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    Wyświetlanie 1-6 z 6
    Tytuł:
    Granity typu A w kompleksie mazurskim - przyczynek do dyskusji o klasyfikacji granitów
    A-type granites in the Mazury Complex - contribution to world-wide discussion on granite classification
    Autorzy:
    Gawęda, A.
    Krzemińska, E.
    Wiszniewska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074712.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    skały granitoidowe
    klasyfikacja
    granitoidy kompleksu mazurskiego
    granitoid rocks
    classification
    granitoid Mazury Complex
    Opis:
    The modern geochemical classification of granitic rocks is based upon diverse criteria such as: mineralogy, geochemistry, tectonic environment and their origin. The alphabetic classification of S, I, M and A-type granites have been used to facilitate recognition of the origin, chemical composition and geotectonic setting. Of these, the A-type term has generated worldwide discussions in petrological communities. The authors discuss the geochemical, mineralogical and geotectonic features as well as the question of source rocks and co-genetic rock complexes of A-type granites at the example of the Mazury granitoid complex. The Mesoproterozoic Mazury Complex from the crystalline basement of East European Craton represents A-type group of granitoids, plotting in WPG (Within Plate Granites) and A2 type fields. The obtained results confirm usability and at the same time practical diagnostic value of the term of A-type for defining a special type of granites, distinguishable from the other ones.
    Źródło:
    Przegląd Geologiczny; 2009, 57, 6; 478-485
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silver compounds as minerals in the eastern Karkonosze granitoid pluton, Sudetes, Poland
    Autorzy:
    Kozłowski, Andrzej
    Matyszczak, Witold
    Powiązania:
    https://bibliotekanauki.pl/articles/24024698.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    silver
    sulphide
    arsenide
    selenide
    tellurides
    chloride
    fluid inclusions
    Karkonosze granitoid
    srebro
    siarczki
    arsenek
    selenki
    tellurki
    chlorki
    inkluzje fluidalne
    Granitoid Karkonosze
    Opis:
    Twenty silver minerals of the sulphide, arsenide, selenide, telluride, sulphosalt and chloride groups were found in 13 locations in the Variscan Karkonosze granitoid pluton. Previously only one of these minerals was known from this area. The findings include species characterized in publications as rare or exceptionally rare, e.g., muthmannite and tsnigriite. They occur in pegmatites and quartz veins; their parageneses are described. The studies include determination of chemical compositions, formulae calculations and recording of XRD patterns. Inclusion studies in paragenetic quartz indicate that they crystallized from epithermal fluids with a common but low component of CO2. The results suggest that the minerals formed from trace elements (Ag included) in the Karkonosze granitoid due to very local degrees of recrystallization of the host granitoid.
    Źródło:
    Acta Geologica Polonica; 2022, 72, 4; 443--468
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variscan granitoid plutonism in the Strzelin Massif (SW Poland) : petrology and age of the composite Strzelin granite intrusion
    Autorzy:
    Oberc-Dziedzic, T.
    Kryza, R.
    Pin, C.
    Madej, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059728.pdf
    Data publikacji:
    2013
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    zircon SHRIMP geochronology
    composite granitoid plutons
    Variscan granitoids
    Strzelin Massif
    Opis:
    Petrological data and recently published U/Pb zircon SHRIMP ages reveal a protracted Variscan magmatic evolution in the Strzelin Massif (SW Poland), with three main stages of granitoid plutonism: 1 – tonalitic I, 2 – granodioritic and 3 – tonalitic II/granitic. The granitoids of the second and third stages form the Strzelin intrusion that is composed of three varieties: medium-grained biotite granite, fine-grained biotite granite and fine-grained biotite-muscovite granite. New SHRIMP data show that the medium-grained and fine-grained biotite granites comprise different zircon populations that reflect complex and prolonged plutonic processes. Two distinct magmatic events seem to be represented by well-defined zircon populations with apparent 206Pb/238U ages of 303 ± 2 Ma in the medium-grained biotite granite, and 283 ± 8 Ma in the fine-grained biotite granite. These dates, however, do not necessarily reflect the true magmatic ages, possibly being “rejuvenated” by radiogenic lead loss in zircons (impossible to resolve based on routine SHRIMP data). Based on field evidence, the third variety, the biotite-muscovite granite, postdates both types of biotite granites. The petrographic and geochemical features, including Nd isotope signature, along with various zircon inheritance patterns and ages, suggest that the parental magmas of the three granites originated from different crustal sources and were emplaced during three successive magmatic pulses.
    Źródło:
    Geological Quarterly; 2013, 57, 2; 269--288
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Native silver in the eastern part of the Karkonosze granitoid pluton, Lower Silesia, Poland
    Autorzy:
    Kozłowski, Andrzej
    Matyszczak, Witold
    Powiązania:
    https://bibliotekanauki.pl/articles/27323964.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    native silver
    fluid inclusions
    granitoid
    Karkonosze pluton
    srebro rodzime
    inkluzja fluidalna
    granitoidy
    pluton Karkonoszy
    Opis:
    This article describes silver specimens of the size of tenths to a few millimetres, found in small pegmatites and quartz veinlets of the porphyritic granitoid area in 22 sites in the eastern part of the Variscan granitoid Karkonosze pluton, from 20 of which native silver occurrences were previously not known. The sites are scattered on the whole surface of the granitoid. The native silver occurred in wire, rod, platy, dendritic, anhedral granular and euhedral cubic and octahedral habits; in some specimens twins and fenster faces were also found. Associated with native silver small amounts of acanthite crystallized commonly, sometimes apparently formed by sulphur diffusion into silver. Inclusions of native gold, electrum, galena, chalcopyrite and pyrite occurred in the native silver. The parent fluids of the specimens were epithermal, because the homogenization temperature (Th) of inclusions in quartz, calcite and cleavelandite that were the host minerals of the native silver was generally 91–165ºC and for individual samples the Th range was 4–11ºC. The total salinity of the fluid was 2.4–7.2 wt. % with Na and Ca (hydro)carbonates as the main dissolved components and admixtures of K, Mg, Fe, Al, S, Cl and F. The parent granitoid contains Ag in trace amounts (0.034–0.056 ppm) and was probably the source of this element for the crystals of native silver. Migration of Ag was made easier by the presence of fluoride ions in fluids.
    Źródło:
    Acta Geologica Polonica; 2023, 73, 2; 223--245
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    W poszukiwaniu fragmentów najstarszej skorupy kontynentalnej na Labradorze
    Searching for pieces of the oldest crust in Labrador
    Autorzy:
    Kusiak, M. A.
    Sałacińska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075545.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    młoda Ziemia
    blok Saglek
    Labrador
    granitoid
    cyrkon
    early Earth
    Saglek Block
    granitoids
    zircon
    Opis:
    There are few unresolved questions in the Earth Sciences which generate as much debate as the nature of the Hadean Earth: i.e. the rock record between the Earth’s formation and about 3.8 billion years ago. Current knowledge of the nature and origin of the earliest crust comes largely from studies of the mineral zircon (ZrSiO4). The oldest zircon grains on Earth (4.46 Ga) are found in Jack Hills, Australia. They represent a time capsule of what the Earth was like from ca. 4.4-4.0 Ga during the Hadean. The other ancien rocks (>3.8 Ga) are preserved in Antarctica, Canada, China, Greenland, Labrador, Western Australia and Swaziland, with the oldest known rochi on Earth from the Acasta gneiss in Northern Canada, dated at 4.03 Ga. Most likely, the second oldest rock record in the world (>3.9 Ga) may be derivedfrom the Nanok gneiss in the Nain Complex of the Saglek-Hebron area in the northern part of the Labrador Peninsula. Extensive investigation of these rocks will allowfurther characterizing the nature of the earliest preserved crust.
    Źródło:
    Przegląd Geologiczny; 2016, 64, 11; 896--901
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oxygenic bismuth minerals in the NE part of the Karkonosze pluton (West Sudetes, SW Poland)
    Autorzy:
    Kozłowski, A.
    Matyszczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/139403.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Karkonosze granitoid pluton
    bismuth minerals
    secondary minerals
    oxidation
    vein
    pegmatite
    Karkonosze
    pluton
    minerały bizmutu
    minerały wtórne
    utlenianie
    żyła
    pegmatyt
    Opis:
    The study presents fifteen oxygen-bearing secondary minerals of bismuth from the north-eastern part of the Variscan Karkonosze granitoid pluton in the northern zone of the Bohemian massif. The minerals were investigated by optical, electron microprobe, classic chemical, XRD, IR absorption and fluid inclusion methods. The late, very low temperature epithermal solutions most probably caused formation of sillénite, kusachiite, bismoclite, bismutite, beyerite, kettnerite, pucherite, schumacherite, namibite and eulytite. Solutions dominated by supergene (meteoric) waters were the parents for bismite, russellite, koechlinite, ximengite and walpurgite. The paper also contains information on early research on the investigated minerals.
    Źródło:
    Acta Geologica Polonica; 2018, 68, 4; 537-554
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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