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Conditions of formation of the iron-containing minerals, Hällefors silver mines, Bergslagen, Sweden
Published online by Cambridge University Press: 05 July 2018
Abstract
The Hällefors silver deposit is regarded as a volcanogenic-exhalative iron ore deposit with dispersed amounts of Ag-Pb-Zn (±Cu) which has undergone secondary remobilization leading to the concentration of sulphides and sulphosalts. Based on data from the iron oxides and sulphides, the sulphide-sulphosalt mineralization is believed to have been formed in two stages. The first is characterized by the ranges 573-473 K and 2.25–1.5 kbar, higher gradient of changes of log aS2 with temperature and mostly sulphide precipitation; the second by the ranges 473–443 K, lower gradient of changes of log aS2 and mainly sulphosalt deposition. Assuming the precipitation was from fluids and aqueous solutions, possible conditions of formation of some of the iron minerals have been determined.
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- Mineralogy
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- Copyright
- Copyright © The Mineralogical Society of Great Britain and Ireland 1986
Footnotes
Present address: Technical University of Wrocław, Institute of Inorganic Chemistry and Metallurgy of Rare Elements, 50-370 Wrocław, Wybrzeże Wyspiańskiego 27, Poland.