Structure of the collision zone between Bougainville guyot and the accretionary wedge of the New Hebrides island arc, southwest Pacific

Multichannel seismic reflection data show the structure that develops within an island arc-guyot collision zone. The contact zone between the arc and the north and east sides of the guyot is marked by discontinuous antiforms. The extent of collision deformation to the arc and guyot depends in part on the contrast in compressibility and viscosity between these features. We propose that the high-drag, subcircular guyot evolves during collision into a more streamlined shape. We draw an analogy between some features of glacial origin and the subducted part of a guyot. -from Authors