This study gives great insights into the formation of sanukitoid magmas using Ti isotopes, but a few things could use more clarification. First, since the study supports a fluid-fluxed eclogite melting model, could the authors explain how temperature changes and pressure-related phase equilibria might have affected Ti isotope fractionation? Since rutile stability is key to this process, were any high-pressure experimental constraints considered to confirm its role under Archean conditions?
Also, the paper compares sanukitoid differentiation trends to modern calc-alkaline suites, but was crustal contamination taken into account? Given that the samples come from different cratonic settings with varying lithospheric compositions, a discussion on how crustal assimilation might have influenced the Ti isotope record would make the interpretations even stronger.