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AuthorAl Disi, Zulfa Ali
AuthorSadooni, Fadhil
AuthorAl-Kuwari, Hamad Al Saad
AuthorBontognali, Tomaso R.R.
Available date2023-09-07T07:36:38Z
Publication Date2023-12-01
Publication NameScience of the Total Environment
Identifierhttp://dx.doi.org/10.1016/j.scitotenv.2023.165820
CitationAl Disi, Z. A., Sadooni, F., Al-Kuwari, H. A. S., & Bontognali, T. R. (2023). Microbially influenced formation of anhydrite at low temperature. Science of The Total Environment, 902, 165820.‏
ISSN00489697
URIhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85168016298&origin=inward
URIhttp://hdl.handle.net/10576/47320
AbstractCalcium sulfate minerals are abundant in nature – on Earth and on Mars – and important in several fields of material sciences. With respect to gypsum and bassanite, anhydrite represents the anhydrous crystalline phase in the CaSO4–H2O system. Despite years of research, the formation of anhydrite in the laboratory at low temperature remains challenging and, in the geological record, this mineral is mostly interpreted as a secondary phase that form through metamorphic dehydration of gypsum. Here, we present the results of laboratory precipitation experiments showing that anhydrite can form at 35 °C from evaporated seawater through a microbially influenced mineralization process. The experiments were conducted in the presence of extracellular polymeric substances (EPS) produced by bacterial strains isolated from a modern evaporitic environment, the Dohat Faishakh sabkha in Qatar. Without organic molecules, only gypsum formed in parallel control experiments. This finding provides a possible explanation for the origin of several natural occurrences of anhydrite that cannot be satisfactorily explained by existing models and reveals a new precipitation pathway that may have industrial applications.
SponsorThis publication was made possible by the grant NPRP13S-0207-200291 from the Qatar National Research Fund (a member of the Qatar Foundation). The statements made herein are solely the responsibility of the authors.
Languageen
PublisherElsevier B.V.
SubjectAnhydrite
Bassanite
EPS
Evaporation
Gypsum
Mars
TitleMicrobially influenced formation of anhydrite at low temperature
TypeArticle
Volume Number902
dc.accessType Abstract Only


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