Fig. 4: Schematic model illustrating the recycling of peridotite fragments from the MTZ of the eastern Asia BMW.
From: Iron disproportionation in peridotite fragments from the mantle transition zone
Na-rich majoritic garnets, originating from the subducting Pacific slab, had metallic iron inclusions formed by iron disproportionation under low oxygen fugacity conditions during the stagnation of the Pacific slab in the MTZ. Subsequently, these garnets were entrained by ascending surrounding mantle predominantly composed of wadsleyite/Ringwoodite (Wds/Rwd), and transported to the surface of South China Craton as peridotite fragments by Cenozoic basaltic magma. The P-wave seismic image is adapted from Wei et al.25. SC craton: South China craton; PHS plate: Philippine Sea plate.
