Abstract
In the southeastern Oman Mountains the mantle section of the Samail ophiolite is unconformably capped by large units of Maastrichtian to Eocene limestones deposited in a shallow marine environment after ophiolite emplacement. In the vicinity of the town of Fins, a deep canyon carved by a stream has exposed mantle sections of the ophiolite. This section is composed of altered peridotites with high concentrations of calcium and small enrichments of silica compared to the Samail mantle protolith suggesting that the peridotites reacted with a hydrous fluid derived from interaction of seawater with the overlying sediments composed of limestones with minor amounts of chert. This is further affirmed by average δ13C (−0.25‰VPDB) δ18O (−5.53‰VPDB) and 87Sr/86Sr (0.70788) in the carbonate veins, consistent with values in the sediments. Clumped isotope thermometry on calcite veins in peridotite establish that they formed at 25–60 °C. Reaction path modeling of carbonate-quartz derived fluids with peridotite reproduces the observed mineral assemblage composed of carbonate and serpentine with similar Mg# and MgO/SiO2 at high water to rock ratios, with carbon, H2O and silica added to the rock by the reacting fluid.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
