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Communication Dans Un Congrès Année : 2013

Controls of Ca/Mg/Fe activity ratios in pore water chemistry models of the Callovian--Oxfordian Clay Formation

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Résumé

The pore water chemistry model of the Callovian-Oxfordian clay formation considers that the divalent Ca, Mg and Fe cations are controlled by equilibrium reactions with pure carbonates: calcite for Ca, dolomite for Mg and siderite for Fe. Results of a petrological study and the Ca/Mg and Ca/Fe activity ratios computed based on natural pore water chemistry provide evidence that equilibrium with pure calcite and pure dolomite is a reasonable assumption for undisturbed pore waters; on the other hand siderite cannot be considered at equilibrium with pore waters at the formation scale.

Dates et versions

hal-00781650 , version 1 (28-01-2013)

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Catherine Lerouge, Agnès Vinsot, Sylvain Grangeon, Guillaume Wille, Christine Fléhoc, et al.. Controls of Ca/Mg/Fe activity ratios in pore water chemistry models of the Callovian--Oxfordian Clay Formation. Fourteenth International Symposium on Water-Rock Interaction, WRI 14, Jun 2013, Avignon, France. pp.475-478, ⟨10.1016/j.proeps.2013.03.133⟩. ⟨hal-00781650⟩

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