Fig. 3From: Coupled onshore erosion and offshore sediment loading as causes of lower crust flow on the margins of South China SeaCartoon showing the flow of the ductile lower crust during active extension and the onset of seafloor spreading. The lower crust is preferentially thinned towards the continent–ocean boundary. Arrows show flow away from the continent-ocean boundary, while cross marks show flow into the section, parallel to the riftBack to article page