Fróðskaparrit - 01.01.1996, Page 122

TWO-WAY TRAVEL TIME (sec)
126 IMAGING of basalt and underlying structures in the faroese offshore area
Figure 6. Profile 4, located to the north ofFugloy Ridge immediately inlandfrom the Oceanward Dipping
Reflector Sequence. The overlying Miocene and Oligocene units are particularly uniform.
2. Conversely, the underlying Subbasalt 3 (dark pink)
unit thickens appreciably over the high, indicating
that uplift and erosion took place between Subbasalt
1 and 2 rather than in earlier times, probably during
a reactivation event.
3. The yellow Subbasalt 4 interval is substantially
faulted and these faults appear to control the struc-
ture of the East Faroe High.
Profile 3 (Figs. 1 and 5) lies in the Faroe
Bank Channel Basin, to the west of the
Munkagrunnur Ridge. Again, the regional-
ly interpreted stfucture is apparent and the
following additional observations can be
made:
1. The interpreted orange basalt unit is thicker than that
found to the east of the Munkagrunnur Ridge (see
figs. 3 and 4). This increased thickness is prevalent
throughout the entire basin.
2. The interpretation of Subbasalt l is more difficult in
this basin, due to the similarity in character with that
of the plane-parallel bedded basalt. However, Sub-
basalt 1 is even more strongly bedded and still dis-
plays onlap, downlap, and infill with the underlying
Subbasalt 2 so we believe that the intepretation,
again, of a pre-basalt unit still holds.
3. The interpretation of Subbasalt 4 is, in this basin,
highly tentative and proceeded primarily on charac-
ter differences, as the difference in reflection
strength is small and processing artefacts are strong.
We interpret this horizon boundary as tentatively
representative of basin form.
Profile 4 (Figs. 1 and 6) lies in a quite
different environment to the north and east
of the Faroe Islands and Platform, immedi-
ately southwards of the Oceanward Dip-
ping Reflector (ODR) sequence, which is
thought to be representative of the conti-
nent-ocean transition (Spence et al, 1989;
Roberts, Morgan, and Backman, 1984).
Other than the Miocene, Oligocene, and
yellow Subbasalt 4 units, it is not possible
to correlate from this north side of the Fu-
gloy Ridge across the Platform to the
Faroe-Shetland Channel.