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    Wyświetlanie 1-3 z 3
    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:
    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
    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
      Wyświetlanie 1-3 z 3

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