Saglek Basin in the Labrador Sea, east coast Canada; stratigraphy, structure and petroleum systems

Jauer, C D; Oakey, G N; Williams, Graham L.; Wielens, J B W

doi:10.2113/gscpgbull.62.4.232

Cited by 12 publications

(4 citation statements)

References 52 publications

(36 reference statements)

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“…North Atlantic passive margins contain multiple rift basins that have attracted considerable petroleum exploration and production interest (Enachescu, 2006;Jauer et al, 2014;Alves et al, 2014;Scotchman et al, 2018;Schofield et al, 2018;Shannon, 2018), and thus it is of utmost importance that accurate plate reconstructions are produced with exploration in mind if they are to be useful in this aspect (Ady and Whittaker, 2018). In this study several of these marginal rift basins are focused on principally the Orphan Basin, offshore Newfoundland, Canada, and the Rockall and Porcupine basins, offshore the UK and Ireland, the development of which are detailed in numerous previous works and as such only the most salient points are provided below.…”

Section: Geological Setting: the Southern North Atlanticmentioning

confidence: 99%

Deformable plate tectonic models of the southern North Atlantic

Peace

Welford

Ball

et al. 2019

Journal of Geodynamics

144

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Section: Geological Setting: the Southern North Atlanticmentioning

confidence: 99%

Deformable plate tectonic models of the southern North Atlantic

Peace

Welford

Ball

et al. 2019

Journal of Geodynamics

144

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“…It could also be the consequence of strain migration associated with hyperextension (Brune et al 2014) and, in the southern Baffin Bay, to the usual development of VPMs away from previous amagmatic rift systems due to strain hardening (Guan et al 2019). Major shear zones, faults and basement structures onshore ( Figure 10) may have controlled the fracture zones, structural divisions and basin architecture offshore (Welford and Hall 2013;Jauer et al 2014;Peace et al 2018b).…”

Section: Additionally Neoproterozoic and Palaeoproterozoic Dyke Swarmentioning

confidence: 99%

Structural inheritance in the North Atlantic

Schiffer

Doré²,

Foulger

et al. 2020

Earth-Science Reviews

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The North Atlantic, extending from the Charlie Gibbs Fracture Zone to the north Norway-Greenland-Svalbard margins, is regarded as both a classic case of structural inheritance and an exemplar for the Wilson-cycle concept. This paper examines different aspects of structural inheritance in the Circum-North Atlantic region: 1) as a function of rejuvenation from lithospheric to crustal scales, and 2) in terms of sequential rifting and opening of the ocean and its margins, including a series of failed rift systems. We summarise and evaluate the role of fundamental lithospheric structures such as mantle fabric and composition, lower crustal inhomogeneities, orogenic belts, and major strike-slip faults during breakup. We relate these to the development and shaping of the NE Atlantic rifted margins, localisation of magmatism, and microcontinent release. We show that, although inheritance is common on multiple scales, the Wilson Cycle is at best an imperfect model for the Circum-North Atlantic region. Observations from the NE Atlantic suggest depth dependency in inheritance (surface, crust, mantle) with selective rejuvenation depending on timescales , stress field orientations and thermal regime. Specifically, post-Caledonian reactivation to form the North Atlantic rift systems essentially followed pre-existing orogenic crustal structures, while eventual breakup reflected a change in stress field and exploitation of a deeper-seated, lithospheric-scale shear fabrics. We infer that, although collapse of an orogenic belt and eventual transition to a new ocean does occur, it is by no means inevitable.

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“…1A). Both the Saglek and Hopedale Basins contain synrift and postrift, clastic dominated sequences of Cretaceous to Pleistocene age (Jauer et al, 2014). Exposures of Mesozoic and Cenozoic sediments onshore along the Labrador coast are extremely rare (Haggart, 2014).…”

Section: Geological Settingmentioning

confidence: 99%

“…Under a simple shear rifting regime the upper plate margin would be southwest Greenland and the lower plate margin would be Labrador, according to the distinction between the margin types in the origi nal model by Lister et al (1986). The asymmetry documented between these margins may have implications for petroleum exploration in the Labrador Sea (e.g., Jauer et al, 2014;Jauer and Budkewitsch, 2010). Such implications in clude the deeper, potentially more prospective basins on the Labrador margin and the inevitable asymmetry in the heat flow due to the asymmetric mag matic distribution, which may potentially influence the maturation of source material (Peace et al, 2015).…”

Section: Melt Volumementioning

confidence: 99%

An evaluation of Mesozoic rift-related magmatism on the margins of the Labrador Sea: Implications for rifting and passive margin asymmetry

et al. 2016

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The Labrador Sea is a small (~900 km wide) ocean basin separating southwest Greenland from Labrador, Canada. It opened following a series of rifting events that began as early as the Late Triassic or Jurassic, culminating in a brief period of seafloor spreading commencing by polarity chron 27 (C27; Danian) and ending by C13 (Eocene-Oligocene boundary). Rift-related magmatism has been documented on both conjugate margins of the Labrador Sea. In southwest Greenland this magmatism formed a major coast-parallel dike swarm as well as other smaller dikes and intrusions. Evidence for rift-related magmatism on the conjugate Labrador margin is limited to igneous lithologies found in deep offshore exploration wells, mostly belonging to the Alexis Formation, along with a postulated Early Cretaceous nephelinite dike swarm (ca. 142 Ma) that crops out onshore, near Makkovik, Labrador. Our field observations of this Early Cretaceous nephelinite suite lead us to conclude that the early rift-related magmatism exposed around Makkovik is volumetrically and spatially limited compared to the contemporaneous magmatism on the conjugate southwest Greenland margin. This asymmetry in the spatial extent of the exposed onshore magmatism is consistent with other observations of asymmetry between the conjugate margins of the Labrador Sea, including the total sediment thickness in offshore basins, the crustal structure, and the bathymetric profile of the shelf width. We propose that the magmatic and structural asymmetry observed between these two conjugate margins is consistent with an early rifting phase dominated by simple shear rather than pure shear deformation. In such a setting Labrador would be the lower plate margin to the southwest Greenland upper plate.

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Saglek Basin in the Labrador Sea, east coast Canada; stratigraphy, structure and petroleum systems

Cited by 12 publications

References 52 publications

Deformable plate tectonic models of the southern North Atlantic

Deformable plate tectonic models of the southern North Atlantic

Structural inheritance in the North Atlantic

An evaluation of Mesozoic rift-related magmatism on the margins of the Labrador Sea: Implications for rifting and passive margin asymmetry

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