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pyrite formation rate

  • Kinetics of pyrite formation by the H2S oxidation of iron

    At pH = 7, for the same total sulfide and FeS constraints, the rate of pyrite formation 1.5 109 to 1.5 104 mol FeS2 per g sediment per year. In hydrothermal systems, such as deep ocean vents, the rate of pyrite formation by oxidation of FeS by H2S at 125 assuming a typical HzS concentration of 1 mM is 3.2 10_6 mol L i s1 per mol FeS.

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  • Pyrite formation from FeS and H2S is mediated through

    To support our hypothesis of microbial involvement in pyrite formation in culture J5, we followed its ironsulfur mineral transformation over a temperature gradient of 4 °C to 60 °C. The maximum of pyrite formation was evident at 28 °C.

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  • Sedimentary pyrite formation: An update ScienceDirect

    Abstract. HOWARTH R. W. (1979) Pyrite: its rapid formation in a salt Sedimentary pyrite formation 615 marsh and its importance to ecosystem metabolism. Science 203,4951. tGENSEN B. B. (1978) A comparison of methods for the quantification of bacterial sulfate reduction in coastal ma

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  • Coupled partitioning of Au and As into pyrite controls

    The partitioning of As and Au into pyrite was studied by replacing siderite (FeCO 3) by pyrite (FeS 2) by reacting the Fe carbonate with H 2 Scontaining aqueous fluids under experimental conditions similar to those of CTGD formation (i.e., 200°C, fluiddominated conditions, 0.05 m H 2 S, and slightly acidic see Materials and Methods for

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  • Fe(III):S(II) Concentration Ratio Controls the Pathway

    In hydrothermal systems, such as deep ocean vents, the rate of pyrite formation by oxidation of FeS by H2S at 125°C assuming a typical H2S concentration of 1 mM is 3.2 × 106 mol L1 s1

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  • Mechanisms of sedimentary pyrite formation Request PDF

    The mechanisms of pyrite formation are reviewed. Advances since 1994 in our understanding of the mechanisms and rate of pyrite formation, the role of bacteria in the formation of pyrite, framboid

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  • Kinetics of pyrite formation by the H 2S oxidation of iron

    Abstract. In hydrothermal systems, such as deep ocean vents, the rate of pyrite formation by oxidation of FeS by H S at 125°C assuming a typical H S concentration of 1 mM is 3.2 × 10 mol L s per mol FeS. A 1 million tonne pyrite deposit could form from a solution containing 1 mmol FeS and 1 mmol H S by this process in 1000 years at a flow rate...

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  • Pyrite Wikipedia

    Pyrite cubic crystals on marl from Navajún, La Rioja, Spain (size: 95 by 78 millimetres (3.7 by 3.1 in), 512 grams (18.1 oz) main crystal: 31 millimetres (1.2 in) on edge)

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  • (PDF) Mechanisms of sedimentary pyrite formation Martin

    However, the estimated rate of manganese compounds with oxidations states in excess of +II pyrite formation in the presence of H2S is on the order of decades would have been exhausted as electron acceptors before sulfate to centuries, rather than hours as predicted on the basis of the rate reduction, and, by extension, pyrite formation becomes impor laws derived by Rickard (1997) and Rickard and

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  • Mechanisms of sedimentary pyrite formation Sulfur

    Mechanisms of sedimentary pyrite formation. The reaction rate as determined in the field is orders of magnitude slower than in laboratory experiments, and questions remain about the role of the FeS surface and the electron acceptor involved in the conversion. It is also becoming increasingly clear that sulfatereducing bacteria play...

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