Abstract
The Three Kings Ridge has been reinterpreted as a west-facing island arc under which a significant amount of Norfolk Basin lithosphere may have been subducted. Examination of additional seismic reflection profiles adds credence to this interpretation and suggests the presence of a north-south transition from subduction under the northern half of the ridge, evidenced by well-preserved island-arc morphology, to obduction along the southern half of the ridge. This obduction probably obliterated the trench, resulting in overthrusting and severe deformation of the forearc basin as well as intense faulting of the volcanic arc.
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