2003a) and Gorbachikella Banner and Desai, 1988. Nineteen Nannoconus taxa were identified during an SEM study of 34 samples. The occurrence of N. vocontiensis in the higher part of the section allows the nannoconid assemblages in the upper part of the section to be distinguished from those in the lower part. Four Nannoconus assemblages were recognized in these limestones: (1) Nannoconus bucheri-N. steinmannii, (2) N. truitti frequens, (3) N. vocontiensis and (4) N. aff. regularis. The wide-canal Nannoconus specimens are more frequent than the narrow-canal ones in the limestones of earliest Aptian age (Praehedbergella excelsa Zone), but the wide-canal forms predominate consistently in the upper part of the section, still within the L. cabri Zone.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2015, 85, 1; 123-138
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microfabric diversity and grain shape analysis of fault rocks from the selected areas of the Western Tatra Mountains
    Autorzy:
    Kania, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059963.pdf
    Data publikacji:
    2014
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    microfabrics
    grain shape analysis
    fault rocks
    shear zones
    Western Carpathians
    Western Tatra Mountains
    Opis:
    Fault rocks in brittle and brittle-ductile shear zones played a key role in the evolution of the Western Tatra Mountains crystal- line rocks (Poland-Slovakia). Microfabrics of these rocks, including grain shape analyses, were investigated in the six areas of the Western Tatra Mountains. Based on studies of thin sections, 14 types of fault rock microfabric are distinguished, ac- cording to the following criteria: (a) the presence and abundance levels of a cataclastic matrix and (b) the presence and form of a preferred orientation features. General tendencies observed in these areas indicate southwards increasing non-coaxial deformation as well as the domination of ultracataclasites or ultramylonites to phyllonites in areas with negative relief (e.g., sedlo Zabrat’ Pass, Dziurawa Przełęcz Pass). A model of shear zone evo l u tion embracl ng foll owl ng three stages is pro- posed: (1) deformation partitioning and block-controlled cataclastic flow, (2) matrix-controlled cataclastic flow, (3) selective leaching and deposition of silica, leading to the formation of softened and hardened deformation domains respectively. These microstructural observations were supported by statistical analyses of the grain shape indicators (compactness, isometry, ellipticity, solidity, convexity). Two trends of relationships between compactness and convexity were noted: the first, horizontal on the correlation diagrams, was interpreted as an effect of rapid cataclasis and then sericitization, the sec- ond, with a strongly negative correlation coefficient, was considered as an effect of long-term cataclastic flow. The different microfabric data and microstructural interpretations described in this paper are consistent with a new model of the tectonic history of the Western Tatra Mountains evolution, with an important role for a non-coaxial deformation during Alpine orogeny in brittle and brittle-ductile conditions.
    Źródło:
    Geological Quarterly; 2014, 58, 1; 3--18
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stratigraphic position of alkaline volcanic rocks in the autochthonous cover of the High-Tatric Unit (Western Tatra Mts., Central Western Carpathians, Slovakia)
    Autorzy:
    Madzin, J.
    Sýkora, M.
    Soták, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059966.pdf
    Data publikacji:
    2014
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Central Western Carpathians
    Western Tatra Mountains
    autochthonous cover of the High-Tatric Unit
    alkaline volcanism
    biostratigraphy
    Opis:
    Biostratigraphic investigations of carbonate strata that sandwich volcanic rocks and studies of the volcanic rocks were made along five composite lithological sections across the Upper Jurassic-Lower Cretaceous carbonate rocks of autochthonous cover of the High-Tatric Unit in the Osobitá peak area of the Western Tatra Mts. A carbonate microbreccia that consists almost exclusively of limestone clasts containing calpionellids occurs immediately below the volcanics. The youngest identified microfossil Calpionella elliptica Cadisch in the individual limestone clasts showed the age of breccia formation to be younger than late Early-early Middle Berriasian. The volcanic rocks are overlain by the Osobitá Limestone Formation, which in the lowermost horizons consists of a few metres thick crinoidal limestone containing the foraminifers Meandrospira favrei (Charollais, Brönnimann & Zaninetti), Sabaudia minuta Hofker and Montsalevia salevensis (Charollais, Brönnimann & Zaninetti) indicating a Late Valanginian-Early Hauterivian age. The biostratigraphical and sedimentological data obtained show that volcanism took place in several phases. Less intense phases of volcanism are recorded as thin tuffitic laminae within the upper parts of the Tithonian-early Mid Berriasian Sobótka Limestone Member and as fragments of volcanic rock in the carbonate breccia. The main phase(s) of volcanism took place during the Late Berriasian-?Early Valanginian.
    Źródło:
    Geological Quarterly; 2014, 58, 1; 163--180
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zróżnicowanie typów geokompleksów częściowych (morfotopów) w południowej części Doliny Kościeliskiej w Tatrach Zachodnich
    Autorzy:
    Kmiecik-Wróbel, Justyna
    Powiązania:
    https://bibliotekanauki.pl/articles/634087.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    natural environment
    partial geocomplexes (morphotops)
    Western Tatra Mountains
    Kościeliska Valley
    środowisko przyrodnicze
    geokompleksy częściowe (morfotopy)
    Tatry Zachodnie
    Dolina Kościeliska
    Opis:
    Poznanie i zrozumienie funkcjonowania zróżnicowanego systemu środowiska przyrodniczego obszarów wysokogórskich wymaga jego uporządkowania. Właściwa jest zatem analiza oparta o jedną cechę lub element środowiska. Badania na potrzeby niniejszego opracowania przeprowadzone zostały przez autorkę w południowej części Doliny Kościeliskiej w Tatrach Zachodnich. Rzeźba terenu jest jednym z najważniejszych elementów kształtujących środowisko przyrodnicze Tatr, dlatego też stanowi doskonałe „tło” dla zilustrowania zmienności pozostałych jego cech. Podstawą poniższego opracowana było wyznaczenie morfotopów (jednostek charakteryzujących się jednorodnością cech morfologicznych oraz zachodzących współcześnie procesów morfogenetycznych), na bazie których możliwe było przedstawienie zróżnicowania pozostałych cech środowiska – budowy geologicznej, klimatu, gleb i szaty roślinnej. Na podstawie przeprowadzonych prac terenowych i analiz, wyznaczone zostały 3 główne grupy morfotopów oraz opisane poszczególne ich rodzaje.
    The paper presents a way to classify the organization of the natural environment in high-mountain areas – a method of partial geocomplexes delimitation. The main concern was put on the terrain relief and morphogenetic processes being the most important factors influencing the landscape structure. In the southern part of the Kościeliska Valley in the Tatra Mts. 10 types of morphotops (partial geocomplexes with homogeneous terrain relief and recent morphogenetic processes) were identified 3 groups distinquished: morphotops of valley floors, those of slopes and those of ridge tops. For each type of morphotop basic characteristics of lithology, climate, soils, plant cover and recent morphogenetic processes were presented in the text.
    Źródło:
    Prace Geograficzne; 2012, 128; 57-64
    1644-3586
    Pojawia się w:
    Prace Geograficzne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Jurassic–Cretaceous transition in the High-Tatric succession (Giewont Unit, Western Tatra Mts, Poland): integrated stratigraphy and microfacies
    Autorzy:
    Lodowski, Damian Gerard
    Pszczółkowski, Andrzej
    Wilamowski, Andrzej
    Grabowski, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2023960.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microfossils
    rock magnetism
    carbon isotopes
    Western Carpathians
    Tatra Mountains
    mikroskamieniałości
    skała magnetyczna
    izotopy węgla
    Karpaty Zachodnie
    Tatry
    Opis:
    Herein are presented the results of detailed bio - (calcareous dinocysts, calpionellids, foraminifers, saccocomids) and chemostratigraphic (δ13C) studies combined with high-resolution microfacies, rock magnetic and gamma-ray spectrometry (GRS) investigations performed on the upper Kimmeridgian-upper Valanginian carbonates of the Giewont succession (Tatricum, Giewont and Mały Giewont sections, Western Tatra Mountains, Poland). The interval studied covers the contact between the Raptawicka Turnia Limestone (RTL) Fm. and the Wysoka Turnia Limestone (WTL) Fm. Their sedimentary sequence is composed of micrites, pseudonodular limestones, cyanoid packstones, lithoclastic packstone and encrinites. A precise correlation with the previously published Mały Giewont section is ensured by biostratigraphy, rock magnetic and GRS logs. The methodology adopted has enabled the recognition of two stratigraphic discontinuities, approximated here as corresponding to the latest Tithonian-early (late?) Berriasian and the early Valanginian. The hiatuses are evidenced by biostratigraphic data and the microfacies succession as well as by perturbations in isotopic compositions and rock magnetic logs; they are thought to result from a conjunction of tectonic activity and eustatic changes. A modified lithostratigraphic scheme for the Giewont and the Osobita High-Tatric successions is proposed. The top of the RTL Fm. falls in the upper Tithonian, where cyanoid packstones disappear. At the base of the WTL Fm. a new Giewont Member is defined as consisting of a basal lithoclastic packstone and following encrinites.
    Źródło:
    Acta Geologica Polonica; 2022, 72, 1; 107--135
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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