PORCUPINE STUDIES GROUP HATTON BANK HATTON TROUGH ROCKALL BANK EDORAS BANK ROCKALL TROUGH PORCUPINE BANK PORCUPINE SEABIGHT CELTIC SHELF PORCUPINE STUDIES GROUP THE TECTONIC EVOLUTION OF THE PORCUPINE BASIN: PROJECT P00/8 M.G. NORTON SEPTEMBER 2002 Porcupine Abyssal Plain GOBAN SPUR

THE TECTONIC EVOLUTION OF THE PORCUPINE BASIN: PROJECT P00/8 PORCUPINE BANK Porcupine Abyssal Plain GOBAN SPUR PORCUPINE SEABIGHT M.G. NORTON SEPTEMBER 2002 THE TECTONIC EVOLUTION OF THE PORCUPINE BASIN: PROJECT P00/8 PORCUPINE STUDIES GROUP PORCUPINE BANK Porcupine Abyssal Plain GOBAN SPUR PORCUPINE SEABIGHT M.G. NORTON SEPTEMBER 2002 THE TECTONIC EVOLUTION OF THE PORCUPINE BASIN: PROJECT P00/8 PORCUPINE STUDIES GROUP PORCUPINE BANK Porcupine Abyssal Plain GOBAN SPUR PORCUPINE SEABIGHT M.G. NORTON SEPTEMBER 2002 THE TECTONIC EVOLUTION OF THE PORCUPINE BASIN: PROJECT P00/8 PORCUPINE STUDIES GROUP PORCUPINE BANK Porcupine Abyssal Plain GOBAN SPUR PORCUPINE SEABIGHT M.G. NORTON SEPTEMBER 2002 THE TECTONIC EVOLUTION OF THE PORCUPINE BASIN: PROJECT P00/8 PORCUPINE STUDIES GROUP PORCUPINE BANK Porcupine Abyssal Plain GOBAN SPUR PORCUPINE SEABIGHT M.G. NORTON SEPTEMBER 2002 THE TECTONIC EVOLUTION OF THE PORCUPINE BASIN: PROJECT P00/8 PORCUPINE STUDIES GROUP PORCUPINE BANK Porcupine Abyssal Plain GOBAN SPUR PORCUPINE SEABIGHT M.G. NORTON SEPTEMBER 2002 THE TECTONIC EVOLUTION OF THE PORCUPINE BASIN: PROJECT P00/8 PORCUPINE STUDIES GROUP

22° 20° 18° 16° 14° 12° 10° 8° 6° ROCKALL BANK HATTON BANK ROCKALL TROUGH HATTON TROUGH EDORAS BANK PORCUPINE BANK PORCUPINE SEABIGHT Porcupine Abyssal Plain CELTIC SHELF GOBAN SPUR 58° 56° 54° 52° 50° 48° Figure 1.2 Bathymetry of the Atlantic Margin West of Ireland 100 km

Figure 1.3 Porcupine –Goban Margin Structural Elements from Naylor et al. (2002) Enclosure 1

13° 12° 11° 5900000 Figure 1.4 Seismic and well database used in Project P00/8 52° 36 35 Extent of 3D Dataset 5800000 51° 44 45 5700000 50° 53 54 5600000 600000 700000 800000 UTM zone 28 Central Meridian 15°W

Figure 2.2 Plate Tectonic reconstruction at 210 Ma (Late Triassic) from Johnston et al. 2001. (Abbreviations for lineaments and fracture zones: AGFZ Azores Fracture Zone, Ap Appalachian Front, BBFZ Bay of Biscay Fracture Zone, Ca Caledonian Front, Co Collector, Dov Dover, FCL Fair Head-Clew Bay Line, G Gander, GGF Great Glen Fault, H Hercynian Front, HBF Highland Boundary Fault, M Moine Thrust, N Nazare Line, SA South Amorican, SAFZ South Atlas Fracture Zone, SUF Southern Uplands Fault, Ta Tagus Lineament.

Figure 2.5 Axial traces of anticlines from fault bend and fault propagation folds, NW Quad 45 10 km

Upper Cretaceous Isochron (ms) Figure 2.27 Upper Cretaceous Isochron (ms) North Porcupine Basin 5900000 40 140 240 340 440 Finnian’s Spur 5850000 5800000 5750000 5700000 5650000 5600000 600000 650000 700000 750000

? ROCKALL BASIN PORCUPINE BASIN TERTIARY CRETACEOUS JURASSIC TRIAS PERM CARB DEV SIL EOCENE PALAEOCENE APTO-ALBIAN RYAZANIAN-BARREMIAN UPPER MIDDLE LOWER ROCKALL BASIN PORCUPINE BASIN VARISCAN OROGENY CALEDONIAN OROGENY BREAK-UP OF PANGAEA N. ATLANTIC OPENING BISCAY OPENS ? N.PORCUPINE ONLY EVENTS PERIOD KEY Extension Compression Uplift Vulcanism Figure 2.34 Comparison between the tectonic development of the Porcupine & Irish Rockall Basins

Lower Cretaceous Isochron (ms) Figure 3.13 Lower Cretaceous Isochron (ms) 5900000 100 800 1500 2200 2900 5850000 5800000 5750000 5700000 5650000 5600000 600000 650000 700000 750000

(after Davies and Kusznir, in press) crustal Figure 3.14

North Moling Sub-basin South Moling Sub-basin 34 35 36 43 44 45 25 26 27 Figure 4.1 Porcupine Basin Main Late Jurassic Rift Faults at Base Cretaceous KEY Fault at Base Cretaceous Transfer zone Well Late Jurassic depocentre Late Jurassic and Early Cretaceous depocentre North Porcupine Basin North Moling Sub-basin South Moling Sub-basin Finnian’s Spur 20 km

Contoured time map (ms) on the top of the Median Volcanic Ridge 660000 680000 700000 720000 5740000 4600 5050 5500 5950 6400 5720000 5700000 5680000 5660000 Figure 4.12 Contoured time map (ms) on the top of the Median Volcanic Ridge

Figure 4.16 Alternative locations for the Clare Lineament from published papers 82 75 25 26 27 83 74 34 35 36 Gravity High 84 73 43 44 45 Johnson et al. (2001) Tate (1992) 72 52 53 54 McGrane et al. (2001) Continent-Ocean Boundary Naylor et al. (2002) (unnamed lineament)