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المؤلفAl Disi, Zulfa Ali
المؤلفSadooni, Fadhil
المؤلفAl-Kuwari, Hamad Al Saad
المؤلفBontognali, Tomaso R.R.
تاريخ الإتاحة2023-09-07T07:36:38Z
تاريخ النشر2023-12-01
اسم المنشورScience of the Total Environment
المعرّفhttp://dx.doi.org/10.1016/j.scitotenv.2023.165820
الاقتباسAl 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.‏
الرقم المعياري الدولي للكتاب00489697
معرّف المصادر الموحدhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85168016298&origin=inward
معرّف المصادر الموحدhttp://hdl.handle.net/10576/47320
الملخصCalcium 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.
راعي المشروعThis 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.
اللغةen
الناشرElsevier B.V.
الموضوعAnhydrite
Bassanite
EPS
Evaporation
Gypsum
Mars
العنوانMicrobially influenced formation of anhydrite at low temperature
النوعArticle
رقم المجلد902
dc.accessType Abstract Only


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