Journal ArticleDOI
The formation of pyrite from hydrated iron oxide in aqueous solution at 20°C
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In this article, a pyrite was synthesized at room temperature and atmospheric pressure from hydrated iron oxides and hydrogen sulphide under conditions similar to those expected in the natural environment.Abstract:
Experiments are described in which pyrite is synthesized at room temperature and atmospheric pressure from hydrated iron oxides and hydrogen sulphide under conditions similar to those expected in the natural environment. This synthesis differs from earlier work in that oxygen was rigorously excluded from the system and the pH was 5.6. During a later ageing period a reaction appears to take place in which iron monosulphide is converted to pyrite at pH 5.85.read more
Citations
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Journal ArticleDOI
Fractionation of sulfur isotopes during laboratory synthesis of pyrite at low temperatures
Fred T. Price,Yuch-Ning Shieh +1 more
TL;DR: The reaction products and the accompanying sulfur isotope fractionations during the reaction of H 2 S with goethite in aqueous media at 22-24°C for periods from 0.5 hr to 65 days were studied as mentioned in this paper.
Book ChapterDOI
Present Day Formation of an Exhalative Sulfide Deposit at Vulcano (Thyrrhenian Sea), Part II: Active Crystallization of Fumarolic Sulfides in the Volcanic Sediments of the Baia di Levante
TL;DR: In this article, the textures of the mineralized rocks have been examined by reflection microscopy, and chemical analyses for the major, minor and trace elements in the total mineralised rocks show an enrichment of Fe, Si, S, B and Ba, whereas the original silicate minerals (augite, plagioclase and glass) were opalized.
Journal ArticleDOI
Sulphur speciation and pyrite formation in meromictic ex-fjords
TL;DR: Powell and Sakinaw lakes are stably stratified ex-fjords, which became isolated from the Strait of Georgia approximately 11000 years ago by emerged sills due to postglacial isostatic rebound as mentioned in this paper.
Journal ArticleDOI
Exhalative supergenic uranium, thorium and marcasite occurrences in quaternary volcanites of central Italy
E. Locardi,M. Mittempergher +1 more
TL;DR: In the Quaternary alkali-potassic volcanites of Northern Latium, there are classical solfataras related to volcanic structures, and very large kaolinized fields, at the borders of the volcanic systems (perivolcanic), related to pre-volcanic tectonic structures as discussed by the authors.
Book ChapterDOI
The Sulphides of Certain Deep-Sea Sediment Samples Collected on DSDP Leg 31
TL;DR: In this article, the manner of occurrence of sulphides (pyrite and pyrite melnikovite?) in a number of samples from the Philippine Sea is described and their genesis briefly discussed.
References
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Journal ArticleDOI
The distribution and isotopic abundance of sulphur in recent marine sediments off southern California
TL;DR: Analyses of sulphur compounds in basin sediments off southern California indicate that elemental sulphur, free sulphide, hydrotroilite, organic sulphur and pyrite are present in quantities that vary with environment and depth in the sediments as mentioned in this paper.
Journal ArticleDOI
Iron Sulfides Formed from Aqueous Solution at Low Temperatures and Atmospheric Pressure
TL;DR: Several different iron sulfides have been synthesized from aqueous sulfide solutions at low temperatures (200-90° C.) and atmospheric pressure and identified by means of X-ray diffraction and/or chemical analysis as mentioned in this paper.
Journal ArticleDOI
Stability Fields of Iron Minerals in Anaerobic Marine Sediments
TL;DR: In this paper, the stability fields of authigenic iron minerals for anaerobic marine sediments can be expressed in the useful form of $$Eh-pS^{--}$$ diagrams (at constant pH and $$P_{CO_{2}}), calculated from thermodynamic data.
Journal ArticleDOI
Orientation of framboidal pyrite in shale
TL;DR: This article used a stereographic method of reconstruction in which the lineations within the framboids were measured on each of three planes cut mutually at right angles from the rock samples and the explanation for this preferred orientation is not yet known, but it may originate from crystal growth during compaction of the shales.