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Geothermal convection: a mechanism for dolomitization at Enewetak Atoll?

By:
, , ,
DOI: 10.1016/S0375-6742(00)00048-0

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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.

Additional Publication Details

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
First page:
41
Last page:
45
Number of Pages:
5
Conference Title:
Geofluids III - 3rd International Conference on Fluid Evolution, Migration and Interaction in Sedimentary Basins and Orogenic Belts
Conference Location:
Barcelona, Spain