Seismic refraction profiles parallel to and across an inferred Precambrian rift zone. 3-km thick low-velocity layer which probably consists of late Precambrian clastics. Tectonic model includes a late Precambrian mantle plume that intruded the lower crust of the northern embayment, causing uplift (and/or crustal stretching) and subsequent rifting of the axial area. This was followed by erosion, subsidence, and subsequent deposition of sediments in the resulting trough.--Modified journal abstract.

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