The Age and Origin of the Deepest Correlative Structures Recognized off Canada and Europe

LEFORT, JEAN-PIERRE; HAWORTH, RICHARD T.

doi:10.1016/b978-0-444-41851-7.50011-x

Cited by 3 publications

(3 citation statements)

References 21 publications

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“…Remarked dated magmatic bodies (white large circles) are intrusive and pre‐120 Ma (Nirrengarten et al., 2017). Regional magnetic trends (positive TMA) from Lefort and Haworth (1979) and Martínez Catalán (2011)…”

Section: Discussionmentioning

confidence: 99%

“…Palaeozoic orogenic inheritance shows NE‐SW trends, which are prominent on Newfoundland. Offshore Newfoundland, arcuate magnetic patterns (Lefort & Haworth, 1979) and NE‐SW trending structures (Edel et al, 2018) have been identified on magnetic anomaly map. In Iberia, this orientation is represented by some NNE‐SSW fault zones inherited from Variscan Orogeny (i.e.…”

Section: Geological Contextmentioning

confidence: 99%

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Magnetic characterization of the zigzag shaped J‐anomaly: Implications for kinematics and breakup processes at the Iberia–Newfoundland margins

et al. 2020

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Lithospheric breakup is generally defined as the process that results in a new plate boundary and oceanic crust. However, how this process occurs in magma‐poor systems remains debated. As recently suggested, the J‐magnetic anomaly at the Iberia–Newfoundland margins has polygenic sources and therefore cannot be interpreted as an isochron. However, the presence of the J‐anomaly on both margins suggests a common origin. By using analytic signal map of magnetic data, we highlight landward zigzagged limits for the J‐anomalies at the Iberian–Newfoundland margins. The zigzag segments neither match the axis nor the transform systems of previously proposed plate reconstructions, but are aligned with NE‐SW Palaeozoic trends. However, they can be fitted using recently published plate restorations, as expected if they have a single origin. Therefore, a link between the location of syn‐ to post‐breakup magmatic additions along the J‐anomaly and an inherited lithospheric trend is proposed.

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Section: Discussionmentioning

confidence: 99%

Section: Geological Contextmentioning

confidence: 99%

Magnetic characterization of the zigzag shaped J‐anomaly: Implications for kinematics and breakup processes at the Iberia–Newfoundland margins

et al. 2020

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“…This transfer zone, evidenced by bathymetry (as it coincides with the southern border of the SR), and gravity anomaly analysis, is approximately located on the Hercynian deformation front (Figure b), separating two terrains (Avalonia and Gondwana) with distinct rheological behavior (Manatschal et al, ; Martínez Catalán et al, ; Mohn et al, ). With respect to the structural inheritance, the whole Iberia rift system seems to surround the Hercynian core (Bowling & Harry, ; Capdevila & Mougenot, ; Chenin et al, ; Lefort & Haworth, ). Rifting is apparently favored by first‐order “weak” structures corresponding to Hercynian thrust fronts and strike‐slip faults (Figure b) but also possibly conditioned by prerift (Triassic and Late Triassic‐Early Jurassic) strike‐slip faulting (Sopeña et al, ; Vegas et al, ; Ziegler, ).…”

Section: Discussionmentioning

confidence: 99%

Crustal Structure and Continent‐Ocean Boundary Along the Galicia Continental Margin (NW Iberia): Insights From Combined Gravity and Seismic Interpretation

et al. 2018

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The magma-poor rifted continental margin of Galicia has an extremely complex structure. Its formation involved several rifting episodes that occurred ultimately during the early Cretaceous near a ridge triple junction, which produced a change in the orientation of the main structures in its transition to the north Iberia margin. In addition, there is a superimposed partial tectonic inversion along its northwest and northern border which developed from the Late Cretaceous to at least Oligocene times. The present study integrates a large volume of new geophysical information (mainly marine gravity data and 2-D seismic reflection profiles) to provide insights on the formation of this rift system and on the development of its later inversion. The combined interpretation and modeling of this data enable the presentation of a new crustal and structural domain map for the whole Galicia margin. This includes the rift domains related to the extreme thinning of the crust and the lithospheric mantle (stretched, necking, and hyperextension and mantle exhumation domains), as well as a domain of intense compressional deformation. New constraints arise on the origin, the deep structure, and the characterization of the along-and across-strike variation of the continent-ocean transition of the margin, where a progressive change from hyperextension to partial inversion is observed. The development of both rifting and later partial tectonic inversion is influenced by the existence of former first-order tectonic features. Most of the tectonic inversion is focused on the hyperextension and mantle exhumation domain, which in some areas of the northwestern margin is completely overprinted by compressional deformation.

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The Canadian Atlantic Margin: A Passive Continental Margin Encompassing an Active Past

Haworth¹,

Keen²

1979

Developments in Geotectonics

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The Age and Origin of the Deepest Correlative Structures Recognized off Canada and Europe

Cited by 3 publications

References 21 publications

Magnetic characterization of the zigzag shaped J‐anomaly: Implications for kinematics and breakup processes at the Iberia–Newfoundland margins

Magnetic characterization of the zigzag shaped J‐anomaly: Implications for kinematics and breakup processes at the Iberia–Newfoundland margins

Crustal Structure and Continent‐Ocean Boundary Along the Galicia Continental Margin (NW Iberia): Insights From Combined Gravity and Seismic Interpretation

The Canadian Atlantic Margin: A Passive Continental Margin Encompassing an Active Past

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