“…However, in serpentinites with multiple serpentinization events, a whole‐rock approach may not be suitable to discern potential differences in their isotopic signatures. In contrast, in‐situ boron isotope studies (δ 11 B) allow to characterize each serpentine generation, providing insight into their origin and potential fluid mixing (Martin et al., 2015, 2016, 2020, 2023). Boron, a highly fluid‐mobile element (FME), with its two isotopes ( 10 B and 11 B) that have a large relative mass difference, is predicted to fractionate easily as a function of temperature, pH, phase partitioning, and potentially depth (Martin et al., 2020; Wunder et al., 2005).…”