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2011

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/52945

Self-accelerating dolomite-for-calcite replacement: Self-organized dynamics of burial dolomitization and associated mineralization

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Abstract

A new dynamic model of dolomitization predicts a multitude of textural, paragenetic, geochemical and other properties of burial dolomites. The model is based on two postulates, (1) that the dolomitizing brine is Mg-rich but under saturated with both calcite and dolomite, and (2) that the dolomite-for-calcite replacement happens not by dissolution-precipitation as usually assumed, but by dolomite-growth-driven pressure solution of the calcite host. Crucially, the dolomite-for-calcite replacement turns out to be self-accelerating via Ca2 : the Ca2 released by each replacement increment accelerates the rate of the next, and so on. As a result, both pore-fluid Ca2 and replacement rate grow exponentially.

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Dolomia, Diagènesi

Subject (English)

Dolomite, Diagenesis

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Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

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MERINO, Enrique and CANALS I SABATÉ, Àngels. Self-accelerating dolomite-for-calcite replacement: Self-organized dynamics of burial dolomitization and associated mineralization. American Journal of Science. 2011. Vol. 311, num. 573-607. ISSN 0002-9599. [consulted: 13 of June of 2026]. Available at: https://hdl.handle.net/2445/52945

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