Show simple item record

AuthorAl Disi, Zulfa Ali
AuthorZouari, Nabil
AuthorAttia, Essam
AuthorAl-Asali, Mazen
AuthorAl Saad Al-Kuwari, Hamad
AuthorSadooni, Fadhil
AuthorDittrich, Maria
AuthorBontognali, Tomaso R.R.
Available date2022-03-30T06:09:13Z
Publication Date2021-11-10
Publication NameRSC Advances
Identifierhttp://dx.doi.org/10.1039/d1ra06206a
CitationAl Disi, Z. A., Zouari, N., Attia, E., Al-Asali, M., Al-Kuwari, H. A. S., Sadooni, F., ... & Bontognali, T. R. (2021). Systematic laboratory approach to produce Mg-rich carbonates at low temperature. RSC Advances, 11(59), 37029-37039.
URIhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85120436261&origin=inward
URIhttp://hdl.handle.net/10576/29081
AbstractDolomite 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.
SponsorThis work was made possible by the grants NPRP10-0214-170462 and NPRP13S-0207-200291 from the Qatar National Research Fund (a member of the Qatar Foundation).
Languageen
PublisherRoyal Society of Chemistry
SubjectSabkha
Carbonates
Organic molecules
High magnesium calcite
Protodolomite
Dolomite
TitleSystematic laboratory approach to produce Mg-rich carbonates at low temperature
TypeArticle
Pagination37029-37039
Issue Number59
Volume Number11
ESSN2046-2069
dc.accessType Open Access


Files in this item

Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record