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Geothermal convection: a mechanism for dolomitization at Enewetak Atoll?

A.M. Wilson·W. Sanford·F. Whitaker·P. Smart
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Abstract

Geothermal convection in carbonate platforms could drive massive dolomitization by supplying mass transport of magnesium over long periods and at temperatures high enough to overcome kinetic limitations. Reactive-transport simulations based on Enewetak Atoll show dolomitization in a thin band at a permeability contrast near the base of the platform, which is consistent with field observations of dolomitized Eocene deposits. Dolomitization is predicted at approximately 6% per My at temperatures of 45–60°C, and complete dolomitization could be accomplished in ∼16 My. Calcium enrichment of pore fluids and upward transport of these fluids is established early, prior to 30 ky.

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A.M. Wilson, W. Sanford, F. Whitaker, P. Smart. 2000. Geothermal convection: a mechanism for dolomitization at Enewetak Atoll?. https://doi.org/10.1016/s0375-6742(00)00048-0

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