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    Wyświetlanie 1-2 z 2
    Tytuł:
    Sulphate and arsenate minerals as environmental indicators in the weathering zones of selected ore deposits, Western Sudetes, Poland
    Autorzy:
    Parafiniuk, J.
    Siuda, R.
    Borkowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/139438.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sulphates
    arsenates
    Slavikite
    zýkaite
    kaňkite
    pitticite
    fosforany
    arseniany
    zýkait
    kaňkit
    pitticit
    Opis:
    The results of a complex investigation of the sulphate and arsenate assemblages forming in the weathering zone of selected ore deposits in the Sudetes are presented. The development of the weathering zone has been characterised in the polymetallic ore deposits at Miedzianka–Ciechanowice and Radzimowice, and the pyrite deposit at Wieściszowice, which differ in the chemical compositions of the ore and barren minerals and the hydrological conditions. Secondary sulphate and arsenate mineral assemblages vary significantly among the ore deposits under study. Their crystallization is discussed, taking into consideration the stability of particular minerals and the paths of their transformation. It is shown that these minerals have great potential as indicators of weathering processes. A significant role for microorganisms in the formation of the weathering zone of the ore deposits under study is also proven.
    Źródło:
    Acta Geologica Polonica; 2016, 66, 3; 493-508
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Paragenezy hipergeniczne złoża Radzimowice (Góry Kaczawskie)
    Supergene parageneses of the Radzimowice deposit (Kaczawa Mts., Poland)
    Autorzy:
    Siuda, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074958.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Radzimowice
    deposit
    secondary minerals
    zýkaite
    kaňkite
    pitticite
    złoża
    minerały wtórne
    zýkait
    kaňkit
    pitticit
    Opis:
    The polymetallic Radzimowice deposit is located in the vicinity ofRadzimowice village, about 20 km east of Jelenia Góra (Western Sudetes, Poland). The deposit consists of several ore veins. The primary ore assemblage is represented by arsenopyrite, pyrite and chalcopyrite, and less common galena, sphalerite, Cu-Pb-Sb sulphosalts of Cu andPb, and native gold. The mining activity in this area started in the mid-12th century and lasted until the mid-20th century. This paper presents general information about typical parageneses of secondary minerals occurring in the oxidation zone of the Radzimowice deposit. Based on the mineralogical investigations, 43 secondary mineral species have been recognized. Such a rich assemblage of secondary minerals makes the oxidation zone one of the most interesting formations of this kind in Poland. Phosphates (pseudomalachite, phosphosiderite) and sulphides (covellite, chalcocite) of copper were ascertained in the near-surface part of the supergene zone. Secondary lead minerals (cerussite, pyromorphite and mimetite) were found only in medieval dumps. Phosphates and sulphides of Cu and supergene lead minerals belong to sub-recent secondary parageneses. Since the end of local mining activity in 1957, the intensive weathering processes caused the decomposition of ore minerals in the mine galleries, producing recently forming associations of new minerals. The first mineral paragenesis is represented by recently formed arsenates. Kankite, scorodite and zykaite are the most widespread constituents of this assemblage. Large accumulations ofpitticite, forming stalagmites up to 10 cm in length, are sometimes found in old mine galleries. In those parts of the abandoned mine, where pyrite is a dominant primary mineral, huge accumulations of the minerals related to acid mine drainage are present. Schwertmannite, ferrihydrite and poorly crystalline goethite are the main representatives of this paragenesis. Associations of basic copper sulphates are present in all parts of the abandoned mine. Langite, posnjakite, brochantite and devilline are the most common minerals of this assemblage. Sulphates of Cu and Al (chalcoalumite and cyanotrichite), native copper, cuprite and malachite are locally found to coexist with these phases. Precipitations of secondary minerals play an important role in the retention and liberation of considerable amounts of toxic elements. Dissolution ofthese phases can result in the release ofarsenic and heavy metals into the groundwater and in the migration ofthese elements into the environment.
    Źródło:
    Przegląd Geologiczny; 2012, 60, 8; 442--449
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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