Structure and Development of Porcupine Seabight Sedimentary Basin, Offshore Southwest Ireland

Masson, P.

doi:10.1306/94885949-1704-11d7-8645000102c1865d

Cited by 5 publications

(8 citation statements)

References 19 publications

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“…Many of these faults accommodated Upper Jurassic syn-rift sedimentation within half-graben depocentres (Jones & Underhill, 2011;Robinson & Canham, 2001). Masson and Miles (1987) suggested that the variation in structural trends may have resulted from two rift events whereby an initial phase formed N-S trends followed by a second phase dominated by NW-SE trends. In contrast, Makris et al (1988) proposed an initial phase that resulted in N-S to NNE-SSW faults followed by a second phase dominated by N-S trends.…”

Section: Whiting Et Almentioning

confidence: 99%

From rifting to hyperextension: Upper Jurassic–Lower Cretaceous tectono‐stratigraphy of the Porcupine Basin, Irish Atlantic Margin

2021

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Hyperextended basins are increasingly recognized along the outboard parts of continental margins as aborted basins created during continental break-up. Many of the concepts for understanding and modelling basin evolution and fill were developed for regions that have undergone modest crustal stretching (β < 2) and may not be valid in basins where the crust and upper mantle are heavily modified by extreme stretching. The present study uses extensive 2D and 3D seismic and well data to analyse the Late Jurassic-Cretaceous tectono-stratigraphic evolution of the Porcupine Basin, bracketing the timing of hyperextension. It is an instructive basin, offshore west of Ireland, preserving low-magnitude strain in the north, with increasing degrees of hyperextension in the south. Detailed mapping of strain domains (proximal, necking and hyperextended) across the Porcupine Basin reveals five main rift segments, each with a distinctive geometry and strain history. During early low-strain rifting, inherited crustal structures strongly influenced the rift architecture by controlling the location and geometry of fault-controlled marine depocentres. The transition from hyperextension to post-rift subsidence was marked by locally developed, unconformity-bounded, marine sequences that draped the underlying rift topography. Whilst these 'transition sequences' are dated as Tithonian above the necking domain, similar but younger Early Cretaceous transition packages developed in the hyperextended domain, suggesting extension migrated towards the rift axis during hyperextension. Early post-rift sequences were broadly distributed across the rift centre and basin flanks before strong, thermally-controlled subsidence of the hyperextended crust, along with hinging of the necking domain, locally to the point of slope failure, gave rise to axially-focused marine deposition. Hyperextension may have left the basin susceptible to intra-plate stress changes accounting for several unconformities within the post-rift fill. This study provides an improved basin-wide understanding of the tectono-stratigraphic evolution of hyperextended basins.

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Section: Whiting Et Almentioning

confidence: 99%

From rifting to hyperextension: Upper Jurassic–Lower Cretaceous tectono‐stratigraphy of the Porcupine Basin, Irish Atlantic Margin

2021

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“…In the north, ENE-WSW trending wrench faults (Dancer et al, 1999;Tate, 1993) separate the Porcupine Basin from the Slyne Basin (Figure 1; Jones et al, 2004) and to the southwest it merges into the Porcupine Abyssal Plain (Figure 1). The basin is interpreted as a failed rift of the proto-North Atlantic (Croker & Klemperer, 1989;Masson & Miles, 1986;Péron-Pinvidic & Manatschal, 2010). It has a symmetrical profile, with large-scale rotated fault blocks of pre-and syn-rift strata overlain by a thick postrift Cretaceous-Cenozoic succession giving a 'steer's head' F I G U R E 2 A regional geoseismic profile (modified after PAD, 2006) across the northern part of the Porcupine Basin showing the major structures, mega-sequences and key seismic horizons.…”

Section: Geological Settings and Basin Evolutionmentioning

confidence: 99%

“…Structural inheritance is believed to have played an important role in the development of NW Europe (Coward, 1990;Doré et al, 1997). A network of NE-SW trending 'transform' faults have been identified from gravity and magnetic data (Lefort & Max, 1984;Masson & Miles, 1986), with the Upper Jurassic basin-bounding normal faults apparently stepping across these 'transform' structures (Masson & Miles, 1986) which appear to link to major onshore faults (Figure 1). Some authors have described WNW-ESE and NW-SE trending faults that separate areas of different crustal rheology and thickness (Johnson et al, 2001;Readman et al, 2005;Tate, 1993).…”

Section: Geological Settings and Basin Evolutionmentioning

confidence: 99%

“…Some authors have described WNW-ESE and NW-SE trending faults that separate areas of different crustal rheology and thickness (Johnson et al, 2001;Readman et al, 2005;Tate, 1993). These inherited structures may have been reactivated on more than one occasion during the basin evolution (Lefort & Max, 1984;Masson & Miles, 1986).…”

Section: Geological Settings and Basin Evolutionmentioning

confidence: 99%

“…. Pre-Jurassic events of limited crustal extension that have been proposed to have affected the basin during Permian to earliest Jurassic (Croker & Klemperer, 1989;Croker & Shannon, 1987;Doré et al, 1999;Masson & Miles, 1986;McCann et al, 1995a;Naylor & Anstey, 1987;Shannon, 1991;Tate, 1993;Tate et al, 1993) are poorly resolved from seismic reflection data. Mid-Late Jurassic fault blocks and growth strata resulting from NW-SE-oriented rifting are documented from seismic and well data (Croker & Shannon, 1987;Masson & Miles, 1986;Naylor & Anstey, 1987;Shannon et al, 1995;Tate & Dobson, 1988;Tate et al, 1993;Williams et al, 1999).…”

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confidence: 99%

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