Geothermal convection: a mechanism for dolomitization at Enewetak Atoll?
By: A.M. Wilson, W. Sanford, F. Whitaker, and 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.
| Publication type | Book |
|---|---|
| Publication Subtype | Conference publication |
| Title | Geothermal convection: a mechanism for dolomitization at Enewetak Atoll? |
| DOI | 10.1016/S0375-6742(00)00048-0 |
| Volume | 69-70 |
| Year Published | 2000 |
| Language | English |
| Publisher | Elsevier Science Publishers B.V. |
| Publisher location | Amsterdam, Netherlands |
| Larger Work Title | Journal of Geochemical Exploration |
| First page | 41 |
| Last page | 45 |
| Conference Title | Geofluids III - 3rd International Conference on Fluid Evolution, Migration and Interaction in Sedimentary Basins and Orogenic Belts |
| Conference Location | Barcelona, Spain |
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