Multi-stage Melt Impregnation and Magma–seawater Interaction in a Slow-Spreading Oceanic Lithosphere: Constraints from Cumulates in the Lagkorco Ophiolite (central Tibet)

Although seismic and hydrothermal data show evidence of magma–seawater interaction in slow spreading-rate ridges, such a process has been rarely observed in situ in lower oceanic crust. In this study, we reported petrological and mineral data on the plutonic rocks from the lower oceanic crust of the Lagkorco ophiolite from central Tibet, which shows geological and petrological features indicative of a slow-spreading ridge origin. Both troctolites and gabbros were derived from depleted magmas containing 0.5–1.0 wt.