Major and trace elements in igneous and metamorphic rocks are commonly used to infer their petrogenesis (e.g., Carmichael et al. 1974; Wilson 1989; Pearce and Parkinson 1993). To date, our understanding of element transport is informed by diffusion data (e.g., Zhang 2010; Spandler and O’Neill 2010) and partitioning measurements that quantify the fractionation of an element between a mineral and a melt, aqueous fluid or metal phase (e.g., Beattie et al. 1993; Pearce and Parkinson 1993; Schott et al. 2009; Rollinson 2014). However, there is a dearth of data on the...

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