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Journal ArticleDOI

Framboidal sulphides precipitated synthetically

01 Aug 1970-Mineralium Deposita (Springer-Verlag)-Vol. 5, Iss: 3, pp 237-247
TL;DR: In this paper, the formation of framboids is considered to be a normal result of the precipitation of discrete sulphide particles in suspension from reactants in true solution at a concentration between twice and ten times the solubility of the sulphides.
Abstract: Framboidal sulphides of iron, copper, lead, zinc, nickel and arsenic have been precipitated from aqueous solutions by hydrogen sulphide in the absence of any bacterial agency. The formation of framboids is considered to be a normal result of the precipitation of discrete sulphide particles in suspension from reactants in true solution at a concentration between twice and ten times the solubility of the sulphides. The preservation of framboids demands protection from further access to a solvent within a few days of precipitation. The significance of the formation and preservation of framboids in sedimentary and magmatic rocks and in the genesis of stratiform sulphide ores is discussed and the role of organic material in sediments is suggested.
Citations
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Journal ArticleDOI

1,235 citations

Journal ArticleDOI
TL;DR: In this article, the stability of colloidal, iron monosulfide suspensions with ionic strengths typical of marine and lacustrine waters was evaluated using DLVO theory and a term was included to account for the ferrimagnetic properties of greigite.

639 citations

Journal ArticleDOI
TL;DR: Pyrite formation has been investigated at 70°C and pH 6-8 by aging precipitated, disordered mackinawite, Fe9S8, and greigite in solutions containing aqueous H2S, HS, Sx2−, S2O32−, SO32− and colloidal elemental sulfur as discussed by the authors.

445 citations

Journal ArticleDOI
TL;DR: In this article, a detailed magnetostratigraphic study of Late Neogene siliciclastic sediments of the Awatere Group, South Island, New Zealand (41°45′S, 174°05′E) has revealed a wide range of palaeomagnetic behaviour.

315 citations

Journal ArticleDOI
TL;DR: In this paper, the authors provide a treatment for the full range of diagenetic environments, including oxic, manganiferous, ferruginous, and methanic.

281 citations

References
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Book
01 Jan 1965
TL;DR: In this article, the authors provide a thorough, up-to-date coverage of controls on the chemical quality of surface and ocean waters. But they do not provide a detailed analysis of the results of their experiments.
Abstract: Fluid-mineral Equilibria in Hydrothermal SystemsOn the Origin of the Black Pyritic Slates from the Iron Mineral Deposits of Iron River District of MichiganPetrogenesis of Metamorphic RocksSolutions, Minerals, and EquilibriaHandbook of Soil Sciences (Two Volume Set)Contact MetamorphismGeochemistry and Mineral Formation in the Earth SurfaceGeochemistry, Groundwater and PollutionThermodynamic Modeling of Geologic MaterialsWater ResearchMineral ExplorationHydrochemical Balances of Freshwater SystemsMontmorillonite Genesis in Soils as Influenced by the Activities of Monosilicic Acid and Various Cations in the Matrix SolutionWater-resources InvestigationsThermodynamics in Earth and Planetary SciencesSolution ChemistryCourses and DegreesMineral Equilibria at Low Temperature and PressureAqueous Environmental GeochemistrySoil Solutions, Minerals, and EquilibriaProceedings of the Fourth International Symposium on Electrochemistry in Mineral and Metal ProcessingThermodynamics of Minerals and MeltsSulfide Mineralogy and GeochemistryIncomplete SolutionPhysical GeographyPHREEQEStockholm Contributions in GeologyPetrogenesis of Metamorphic RocksSolutions, Minerals, and EquilibriaEquilibres des minéraux et de leurs solutions aqueusesPhosphate MineralsSolutions, Minerals, and EquilibriaBulletin de MinéralogieEquilibrium Activity DiagramsThe American Journal of ScienceCharacterization of Metamorphism through Mineral EquilibriaSOLUTIONS, MINERALS & EQUILIBRIA.Composition of Holocene Sands of Mull and Adjacent Offshore AreasGeochemistry InternationalOxidation of Pyrite in Alkaline Solutions and Heterogeneous Equilibria of Sulfurand Arseniccontaining Minerals in Cyanide Solutions This book offers thorough, up-to-date coverage of controls on the chemical quality of surface and

2,462 citations

Book
01 Jan 1958
TL;DR: I: Geochemistry of Crystal Phases 1: Elemental Properties and Crystal Chemistry 2: Concepts of Chemical Thermodynamics 3: Thermochemistry of Crystalline Solids 4: Some Concepts of Defect Chemistry 5: Silicates II: Geochemical of Silicate Melts 6: SilicateMelts 7: Introduction to Petrogenetic Systems III: Geochemics of Fluids 8: Geography of Aqueous Phases 9: Chemical Chemistry of Gaseous Phasing IV: Methods 10: Trace Element Geochemistry 11: Isotope Geochemistry Appendix 1:
Abstract: I: Geochemistry of Crystal Phases 1: Elemental Properties and Crystal Chemistry 2: Concepts of Chemical Thermodynamics 3: Thermochemistry of Crystalline Solids 4: Some Concepts of Defect Chemistry 5: Silicates II: Geochemistry of Silicate Melts 6: Thermochemistry of Silicate Melts 7: Introduction to Petrogenetic Systems III: Geochemistry of Fluids 8: Geochemistry of Aqueous Phases 9: Geochemistry of Gaseous Phases IV: Methods 10: Trace Element Geochemistry 11: Isotope Geochemistry Appendix 1: Constants, Units and Conversion Factors Appendix 2: Review of Mathematics

2,060 citations

Book
01 Jan 1964

872 citations

Journal ArticleDOI
TL;DR: In this article, three diagenetic models based on layered situations are presented to illustrate factors affecting migration of iron and sulfur in recent anaerobic sediments, including sharp variation with depth of organic matter content and original concentration of reactive (toward H 2 S) ferruginous material.
Abstract: Three diagenetic models based on layered situations are presented to illustrate factors affecting migration of iron and sulfur in recent anaerobic sediments. Two important factors are sharp variation with depth of organic matter content, which is assumed to be the same in each model, and the original concentration of reactive (toward H 2 S) ferruginous material, which is varied between models. Juxtaposed artificial sediments of greatly differing organic matter content undergo quantitative changes in the laboratory predicted by the three models. The experiments also demonstrate quantitatively the general validity of the low iron-content model. The same reasoning applied to layer models can be recast in a three-dimensional context to describe changes in organic-poor sediment surrounding an organic-rich body.

162 citations

Journal ArticleDOI
TL;DR: Curtis et al. as discussed by the authors combined laboratory and field data on recent sedimentary environments to produce mineral stability diagrams and found that only ferrous compounds can be truly stable in depositional water, whereas anion activity (sulfide and carbonate) appears to be the most important chemical control.
Abstract: An attempt to combine laboratory and field data on recent sedimentary environments to produce mineral stability diagrams suggests that two distinct situations may be recognized. In depositional water, only ferric compounds can be truly stable. In interstitial water, beneath the sediment-water interface, ferrous compounds (pyrite, pyrrhotite, magnetite, siderite, and chamosite) are stable. Anion activity (sulfide and carbonate) appears to be the most important chemical control. The theoretical findings (Pt. 1 by C. D. Curtis) are consistent with interpretation of petrographic observations on Carboniferous and Jurassic ores of the British Isles (Pt. 2 by D. A. Spears).

151 citations