Seaward of the base of the Blake Escarpment, a buried bench forms the top of a seismically incoherent zone. We believe that this bench was formed by erosion of the escarpment during formation of the Au deep-sea unconformity when about 2,000 km3 of material was removed from the face of the escarpment, causing it to retreat as much as 15 km. Undercutting during subsequent events progressively increased the steepness of the escarpment. Thus, we suggest that the Blake Escarpment is not structurally controlled, as has been suggested, but is an erosional feature.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not currently have access to this article.