δ60Ni and δ13C Composition of Serpentinites and Carbonates of the Tekirova Ophiolite, Turkey, and Meatiq Ophiolite, Egypt

Nickel isotope fractionation patterns in continental ultramafic environments generally show a depletion of δ 60 Ni weathered rocks and an enrichment bedrock samples. The present study focuses on stable carbonate-rich, ophiolite samples with concomitant fluids at active serpentinization site southwestern Turkey, comparison to results from inactive the Eastern Desert Egypt carbonate-rich All solid phase data area are consistent previously reported values serpentinites, whereas precipitates (SW Turkey) give slightly heavier than data. However, isotopic signatures system likely reflect scavenging light by iron oxide carbonate precipitation, as has been demonstrated laboratory coprecipitation experiments. It is also possible that resemble previous experimental relatively strong initial between solids, which then diminishes time due aging precipitates.