Restricted internal oxygen isotope exchange in calcite veins: Constraints from fluid inclusion and clumped isotope-derived temperatures

The distribution of oxygen isotopes between calcite and fluid inclusions has demonstrated utility for reconstructing near-surface precipitation temperatures. For that formed at depth, however, the resilience this paleothermometer to diagenetic isotope alteration is poorly constrained. Clumped also document temperatures are similarly vulnerable alteration. Post-entrapment exchange fluid-inclusions could alter calcite-fluid (?c-fi), as well clumped composition (?47) calcite, therefore these two seemingly independent paleo-thermometers potentially linked via same process. Using closed-system batch fractionation equations, we have modelled various scenarios water host-rock during burial, internal exhumation. Assuming both record concordant time vein formation, our models predict if a fraction available isotopic interaction with inclusions, inclusion isotope-derived paleothermometers yield discrepant temperature estimates after We show thermometer more sensitive than mass balance determines sensitivity vulnerability (?18Ofi) overprinting. applied coupled measurements on veins from External Albanides (Albania), which were depth subsequently exhumed, in order compare natural samples model. These strongly calcite-water equilibrium temperatures, suggesting fluids may indeed be key parameter Even though appear insensitive towards exchange, model predicts low burial carbonate susceptible by under certain conditions.