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Subduction zones are distinctive loci where many pivotal processes take place in a plate tectonic Earth such as the recycling of surface material into the mantle (e.g., Ague & Nicolescu, 2014;Bebout & Penniston-Dorland, 2016), and the creation of new crust that builds continents (e.g., Drummond & Defant, 1990;Foley et al., 2002). Such a slab-mantle interface marks the primary site of physico-chemical exchange and transfer between subducting and overlying plates (Bebout & Penniston-Dorland, 2016). The structure and development of the uppermost levels of a subduction zone are relatively well-known (Cross & Pilger, 1982;Kusky et al., 2020). In contrast, the deeper levels, where crustal and mantle materials have been structurally intercalated and transported during subduction