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    Wyświetlanie 1-5 z 5
    Tytuł:
    Magma mingling textures in granitic rocks of the eastern part of the Strzegom-Sobótka Massif (Polish Sudetes)
    Autorzy:
    Domańska-Siuda, Justyna
    Bagiński, Bogusław
    Powiązania:
    https://bibliotekanauki.pl/articles/138640.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Strzegom-Sobótka Massif
    granite
    enclave
    Variscides
    magma mixing
    magma mingling
    textures
    monazite (Ce) crystals
    masyw Strzegom-Sobótka
    granit
    enklawa
    waryscydy
    miksacja magmy
    mieszanie magmy
    tekstury
    monacyt
    Opis:
    Many granitic intrusions display evidence of magma mixing processes. The interaction of melts of contrasting composition may play a significant role during their generation and evolution. The Strzegom-Sobótka massif (SSM), located in the Sudetes (SW Poland) in the north-eastern part of the Bohemian Massif of the Central European Variscides, exhibits significant evidence of magma mingling on the macro- and micro-scales. The massif is a composite intrusion, with four main varieties: hornblende-biotite granite (with negligible amount of hornblende) and biotite granite in the western part, and two-mica granite and biotite granodiorite in the eastern part. Field evidence for magma mingling is easily found in the biotite granodiorite, where dark enclaves with tonalitic composition occur. Enclaves range from a few centimeters to half a meter in size, and from ellipsoidal to rounded in shape. They occur individually and in homogeneous swarms. The mixing textures in the enclaves include fine-grained texture, acicular apatite, rounded plagioclase xenocrysts, ocellar quartz and blade-shaped biotite. The most interesting feature of the enclaves is the presence of numerous monazite-(Ce) crystals, including unusually large crystals (up to 500 μm) which have grown close to the boundaries between granodiorite and enclaves. The crystallization of numerous monazite grains may therefore be another, previously undescribed, form of textural evidence for interaction between two contrasting magmas. The textures and microtextures may indicate that the enclaves represent globules of hybrid magma formed by mingling with a more felsic host melt. Chemical dating of the monazite yielded an age of 297±11 Ma.
    Źródło:
    Acta Geologica Polonica; 2019, 69, 1; 143-160
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    U-Pb zircon geochronology of high-grade charnockites - exploration of pre-Mesoproterozoic crust in the Mazury Complex area
    Autorzy:
    Krzemińska, Ewa
    Łukawska, Aleksandra
    Bagiński, Bogusław
    Powiązania:
    https://bibliotekanauki.pl/articles/139214.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magmatic protolith
    U-Pb geochronology
    dry metamorphism
    continental margin
    protolit magmowy
    geochronologia U-Pb
    metamorfizm suchy
    margines kontynentalny
    Opis:
    Charnockites – i.e., orthopyroxene-bearing felsic rocks – were formed in a deep-seated dry environment, either under plutonic or high-grade metamorphic conditions. Most charnockites known from the crystalline basement of Poland appear to be of Mesoproterozoic age (1.50–1.54 Ga), cogenetic with the Suwałki Anorthosite Massif, and associated with mangerite and granite members forming the AMCG suite of the Mazury Complex. Genetically distinct rocks, characterised by the presence of anhydrous minerals, e.g., orthopyroxene and garnet, were also recognised along 592 m of the Łanowicze PIG-1 borehole section, within the AMCG suite. U-Pb geochronology by sensitive high resolution ion microprobe (SHRIMP) was used to date the complexly zoned zircons. The ages of crystallisation of the charnockite protoliths from various depths at 1837 ± 7, 1850 ± 9, 1842 ± 6, and 1881 ± 16 Ma makes these rocks the oldest dated crust within this part of the Polish basement. The Łanowicze PIG-1 borehole section bears components from neighbouring tectonic domains known from Lithuania: the West and Middle Lithuanian (WL/MLD) domains considered as a continental margin at 1.84–1.86 Ga and the fragmented Latvia-East Lithuania (LEL) domain, where the oldest continental crust was generated at c. 1.89–1.87 Ga. The metamorphic zircon overgrowths document a high-grade event at 1.79 Ga and then constrained at 1.5 Ga. Dating of pre-Mesoproterozoic crust cryptic within the AMCG Mazury Complex provides valuable information on the nature of the pre-existing blocks formed during the long lasting Svecofennian orogeny.
    Źródło:
    Acta Geologica Polonica; 2019, 69, 4; 489-511
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ba-Fe titanates in Peralkaline granite of the Ilímaussaq Complex, South Greenland
    Autorzy:
    Cegiełka, Małgorzata
    Bagiński, Bogusław
    Macdonald, Ray
    Marciniak-Maliszewska, Beata
    Stachowicz, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/2023983.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ilímaussaq peralkaline granite
    henrymeyerite
    low-Fe Ba Titanate
    granit
    minerały
    kryształy
    tytanian baru
    Opis:
    A peralkaline granite of the Ilímaussaq Complex, South Greenland, contains the rare mineral henrymeyerite [(Ba0.92Na 0.05Ca0.03) 1.0(Ti6.87Fe2+1.04Nb 0.03)7.9O 16], a low-Fe Ba titanate [(Ba0.74 Ca0.02Na 0.05) 0.8 (Ti4.9o Fe2+0.15Nb 0.04)5.1O 11], and an unidentified Ba titanosilicate. Both titanates show the coupled substitution 2Na+ + Si4+→ Ba2+ + Ti4+. The minerals are present as tiny crystals fringing ilmenite inclusions in an amphibole crystal and are thought to have formed during the hydrothermal stage of the granite’s evolution.
    Źródło:
    Acta Geologica Polonica; 2022, 72, 1; 1--8
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chevkinite-group minerals in Poland
    Autorzy:
    Nejbert, Krzysztof
    Bagiński, Bogusław
    Kotowski, Jakub
    Jokubauskas, Petras
    Jurewicz, Edyta
    Macdonald, Ray
    Powiązania:
    https://bibliotekanauki.pl/articles/138930.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Chevkinite group minerals
    Chevkinite-(Ce)
    Perrierite-(Ce)
    mineral chemistry
    petrological significance
    Polska
    minerały
    chemia minerałów
    znaczenie petrologiczne
    Polska
    Opis:
    The chevkinite group of minerals are REE,Ti-silicates increasingly recognized as widespread accessory phases in a wide range of igneous and metamorphic parageneses. Members of the group are here recorded from five localities in Poland: a two-pyroxene andesite from the Kłodzko-Złoty Stok intrusion, a trachyandesite intrusion north of the Pieniny Mountains, a rapakivi-type granite from the Krasnopol intrusion, an anorthosite from the Suwałki Anorthosite Massif, and nepheline syenite from the Ełk syenite massif. Specific members found are chevkinite-(Ce), perrierite-(Ce) and, potentially, the Al-dominant analogue of perrierite-(Ce). The case is made that chevkinite-group minerals will, through systematic investigation, be found in a wide range of Polish igneous and metamorphic rocks.
    Źródło:
    Acta Geologica Polonica; 2020, 70, 1; 97-106
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zirconium silicates in a peralkaline granite: a record of the interplay of magmatic and hydrothermal processes (Ilímaussaq complex, Greenland)
    Autorzy:
    Cegiełka, Małgorzata
    Bagiński, Bogusław
    Macdonald, Ray
    Belkin, Harvey E.
    Kotowski, Jakub
    Upton, Brian G. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2086665.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    peralkaline granite
    Ilímaussaq complex
    zircon
    catapleiite
    Elpidite
    hydrothermal fluids
    granit peralkaliczny
    kompleks Ilimaussaq
    cyrkon
    płyny hydrotermalne
    Opis:
    Compositional and textural data are presented for zircon, secondary Zr-silicates, catapleiite and elpidite in a peralkaline granite from the Ilímaussaq complex, south Greenland. The zircon is essentially stoichiometric, with (Zr + Hf + Si) = 1.96–1.98 a.p.f.u. The secondary Zr-silicates show a wide range of Zr/Si atomic ratios (0.13–0.79). The catapleiite varies from close to stoichiometric to a Na-depleted type showing cation deficiency (5.2–5.8 a.p.f.u.). Elpidite shows similar variations (7.2–9.0 a.p.f.u.). Textural relationships between the Zr phases are interpreted to show that magmatic zircon interacted with hydrous fluids exsolved from the magma to form the secondary Zr-silicates. Formation of catapleiite was late-magmatic, in equilibrium with a Na-Si-bearing fluid. This was followed by the crystallization of elpidite, the fluid having a different Na/Si ratio. Both catapleiite and elpidite experienced Na-loss during late-stage hydrothermal alteration.
    Źródło:
    Acta Geologica Polonica; 2022, 72, 2; 235--245
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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