scholarly journals On Iron Sulphides in Calcareous Nodule

1958 ◽  
Vol 3 (6) ◽  
pp. 597-602_1
Author(s):  
Masao Isibasi
Keyword(s):  
Iron Sulphides ◽  
Calcareous Nodule

Reactions of iron sulphides in simulated stack gases

1972 ◽  
Vol 22 (5) ◽  
pp. 613-622 ◽  
Author(s):  
C. Karr ◽  
R. V. Rahfuse ◽  
P. F. Langdon
Keyword(s):  
Iron Sulphides

Pyrite geochemistry and fossil preservation in shales

1985 ◽  
Vol 311 (1148) ◽  
pp. 167-169 ◽  
Keyword(s):  
Organic Matter ◽  
Water Column ◽  
Sulphate Reduction ◽  
Pore Waters ◽  
Anoxic Waters ◽  
Iron Sulphides ◽  
Diagenetic Reaction ◽  
Fossil Preservation

As emphasized by Dr Seilacher in his introduction to this symposium, and illustrated in the contribution by Mr Martill, some of the most important examples of fossil Lagersätten occur in marine shales of Mesozoic age. Many of the factors that control the types and preservation of fossils are the same as those that affect the authigenic mineralogy and geochemistry of the shales, notably the degree of aeration or stagnation of the water column and the quantity and quality of the organic matter supplied to the sediment. Perhaps the most important diagenetic reaction in marine shales is sulphate reduction by bacteria that are obligate anaerobes. They can operate in anoxic waters or in ‘reducing microenvironments’ (such as concentrations of organic matter, or enclosed voids within shells) in sediments whose pore waters are kept generally oxic by the effects of burrowing organisms. Sulphate is reduced to sulphide and in the presence of reduced iron this can be precipitated as iron sulphides, normally found in ancient sediments in the form of pyrite. Pyrite is thus a key mineral in studying shale diagenesis, for its geochemistry as well as for its direct importance in preserving fossils by replacement of soft-parts (see, for example, Stürmer 1984), of aragonitic shells (see, for example, Fisher 1985) and by forming internal moulds of chambered shells (see, for example, Hudson & Palframan 1969; Hudson 1982).

Chemical composition of iron sulphides contained in dust from pyrometallurgical Zn and Pb production

2021 ◽  
pp. geochem2020-073
Author(s):  
Katarzyna Nowińska ◽  
Zdzisław Adamczyk
Keyword(s):  
Phase Composition ◽  
Chemical Composition ◽  
Production Process ◽  
Zinc Sulphide ◽  
Iron Sulphide ◽  
Lead Sulphide ◽  
Iron Sulphides ◽  
Mineral Components

The paper presents results of investigations of the chemical composition of iron sulphides contained in dust from the pyrometallurgical production process of zinc and lead. The main mineral components of these dusts are sphalerite, galena, iron sulphide – pyrite, zincite, anglesite and probably kirchsteinite. The tests performed have demonstrated that the chemical composition of iron sulphide grains was not close to stoichiometric, the grains were non-uniform in terms of phase composition, and they always included admixtures in the form of inclusions of other sulphides, i.e. zinc sulphide and lead sulphide, and accompanying elements (Ca, Mn, Se, As, Ag, Cu, Cd).

Iron sulphides in magnetic belts near the Cuyuna range

1924 ◽  
Vol 19 (5) ◽  
pp. 466-472
Author(s):  
George A. Thiel
Keyword(s):  
Iron Sulphides

Characterization of iron sulphides from ore mining rejects

2002 ◽  
pp. 447-451
Author(s):  
Wagner N. Mussel ◽  
José D. Fabris ◽  
Viviane G. Costa ◽  
Walter A. P. Abrahão ◽  
Jaime W. V. Mello
Keyword(s):  
Iron Sulphides

scholarly journals Properties of iron sulphides from a copper mine in southern Brazil

2010 ◽  
Vol 217 ◽  
pp. 012054
Author(s):  
Wagner N Mussel ◽  
Enver Murad ◽  
Natalie C Magalhães ◽  
Walter A P Abrahão ◽  
Jaime W V Mello ◽  
...  
Keyword(s):  
Southern Brazil ◽  
Copper Mine ◽  
Iron Sulphides

Pyrite-pyrrhotine redox reactions in nature

1986 ◽  
Vol 50 (356) ◽  
pp. 223-229 ◽  
Author(s):  
A. J. Hall
Keyword(s):  
Redox Reactions ◽  
Sedimentary Rocks ◽  
Depositional Environments ◽  
Hydrothermal Solutions ◽  
Geochemical Processes ◽  
Iron Sulphide ◽  
Progressive Reduction ◽  
Rock Types ◽  
Iron Sulphides ◽  
The Common

AbstractThe origin in rocks of the common iron sulphides, pyrrhotine, Fe1-xS and pyrite, FeS2and their behaviour during geochemical processes is best considered using the simplified redox reaction: 2FeS ⇌ FeS2+ Fe2++ 2e−.Thus pyrrhotine is more reduced than pyrite and is the stable iron sulphide formed from magmas except where relatively high oxygen fugacities result from falling pressure or hydrothermal alteration. Pyrite, on the other hand, is the stable iron sulphide in even the most reduced sedimentary rocks where it usually forms during diagenesis through bacteriogenic reduction of sulphate; it is stable throughout the pressure/temperature range endured by normal sedimentary rocks. Pyrrhotine after pyrite or sulphate in metasediments of regional metamorphic origin results mainly from progressive reduction on metamorphism due to the presence of graphite-buffered fluids. Pyrrhotine and/or pyrite may be precipitated from hydrothermal solutions on epigenetic or syngenetic mineralization but pyrrhotine will only be preserved if protected from oxidation to pyrite or to more oxidized species. Exhalative pyrrhotine appears to have been more common in Precambrian times and/or in depositional environments destined to become regionally metamorphosed. FeS can be considered to be the soluble iron sulphide, rather than FeS2, in reduced aqueous systems although pyrite may precipitate from solution as a result of redox reactions. The relatively soluble nature of FeS explains the observed mobility of iron sulphides in all rock types.

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