| Title | Comment on the "Self-accelerating dolomite-for-calcite replacement model: Self-organized dynamics of burial dolomitization and associated mineralization" |
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| Author | Morrow, D W |
| Source | American Journal of Science vol. 318, no. 8, 2018 p. 882-886, https://doi.org/10.2475/08.2018.03 |
| Image |  |
| Year | 2018 |
| Alt Series | Natural Resources Canada, Contribution Series 20180137 |
| Publisher | American Journal of Science (AJS) |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Program | GEM2: Geo-mapping for Energy and Minerals Mackenzie Corridor, Shield-to-Selwyn geo-transect, Mackenzie-Selwyn sub-activity |
| Released | 2018 11 02 |
| Abstract | A 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 ID | 308429 |
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