Dolomitized marble (Gouverneur Marble, New York (state)) - dolomitization by hydrothermal fluids
Geological process producing dolomite
Dolomitization is a geological process by which the carbonate mineral dolomite is formed when magnesium ions replace calcium ions in another carbonate mineral, calcite. It is common for this mineral alteration into dolomite to take place due to evaporation of water in the sabkha area.[1] Dolomitization involves substantial amount of recrystallization. This process is described by the stoichiometric equation:[2]
Dolomitization depends on specific conditions which include low Ca:Mg ratio in solution, reactant surface area, the mineralogy of the reactant, high temperatures which represents the thermodynamic stability of the system, and the presence of kinetic inhibitors such as sulfate.[2]
If the kinetic inhibitors and high temperatures are compatible, then dolomitization can take place in saline environments above thermodynamic and kinetic saturation with respect to dolomite. This type of environment includes, freshwater and seawater mixing zones, normal saline to hypersaline subtidal environments, schizohaline environments (fluctuating salinity: fresh-water to hypersaline conditions) and hypersaline supratidal environments. When requirements are fulfilled, dolomitization can take place in alkaline environments which are those under the influence of bacterial reduction and fermentation processes, and areas with high input alkaline continental groundwaters. Environments with high temperatures (about 50 °C) such as subsurface and hydrothermal environments are conducive to dolomitization.[1][3][4]
Dolomitization is a geological process by which the carbonate mineral dolomite is formed when magnesium ions replace calcium ions in another carbonate...
are important as sites where dolomitization of calcite occurs. Several models have been proposed for the dolomitization of calcite and aragonite within...
estuary environments (Dorag dolomitization). However, Dorag dolomitization has fallen into disfavor as a mechanism for dolomitization, with one 2004 review...
olivine group, with hydration and changes in pressure as major factors. Dolomitization refers to the varied suggested manners in which a predominantly calcite...
Dolomite is a double carbonate, with the formula CaMg(CO3)2. Secondary dolomitization of limestone is common, in which calcite or aragonite are converted...
diagenesis, except in rare cases such as dissolution of minerals and dolomitization. The study of diagenesis in rocks is used to understand the geologic...
geologists Haidinger is known especially for his postulate of the "dolomitization" reaction that would change calcium carbonate into dolomite at low temperatures...
Subsequent demonstration of an artificial means of creating the de-dolomitization observed on the stone has prompted a number of art historians to revise...
the hydrology and the co-existing carbonate phase from site of recent dolomitization the coastal sabkha of Abu Dhabi, Persian Gulf (Doctoral Thesis thesis)...
the Middle Miocene Pedro Castle Member. Caymanite deposition predated dolomitization, a process where limestone is altered from contact with magnesium-rich...
Jiang, Ganqing (2018-06-01). "The Tonian Beck Spring Dolomite: Marine dolomitization in a shallow, anoxic sea". Sedimentary Geology. 368: 83–104. Bibcode:2018SedG...
Osagian white bioclastic limestone, oolitic calcarenite, occasionally dolomitized; anhydrite in the Williston Basin 183 m (600 ft) Lodgepole Formation...
calcite has been converted to dolomite, CaMg(CO3)2, and in a few cases the dolomitized chalk has been dedolomitized back to calcite. Chalk is highly porous...
dominance: sandstone, clays with paleosols and sandstone limestones sometimes dolomitized, with marmorized levels in paleosols towards the northern region of Ghnim...
Hall, M. R.; Steer, E. and Vandeginste, A. (2019): Acceleration of dolomitization by zinc in saline waters. Nature Communications, vol.10, 1851. Ehlmann...
subjected to dolomitization during diagenesis, which increased their porosity, and they now consist of dolomite rather than limestone. The dolomitization that...
and the lower part of the outcrop consists of thick-layered yellow dolomitized limestone of the Saka Member. Tammekann, August (1926). Die Oberflächengestaltung...
"Geothermal springs of the West Florida continental shelf: Evidence for dolomitization and radionuclide enrichment". Earth and Planetary Science Letters. 52...
Gorjanovicia Members. The formation comprises limestones with some levels of dolomitization. The succession starts with a sequence of stromatolites and is heavily...
dolomites mostly retain their original sedimentary textures despite dolomitization. The sedimentary structures include wavy and asymmetric ripple laminations...
BRENNAN-ALPERT, A. DESROCHERS, R. BERTRAND (December 2005). "Hydrothermal dolomitization in the Lower Ordovician Romaine Formation" (PDF). Bulletin of Canadian...
sabkha the gypsum can be altered to anhydrite and the aragonite can be dolomitized diagenetically. Thermal contraction at night and expansion during the...
without additional support. The collapse can occur during diagenesis and dolomitization. The magnetosome shape and elastic properties of biological membranes...
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