Articles | Volume 13, issue 8
Research article
01 Aug 2022
Research article |  | 01 Aug 2022

Progressive veining during peridotite carbonation: insights from listvenites in Hole BT1B, Samail ophiolite (Oman)

Manuel D. Menzel, Janos L. Urai, Estibalitz Ukar, Thierry Decrausaz, and Marguerite Godard

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Pervasive carbonation of peridotite to listvenite (Semail Ophiolite, Sultanate of Oman): clues from iron partitioning and chemical zoning
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Subject area: Tectonic plate interactions, magma genesis, and lithosphere deformation at all scales | Editorial team: Structural geology and tectonics, paleoseismology, rock physics, experimental deformation | Discipline: Structural geology
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Cited articles

Agard, P., Searle, M. P., Alsop, G. I., and Dubacq, B.: Crustal stacking and expulsion tectonics during continental subduction: P-T deformation constraints from Oman, Tectonics, 29, TC5018,, 2010. 
Andreani, M., Baronnet, A., Boullier, A.-M., and Gratier, J.-P.: A microstructural study of a “crack-seal” type serpentine vein using SEM and TEM techniques, Eur. J. Mineral., 16, 585–595, 2004. 
Andreani, M., Mével, C., Boullier, A. M., and Escartín, J.: Dynamic control on serpentine crystallization in veins: Constraints on hydration processes in oceanic peridotites, Geochem. Geophy. Geosy., 8, Q02012,, 2007. 
Ankit, K., Urai, J. L., and Nestler, B.: Microstructural evolution in bitaxial crack-seal veins: A phase-field study, J. Geophys. Res.-Sol. Ea., 120, 3096–3118, 2015. 
Ash, C. H. and Arksey, R. L.: The Atlin ultramafic allochthon: ophiolitic basement within the Cache Creek terrane; tectonic and metallogenic significance, 104N/12, Geological Fieldwork 1989, 1990–1, British Columbia Ministry of Energy, Mines and Petroleum Resources Victoria, BCGS_P1990-01-41_Ash, 365–374, 1989. 
Short summary
Mantle rocks can bind large quantities of carbon by reaction with CO2, but this capacity requires fluid pathways not to be clogged by carbonate. We studied mantle rocks from Oman to understand the mechanisms allowing their transformation into carbonate and quartz. Using advanced imaging techniques, we show that abundant veins were essential fluid pathways driving the reaction. Our results show that tectonic stress was important for fracture opening and a key ingredient for carbon fixation.