Montages of seismic-reflection profiles comprise geoseismic
panel 7, panel 8
and panel 9 from the Rockall–Porcupine region. The relative locations of these profiles are shown on the map opposite. The map also shows the location of profiles illustrated in
Fig. 10, which together with these panels provide a comprehensive regional overview of the seismic expression of the Neogene succession in this region.
Geoseismic panel 7 shows multichannel and high-resolution seismic profiles from the northern Rockall Trough, between Rosemary Bank and the Wyville-Thomson Ridge. The profiles on this panel illustrate the variable development of the Neogene sediments largely in response to intense bottom-current activity. Sediment drifts and sediment waves are developed in the basin, whereas extensive erosion has occurred around the northern margin of the Rockall Trough.
Profile 7a & Profile
7b also show the effects of neotectonic doming associated with an inversion anticline in the NW Rockall Trough.
Geoseismic panel 8 shows high-resolution seismic profiles and associated interpreted line drawings, which depict the character of the Neogene strata on the flanks of the Rockall Trough.
Profile 8a & Profile
8b illustrate upslope accretion of sediment drifts on the western flank of the central Rockall Trough. These profiles not only highlight the importance of sediment drifts in shelf-margin construction, but also show the destructive effects of bottom-current erosion.
Profile 8c is from the upper Hebrides Slope and images a sediment record influenced by both downslope and alongslope currents. This section was tested by the key BGS borehole 88/7, 7A (cf.
Fig. 20 and Fig.
Geoseismic panel 9 shows multichannel and high-resolution seismic profiles from the southern Rockall Trough, including the giant elongate Feni Ridge sediment drift.
Profile 9a & Profile
9b complement the transect shown in
Fig. 10d, and provide a greater context for the Neogene succession in relation to the underlying Palaeogene and older strata.
Profile 9c & Profile
9d are from the SW end of the Rockall Trough in the vicinity of DSDP site 610, which is the key site for the dating of the C20 reflective zone.
More specific details of the Neogene succession highlighted by these seismic profiles are presented separately with each panel.