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The philipsbornite–segnitite solid-solution series from Rędziny, eastern metamorphic cover of the Karkonosze granite (SW Poland)

Gołębiowska B., Włodek A., Pieczka A., Borkiewicz O., Polak M.

Annales Societatis Geologorum Poloniae

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2016

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Vol. 86, No. 1

73--83

EN

Supergene minerals of the philipsbornite–segnitite series, PbAl3(AsO4)(AsO3OH)(OH)6–PbFe3+3(AsO4) (AsO3OH)(OH)6, accompanied by carminite, PbFe3+2(AsO4)2(OH)2, were found in relics of hydrothermal quartz– chlorite–arsenopyrite veins, associated with subordinate polymetallic ores disseminated in contact zones of a dolomitic marble deposit at Rędziny, Western Sudetes, Poland, and recognized by means of electron microprobe and X-ray and electron-back-scattered diffraction (XRD and EBSD). Philipsbornite and segnitite, as the two minerals of the series, exhibit highly variable compositions, especially in terms of the range of Fe3+ Al3+ substitution at the G site, with a distinct gap between the values of 0.52 and 0.89 for the Fe/(Al+Fe) ratio; substitutions at the D and T sites are less important. In this respect, the minerals are almost identical with philipsbornite and segnitite, known from other localities. The gap might be a consequence of the limited miscibility of the end-members, but also might be attributed to crystallization under the changing and distinctly differing activities of Al3+ and Fe3+. The unit-cell parameters of philipsbornite, a = 7.1245(13) Ο, c = 17.0967(45) Ο, make the mineral comparable with philipsbornites from other occurrences. The EBSD analysis confirmed the rhombohedral structure of both minerals and the space group symmetry R-3m. The minerals crystallized in the sequence: philipsbornite -> segnitite -> carminite, which reflects (i) decreasing acidity in the oxidation zone, due to the leaching of sulphate ions and interaction of the solutions with a nearby dolomite lens, and (ii) varying activities of Al3+, Fe3+ and Pb2+ cations, mobilized by the solutions through interaction with the silicate host containing disseminated arsenopyrite and subordinate sulphides, up to complete Pb2+ depletion.

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Sulphate and arsenate minerals as environmental indicators in the weathering zones of selected ore deposits, Western Sudetes, Poland

Parafiniuk J., Siuda R., Borkowski A.

Acta Geologica Polonica

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2016

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Vol. 66, no. 3

493--508

EN

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.

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Nowe dane o minerałach wietrzeniowych złoża Miedzianka-Ciechanowice w Rudawach Janowickich (Dolny Śląsk, Polska)

Siuda R., Gołębiowska B.

Przegląd Geologiczny

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2011

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Vol. 59, nr 3

226-226

EN

The abandoned deposit of polymetallic ore in Miedzianka-Ciechanowice is located in the northern part of the Kowary-Czarnów Unit, within the eastern metamorphic cover of the Karkonosze granite. This deposit is formed mainly of hydrothermal veins related to the Karkonosze granite and Intra-Sudetic Fault. Lenses-forming contact-metasomatic ores are also present. The ore assemblages are rich in Cu, and poor in Pb, Ag, As and Fe. The Miedzianka- -Ciechanowice deposits were mined from the early Middle Ages to the middle of the 20th

4

Zastosowanie polimerów chelatujących do usuwania z wód związków arsenu

Ociński D., Kociołek-Balawejder E.

Polimery

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2011

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T. 56, nr 1

11-19

PL

Artykuł stanowi przegląd literaturowy dotyczący możliwości wykorzystania polimerów chelatujących zawierających różne grupy funkcyjne, w procesach usuwania z wód związków arsenu(III) i (V), które wykazują dużą toksyczność i są poważnym zagrożeniem ekologicznym w wielu rejonach świata. Przedstawiono mechanizmy wiązania arsenianów i arseninów bezpośrednio przez grupy funkcyjne polimerów, jak również na drodze tzw. wymiany ligandowej. Omówiono wpływ warunków prowadzenia procesu, tj. natężenia przepływu roztworu przez złoże, pH oczyszczanej wody oraz obecności innych jonów na efektywność wiązania związków arsenu. Opisano możliwości regeneracji i wielokrotnego wykorzystania polimerów chelatujących.

EN

A review of the literature on the possibilities of the application of chelating polymers containing various functional groups (Table 1) for the removal of highly toxic and environmentally hazardous arsenic(III) and (V) compounds from water in different parts of the world has been presented. The mechanisms of direct coupling of arsenates and arsenites by the functional groups of the polymers, and also of the so-called ligand exchanging has been discussed (Figs. 1, 2). The influence of factors such as solution flow rate through the polymer bed, water pH value and the presence of other ions on the efficiency of coupling the arsenic compound was evaluated. The possibility of regeneration and multiple use of the chelating polymers was discussed.