A route for the direct crystallization of dolomite
By J. Rodriguez-Blanco, S. Shaw, L. Benning. 2015
145 citations recorded by the source corpus.
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.
Subfields: Biomaterials, Inorganic Chemistry, Paleontology
View Paper: https://www.semanticscholar.org/paper/8366d54142b59f9d2398fde09cb7b5478257a673
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In Paleontology
Citations in the corpus
- Carbonate and silicate biomineralization in a hypersaline microbial mat (Mesaieed sabkha, Qatar): Roles of bacteria, extracellular polymeric substances and viruses (2018, background): “…studies of mats and laboratory experiments involving bacteria and cultures (Sánchez-Román et al., 2011; Krause et al. 2012; Zhang et al., 2012a,b; Rodriguez-Blanco et al., 2015), these spheroids are composed of dolomite or a very high Ca-Mg carbonate (VHMC) interpreted as a precursor to dolomite…”