From orogenic collapse to rifting: A case study of the northern Porcupine Basin, offshore Ireland

Abstract

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Lithospheric Strength and Rift Migration Controls on Synrift Stratigraphy and Breakup Unconformities at Rifted Margins: Examples From Numerical Models, the Atlantic and South China Sea Margins

“…The Porcupine basin is a V‐shaped failed rift located in the North Atlantic, located 200 km southwest of Ireland (Figure 12; Bullois et al, 2018; Chen et al, 2018). The basin underwent significant lithospheric stretching in Mid‐Late Jurassic times, with less pronounced rifting in the Permo‐Triassic and Early Cretaceous (Chen et al, 2018; Tate et al, 1993).…”

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

“…Detailed mapping of the strain domains and the associated tectono-stratigraphy is critical for determining the temporal and spatial evolution of the basin and to identify how the variable strain was accommodated. As the basin obliquely transects a number of pre-rift crustal terranes that extend westwards from onshore Ireland (Figure 2b) (Bulois et al, 2018;Štolfová & Shannon, 2009), the role of structural inheritance during the progression from initial rifting through to hyperextension can be analysed, and critically the extent to which inheritance persists during the process.…”

“…The Porcupine Basin is noticeably oblique to Caledonian and Variscan structural trends present onshore Ireland (Shannon, 1991). Several major onshore structures, including the Iapetus Suture and Variscan Front, have been proposed to cross the basin but their precise position and expression is poorly constrained (Bulois et al, 2018;Chew & Stillman, 2009;Shannon, 1991;Štolfová & Shannon, 2009). Major pre-rift structures have been suggested to be important for forming rift-segmenting transfer faults during rifting (Nirrengarten et al, 2017;Thinon, 1999;Tugend et al, 2014Tugend et al, , 2015 and the presence of such structures in the Porcupine Basin could offer new insights into their role in basin development.…”

“…Prior to the main phase of extension, sequence UJ0 was deposited during the Oxfordian either due to continued thermal subsidence following Carboniferous and Triassic extension with intervening Variscan compression (Bulois et al, 2018;Štolfová & Shannon, 2009;Tate, 1992) or broad subsidence associated with an onset warp phase (Sinclair et al, 1994), EAGE WHITING eT al.…”

“…(a) Palaeogeographical reconstruction of the proto‐North Atlantic Ocean during the Valanginian – Barremian (constructed from the following work: Abdelmalak et al., 2017; Bulois et al., 2018; Chew & Stillman, 2009; Cunningham & Shannon, 1997; Doré et al., 1997; Murphy et al., 2016; Piercey et al., 2014; Shannon, 1991; Štolfová & Shannon, 2009; Tugend et al., 2014; Van Staal & Barr, 2012; Welford et al., 2012). (b) Gross depositional environment (GDE) map for the Porcupine Basin during the Valanginian – Barremian.…”