We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
A route for the direct crystallization of dolomite.
- Authors
Rodriguez-Blanco, Juan Diego; Shaw, Samuel; Benning, Liane G.
- Abstract
The direct crystallization of dolomite from an aqueous solution at temperatures between 60-220 °C was followed in situ through time-resolved synchrotron-based energy-dispersive X-ray diffraction combined with offline high-resolution imaging, X-ray diffraction, and infrared spectroscopy. Crystalline CaMg(CO3)2 phases form through a three-stage process. In the first stage, a nanoparticulate magnesium-deficient, amorphous calcium carbonate (Mg-ACC) with a nominal formula of Ca0.606Mg0.394CO3·1.37H2O forms. After a temperature-dependent induction time, during stage 2 the Mg-ACC partially dehydrates and orders prior to its rapid (<5 min) crystallization to non-stoichiometric proto-dolomite. This occurs via the dissolution of Mg-ACC, followed by the secondary nucleation of proto-dolomite from solution. The proto-dolomite crystallization proceeds via spherulitic growth that follows a growth front nucleation mechanism with a de-nuovo and continuous formation of nanocrystalline proto-dolomite subunits that form spherical aggregates. In stage three of the reaction, the proto-dolomite transforms to highly crystalline and stoichiometric dolomite on a much longer timescale (hours to days), via an Ostwald-ripening mechanism. Such a three-stage crystallization can explain microbially induced proto-dolomites observed in modern hypersaline settings and may also be the route by which the Cryogenian cap dolomite deposits of the Neoproterozoic formed.
- Subjects
CRYSTALLIZATION; DOLOMITE; SPHERULITES (Petrology); IGNEOUS rocks; CALCIUM carbonate
- Publication
American Mineralogist, 2015, Vol 100, Issue 5/6, p1172
- ISSN
0003-004X
- Publication type
Article
- DOI
10.2138/am-2015-4963