Slab Rollback and Backarc Spreading

Slab Rollback and Backarc Spreading - John Seach

Slab rollback is a geologic term which refers to the process where a sinking tectonic slab
subducts at a steep angle and sweeps back through the mantle like a paddle.
This causes the hinge to migrate away from the arc region. The upper plate is pulled along
in the process and may lead to backarc spreading.