Journal ArticleDOI
Europium redox equilibria in aqueous solution
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In this paper, the relative stability of europium in aqueous solution at elevated temperatures and pressures is predicted, and the predicted stability of divalent Europium is consistent with the large positive europity anomalies in rare earth element patterns of high-temperature barites of hydrothermal and metamorphic origin reported by Guichard et al. [5] and with the observed depletion of euro pium as a result of hightemperature sericitization of feldspar-bearing assemblages discovered by Alderton et al., which is suggestedAbout:
This article is published in Earth and Planetary Science Letters.The article was published on 1984-01-01. It has received 718 citations till now. The article focuses on the topics: Europium & Aqueous solution.read more
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The geochemical evolution of the continental crust
TL;DR: A survey of the dimensions and composition of the present continental crust is given in this paper, where it is concluded that at least 60% of the crust was emplaced by the late Archean (ca. 2.7 eons).
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Distribution of yttrium and rare-earth elements in the Penge and Kuruman iron-formations, Transvaal Supergroup, South Africa
Michael Bau,Peter Dulski +1 more
TL;DR: In this article, a sequence of eleven adjacent samples (each comprising less than ten microbands) from the Kuruman and Penge Iron-Formations (IFs) in the Late-Archaean to Early-Palaeoproterozoic Transvaal Supergroup display pronounced heavy rare-earth element enrichment, and positive anomalies of LaSN, EuSN, GdSN, YSN, ErSN, but neither positive nor negative CeSN anomalies.
Journal ArticleDOI
Rare-earth element mobility during hydrothermal and metamorphic fluid-rock interaction and the significance of the oxidation state of europium
TL;DR: In this paper, the Eu 3+ Eu 2+ redox boundary for temperatures up to 600°C and pressures up to 4000 bar has been calculated using the revised HKF model for the prediction of the molal Gibbs free energy of formation at elevated pressures and temperatures.
Journal ArticleDOI
The aqueous geochemistry of the rare-earth elements and yttrium
TL;DR: Theoretical considerations suggest that trivalent REE and Y should exhibit strong, predominantly electrostatic complexing with hard ligands such as fluoride, sulfate, phosphate, carbonate and hydroxide and this is borne out by the available experimental data.
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The rainbow vent fluids (36°14′N, MAR): the influence of ultramafic rocks and phase separation on trace metal content in Mid-Atlantic Ridge hydrothermal fluids
Eric Douville,Jean-Luc Charlou,Eric H. Oelkers,P Bienvenu,C.F Jove Colon,Jean-Pierre Donval,Yves Fouquet,Daniel Prieur,Pierre Appriou +8 more
TL;DR: In this paper, the authors collected from the Rainbow vent field (36°14′N) on the Mid-Atlantic Ridge (MAR) during the 1997 diving FLORES cruise, which is composed of ∼10 black smokers emitting acidic fluids at 365 °C.
References
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Theoretical prediction of the thermodynamic behavior of aqueous electrolytes by high pressures and temperatures; IV, Calculation of activity coefficients, osmotic coefficients, and apparent molal and standard and relative partial molal properties to 600 degrees C and 5kb
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Slaty cleavage and related strain in Martinsburg Slate, Delaware Water Gap, New Jersey
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Thermodynamics of hydrothermal systems at elevated temperatures and pressures
TL;DR: In this article, sufficient thermodynamic data are available to permit calculation of equilibrium constants for a large number of hydrothermal reactions, where the calculations involve entropy estimates, application of average heat capacities, and/or assumptions concerning the temperature dependence of thermodynamic variables and the relative importance of electrostatic and non-electrostatic interaction among the species.
Journal ArticleDOI
The equilibrium speciation of dissolved components in freshwater and sea water at 25°C and 1 atm pressure
TL;DR: In this paper, a data base summarising the stability constants of more than 500 complexes is used to calculate speciation pictures for 58 trace elements in model seawater (pH 8.2) and freshwaters (PH 6 and 9).
Journal ArticleDOI
Theoretical prediction of the thermodynamic behavior of aqueous electrolytes at high pressures and temperatures; I, Summary of the thermodynamic/electrostatic properties of the solvent
TL;DR: In this article, the thermodynamic/electrostatic properties of H 20 at high pressures and temperatures were calculated from regression equations representing dielectric constant data reported by Oshry (ms), Owen and others (1961), and Heger (lllS) for temperatures and pressures froln 0.001 to 5 kb together with finite difference derivatives computed from specific vC9lullles given by Burnham, Hollo,vay, and Davis (1969b) for 20° to 900°C and 1 to 10 kb.
Related Papers (5)
Rare-earth element mobility during hydrothermal and metamorphic fluid-rock interaction and the significance of the oxidation state of europium
Distribution of yttrium and rare-earth elements in the Penge and Kuruman iron-formations, Transvaal Supergroup, South Africa
Michael Bau,Peter Dulski +1 more