| 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. (C) 2000 Elsevier Science B.V. All rights reserved.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 approx. 16 My. Calcium enrichment of pore fluids and upward transport of these fluids is established early, prior to 30 ky. |
| Genre: | Conference Paper |
| ProdID: | 70022676 |
| Citation Author: | Wilson, A. M.; Sanford, W.; Whitaker, F.; Smart, P. |
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| Citation End Page: | 45 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Geochemical Exploration |
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| Citation Number Of Pages: | 5 |
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| Citation Publisher: | Elsevier Science Publishers B.V. |
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| Citation Search Results Text: | Geothermal convection: A mechanism for dolomitization at Enewetak Atoll?; 2000; Conference Paper; Journal of Geochemical Exploration; Wilson, A. M.; Sanford, W.; Whitaker, F.; Smart, P. |
| Citation Start Page: | 41 |
| Citation Volume: | 69-70 |
| Citation Year: | 2000 |
| Type: | citation/reference |
| Text: | Geothermal convection: A mechanism for dolomitization at Enewetak Atoll?; 2000; Conference Paper; Journal of Geochemical Exploration; Wilson, A. M.; Sanford, W.; Whitaker, F.; Smart, P. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/S0375-6742(00)00048-0 |
| Date Other: | Sat, 1 Jan 2000 00:00 -0600 |
| Publisher: | Elsevier Science Publishers B.V. |
