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TitleComment on the "Self-accelerating dolomite-for-calcite replacement model: Self-organized dynamics of burial dolomitization and associated mineralization"
 
AuthorMorrow, D W
SourceAmerican Journal of Science vol. 318, no. 8, 2018 p. 882-886, https://doi.org/10.2475/08.2018.03
Image
Year2018
Alt SeriesNatural Resources Canada, Contribution Series 20180137
PublisherAmerican Journal of Science (AJS)
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProgramGEM2: Geo-mapping for Energy and Minerals Mackenzie Corridor, Shield-to-Selwyn geo-transect, Mackenzie-Selwyn sub-activity
Released2018 11 02
AbstractA model for self-accelerating burial dolomitization proposed by Merino and Canals (2011) invokes a process of dolomitization via a dolomite crystal-growth-driven, pressure solution dissolution of calcite, rather than by dolomite precipitation following calcite dissolution in an open fluid-rock system. Their postulated exponential increase in the saturation of dolomite in solution, and massive dolomite precipitation during dolomitization, is not in accord with experimental data. Calcite precipitation during postulated increases in Ca2+ in solution, occasioned by the hypothesized volume conservative pressure driven dolomitization of calcite, will preclude extensive dolomite precipitation. The generally destructive character of dolomitization and the presence of porosity in many “zebra fabric” saddle dolomites within hydrothermal burial dolomites indicate that dolomitization does proceed in a more open system solution and precipitation environment than that proposed by Merino and Canals (2011).
Summary(Plain Language Summary, not published)
The origin of the mineral dolomite is a long-standing subject of scientific debate, with implications for the formation of porosity in hydrocarbon and groundwater reservoirs. This manuscript provides critical commentary on a recently proposed model for the origin of dolomite. The model is shown to be at odds with well documented experimental (and field?) data.
GEOSCAN ID308429

 
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