Fig. 4: Schematic diagram of the interpreted structure and mechanisms of emplacement.
From: Channelized metasomatism in Archean cratonic roots as a mechanism of lithospheric refertilization
a A ca. 1.9 Ga mantle plume impinges along the thickened, depleted lithosphere which comprises the northern cratonic core and is deflected southward. Pooling of melts at the base of the LAB results in gradual percolation of metasomatic fluids into the lithosphere forming phlogopite, possibly channeled into N-S weak zones which formed as a result of E-W compression during the Trans-Hudson Orogen. b Subsequent melting and magmatism related to the ca. 1.1 Ga mid-continent rift (MCR) overprints the phlogopite within the N-S channels and refertilizing the surrounding lithosphere.
