Systematic laboratory approach to produce Mg-rich carbonates at low temperature

Al Disi, Zulfa Ali and Zouari, Nabil and Attia, Essam and Al-Asali, Mazen and Al-Kuwari, Hamad Al Saad and Sadooni, Fadhil and Dittrich, Maria and Bontognali, Tomaso R. R.. (2021) Systematic laboratory approach to produce Mg-rich carbonates at low temperature. RSC Advances, 11 (59). pp. 37029-37039.

Full text not available from this repository.

Official URL: https://edoc.unibas.ch/87738/

Downloads: Statistics Overview


Dolomite is a common Mg-rich carbonate in the geological record, but the mechanism of its formation remains unclear. At low temperature, the incorporation of magnesium ions into the carbonate minerals necessary to form dolomite is kinetically inhibited. Over the decades, several factors that possibly allow for overcoming this kinetic barrier have been proposed, and their effectiveness debated. Here, we present the results of a large number of laboratory precipitation experiments that have been designed to identify and compare the factors that promote the formation of Mg-rich carbonates. Under the tested conditions, the most interesting observations include: (1) from solutions that mimic evaporitic seawater, the maximum mol% of Mg incorporated in high Mg calcite is 35, (2) carbonates with a mol% of Mg above 40 were obtained exclusively in the presence of organic molecules, (3) no correlation was observed between the charge of the organic molecules and the incorporation of Mg, (4) the mode (i.e., slow vs. fast mixing) used to add carbonate to the solution obtaining supersaturation has a significant impact on the forming mineral phase (aragonite vs. nesquehonite vs. high Mg calcite) and its Mg content. These findings allow for a more informed evaluation of the existing models for dolomite formation, which are based on the study of natural environments and ancient sedimentary sequences.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Physiogeographie und Umweltwandel (Kuhn)
UniBasel Contributors:Bontognali, Tomaso
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:10 Feb 2022 07:55
Deposited On:10 Feb 2022 07:55

Repository Staff Only: item control page