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Wyszukujesz frazę "granitoidy" wg kryterium: Temat


Wyświetlanie 1-2 z 2
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:
Fluorite and related fluids in the Karkonosze granitoid pluton, SW Poland
Autorzy:
Kozłowski, Andrzej
Matyszczak, Witold
Powiązania:
https://bibliotekanauki.pl/articles/2023996.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Karkonosze pluton
Variscan granitoids
pegmatite
fluorite
fluid inclusions
inclusion alterations
post-magmatic fluids
pluton Karkonoszy
waryscyjskie granitoidy
pegmatyt
fluoryt
inkluzje fluidalne
Opis:
Fluorite mineralization was studied in the Variscan granitoid Karkonosze pluton in the northern part of the Bohemian massif (Lower Silesia, Poland). Fluid inclusions in fluorite and quartz were investigated by the following methods: heating and freezing on an immersion microscope stage, spectrophotometric and electron probe analysis, calcination and water leachate. The parent fluids of fluorite were of the Na-Ca-Cl type with a low CO₂ content. The fluoride ions had sources in the pluton and in its host rocks. Fluid inclusion observations provide evidence of various post-formation alteration. such as refilling, partition, cracking, migration, expulsion or vacuole modification from irregular to cubic habit. A final model of fluorite origin and parent fluid evolution is presented.
Źródło:
Acta Geologica Polonica; 2022, 72, 1; 9--31
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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