A volcanic province near the western termination of the Charlie-Gibbs Fracture Zone at the rifted margin, offshore northeast Newfoundland

Keen, C. E.; Dafoe, Lynn T.; Dickie, K

doi:10.1002/2014tc003547

Cited by 23 publications

(22 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This period coincides with the start of movement along the Charlie Gibbs fracture zone (Figure a), which separates the oceanic domain between Orphan and Porcupine Bank and the ongoing rift system between the northeastern Newfoundland margin and Rockall Bank. This fracture zone created a narrow transform margin between southern Rockall Trough and the West Orphan Basin with significant magmatism present on both sides (Keen et al, ). The Labrador rift system began its activity and accommodated the slow extension between Eurasia, North America, and Greenland, which was part of Eurasia at this stage.…”

Section: Tectonic Evolution Of the Southern North Atlantic Rift Domainsmentioning

confidence: 99%

Kinematic Evolution of the Southern North Atlantic: Implications for the Formation of Hyperextended Rift Systems

et al. 2018

View full text Add to dashboard Cite

We focus on the southern North Atlantic rifted margins to investigate the partitioning and propagation of deformation in hyperextended rift systems using plate kinematic modeling. The kinematic evolution of this area is well determined by oceanic magnetic anomalies after the Cretaceous normal polarity superchron. However, the rift and early seafloor spreading evolution (200–83 Ma) remains highly disputed due to contentious interpretations of the J magnetic anomaly on the Iberia‐Newfoundland conjugate margins. Recent studies highlight that the J anomaly is probably polygenic, related to polyphased magmatic events, and therefore does not correspond to an isochron. We present a new palinspastic restoration without using the J magnetic anomaly as the chron M0. We combine 3‐D gravity inversion results with local structural, stratigraphic, and geochronological constraints on the rift deformation history. The restoration of the southern North Atlantic itself is not the primary aim of the study but rather is used as a method to investigate the spatiotemporal evolution of hyperextended rift systems. We include continental microblocks that enable the partitioning of the deformation between different rift segments, which is of particular importance for the evolution of the Iberia‐Eurasia plate boundary. Our modeling highlights the following: (1) the segmentation of the Iberia‐Newfoundland rift system during continental crust thinning, (2) the northward V‐shape propagation of mantle exhumation and seafloor spreading, (3) the complex partitioning of deformation along the Iberia‐Eurasia plate boundary, and (4) a three‐plate propagation model which implies transtension.

show abstract

Section: Tectonic Evolution Of the Southern North Atlantic Rift Domainsmentioning

confidence: 99%

Kinematic Evolution of the Southern North Atlantic: Implications for the Formation of Hyperextended Rift Systems

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Despite the research focus on the margins of the southern North Atlantic, the mechanisms driving extensional deformation in the continental domains leading to the creation of new oceanic crust, and thus passive margins, remains a topic of considerable current research interest (Nirrengarten et al, 2018;Gouiza and Paton, 2019). Current areas of research in this area include, but are not limited to: 1) timing of spatially and temporally overlapping and interacting rifting events (Gouiza et al, 2015), 2) sediment distribution, provenance and facies (Tyrrell et al, 2007), 3) timing of structural development and its relationship with hydrocarbon prospectivity (Enachescu et al, 2004), 4) the role of pre-existing structures in controlling rift evolution and margin architecture (Doré et al, 1999), and 5) the causes and consequences of rift-and breakup-related magmatism (Keen et al, 2014;Peace et al, 2018c).…”

Section: Geological Settingmentioning

confidence: 99%

“…1) The preservation of relatively undeformed continental fragments (e.g., the Flemish Cap ( Figure 1) - Sibuet et al, 2007a;Peron-Pinvidic et al, 2010) 2) Formation of transform systems and also oblique rifts (e.g., the Charlie-Gibbs Fracture Zone (Figure 1) - Olivet et al, 1974) 3) Triple junctions (with both rift and spreading-axes) (e.g., the Bay of Biscay ( Figure 1) - Sibuet and Collette, 1991) 4) Multiple failed rift axes (e.g., the Rockall Basin (Figure 1) - Roberts et al, 2018) 5) Post-breakup processes such as magmatism (Keen et al, 2014;Peace et al, 2017) 6) Localised subduction (Duarte et al, 2013) and 7) Ambiguity in the interpretation of geoscience data on conjugate margins. For example, different interpretations of the earliest oceanic crust age (Hosseinpour et al, 2013).…”

Section: Possible Complicating Features In Conjugate Margin Studiesmentioning

confidence: 99%

Conjugate margins — An oversimplification of the complex southern North Atlantic rift and spreading system?

Peace

Welford

2020

Interpretation

View full text Add to dashboard Cite

The prevalence of conjugate margin terminology and studies in the scientific literature is testimony to the contribution that this concept and approach has made to the study of passive margins, and more broadly extensional tectonics. However, when applied to the complex rift, transform, and spreading system of the southern North Atlantic (i.e., the passive margins of Newfoundland, Labrador, Ireland, Iberia, and southern Greenland), it becomes obvious that at these passive continental margin settings, additional geologic phenomena complicate this convenient description. These aspects include (1) the preservation of relatively undeformed continental fragments, (2) formation of transform systems and oblique rifts, (3) triple junctions (with rift and spreading axes), (4) multiple failed rift axes, (5) postbreakup processes such as magmatism, (6) localized subduction, and (7) ambiguity in identification of oceanic isochrons. Comparison of two different published reconstructions of the region indicates the ambiguity in conducting conjugate margin studies. This demonstrates the need for a more pragmatic approach to the study of continental passive margin settings where a greater emphasis is placed on the inclusion of these possibly complicating features in palinspastic reconstructions, plate tectonics, and evolutionary models.

show abstract

“…CGFZ = Charlie‐Gibbs Fracture Zone, GB = Grand Banks, NB = Newfoundland Basin, NF = island of Newfoundland, NL = Newfoundland and Labrador, NS = Nova Scotia. ‘Northern Boundary’ is the northern boundary of Orphan Basin (Keen et al ., ). The western edge of Orphan Basin and the outline of the Jeanne d'Arc Basin are after Edwards et al .…”

Section: Introductionmentioning

confidence: 97%

Regional stratigraphy and subsidence of Orphan Basin near the time of breakup and implications for rifting processes

et al. 2015

View full text Add to dashboard Cite

The stratigraphic, subsidence and structural history of Orphan Basin, offshore the island of Newfoundland, Canada, is described from well data and tied to a regional seismic grid. This large (400 by 400 km) rifted basin is part of the non-volcanic rifted margin in the northwest Atlantic Ocean, which had a long and complex rift history spanning Middle Jurassic to Aptian time. The basin is underlain by variably thinned continental crust, locally <10-km thick. Our work highlights the complex structure, with major upper crustal faults terminating in the mid-crust, while lower crustal reflectivity suggests ductile flow, perhaps accommodating depth-dependent extension. We describe three major stratigraphic horizons connected to breakup and the early post-rift. An Aptian-Albian unconformity appears to mark the end of crustal rifting in the basin, and a second, more subdued Santonian unconformity was also noted atop basement highs and along the proximal margins of the basin. Only minor thermal subsidence occurred between development of these two horizons. The main phase of postrift subsidence was delayed until post-Santonian time, with rapid subsidence culminating in the development of a major flooding surface in base Tertiary time. Conventional models of rifting events predict significant basin thermal subsidence immediately following continental lithospheric breakup. In the Orphan Basin, however, this subsidence was delayed for about 25-30 Myr and requires more thinning of the mantle lithosphere than the crust. Models of the subsidence history suggest that extreme thinning of the lithospheric mantle continued well into the post-rift period. This is consistent with edge-driven, small-scale convective flow in the mantle, which may thin the lithosphere from below. A hot spot may also have been present below the region in Aptian-Albian time.

show abstract

A volcanic province near the western termination of the Charlie-Gibbs Fracture Zone at the rifted margin, offshore northeast Newfoundland

Abstract: A mid-Cretaceous to Late Cretaceous volcanic province, named here the Charlie-Gibbs Volcanic

Cited by 23 publications

References 58 publications

Kinematic Evolution of the Southern North Atlantic: Implications for the Formation of Hyperextended Rift Systems

Kinematic Evolution of the Southern North Atlantic: Implications for the Formation of Hyperextended Rift Systems

Conjugate margins — An oversimplification of the complex southern North Atlantic rift and spreading system?

Regional stratigraphy and subsidence of Orphan Basin near the time of breakup and implications for rifting processes

Contact Info

Product

Resources

About