Articles | Volume 35, issue 2
https://doi.org/10.5194/ejm-35-171-2023
https://doi.org/10.5194/ejm-35-171-2023
Research article
 | 
21 Mar 2023
Research article |  | 21 Mar 2023

Pervasive carbonation of peridotite to listvenite (Semail Ophiolite, Sultanate of Oman): clues from iron partitioning and chemical zoning

Thierry Decrausaz, Marguerite Godard, Manuel D. Menzel, Fleurice Parat, Emilien Oliot, Romain Lafay, and Fabrice Barou

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Cited articles

Aftabi, A. and Zarrinkoub, M. H.: Petrogeochemistry of listvenite association in metaophiolites of Sahlabad region, eastern Iran: Implications for possible epigenetic Cu–Au ore exploration in metaophiolites, Lithos, 156–159, 186–203, https://doi.org/10.1016/j.lithos.2012.11.006, 2013. 
Alt, J. C., Schwarzenbach, E. M., Früh-Green, G. L., Shanks, W. C., Bernasconi, S. M., Garrido, C. J., Crispini, L., Gaggero, L., Padrón-Navarta, J. A., and Marchesi, C.: The role of serpentinites in cycling of carbon and sulfur: Seafloor serpentinization and subduction metamorphism, Lithos, 178, 40–54, https://doi.org/10.1016/j.lithos.2012.12.006, 2013. 
Andreani, M., Luquot, L., Gouze, P., Godard, M., Hoisé, E., and Gibert, B.: Experimental Study of Carbon Sequestration Reactions Controlled by the Percolation of CO2-Rich Brine through Peridotites, Environ. Sci. Technol., 43, 1226–1231, https://doi.org/10.1021/es8018429, 2009. 
Auclair, M., Gauthier, M., Trottier, J., Jebrak, M., and Chartrand, F.: Mineralogy, geochemistry, and paragenesis of the Eastern Metals serpentinite-associated Ni-Cu-Zn deposit, Quebec Appalachians, Econ. Geol., 88, 123–138, https://doi.org/10.2113/gsecongeo.88.1.123, 1993. 
Austrheim, H., Corfu, F., and Renggli, C. J.: From peridotite to fuchsite bearing quartzite via carbonation and weathering: with implications for the Pb budget of continental crust, Contrib. Mineral. Petrol., 176, 94, https://doi.org/10.1007/s00410-021-01851-z, 2021. 
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Short summary
The carbonation of peridotites occurs during the fluxing of reactive CO2-bearing fluids, ultimately producing listvenites (magnesite and quartz assemblage). We studied the most extended outcrops of listvenites worldwide, found at the base of the Semail Ophiolite (Oman). Our study highlights the partitioning of iron during early pervasive carbonation revealed by chemical zoning in matrix magnesites, and we discuss the conditions favoring the formation of Fe-rich magnesite.