Preprints
https://doi.org/10.5194/egusphere-2023-2524
https://doi.org/10.5194/egusphere-2023-2524
28 Nov 2023
 | 28 Nov 2023
Status: this preprint is open for discussion.

Seismic evaluation of the Flemish Cap and Goban Spur pre-rift relationship prior to the opening of the North Atlantic, with support from plate reconstruction

Pei Yang and J. Kim Welford

Abstract. Recent geophysical investigations of the NE Newfoundland-Irish Atlantic rifted margin pair (North Atlantic) have called into question the previously assumed conjugate relationship and rift-perpendicular extension between the Flemish Cap and Goban Spur. In this study, we present multichannel seismic reflection profiles across the margins of the Flemish Cap, Porcupine Bank, and Goban Spur, and define their structural domains (proximal, necking, hyperextended, and/or exhumed mantle domains), which display varying degrees of asymmetry along strike. Observed intra-crustal reflectivity patterns are interpreted to be related to Paleozoic orogeny and/or orogenic collapse prior to the major Mesozoic rifting, consistent with this rift system having been strongly influenced by inherited Appalachian-Caledonian and Variscan structures. Reflective features within each structural domain are strikingly different across both margins, however similarities are most pronounced for the necking domains of the Porcupine Bank and Flemish Cap, which is consistent with a connection between the Porcupine Bank and Flemish Cap during Early Jurassic rifting. This inference is compatible with recently published deformable plate reconstruction models, which are used herein to relocate and reconstruct the representative seismic sections back through time to the onset of rifting. The changes of paleo-positions and geometric shapes of the seismic sections in deformable plate reconstruction models over time further show complicated 3D plate kinematics for the NE Newfoundland-Porcupine Atlantic margins, highlighting interplay of inherited structures, oblique extension, and poly-phase margin evolution between the Porcupine Bank, Goban Spur, and Flemish Cap and their intervening rift basins during the southern North Atlantic opening.

Pei Yang and J. Kim Welford

Status: open (until 14 Mar 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2524', Frank Zwaan, 08 Feb 2024 reply
Pei Yang and J. Kim Welford
Pei Yang and J. Kim Welford

Viewed

Total article views: 116 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
78 30 8 116 8 4 6
  • HTML: 78
  • PDF: 30
  • XML: 8
  • Total: 116
  • Supplement: 8
  • BibTeX: 4
  • EndNote: 6
Views and downloads (calculated since 28 Nov 2023)
Cumulative views and downloads (calculated since 28 Nov 2023)

Viewed (geographical distribution)

Total article views: 113 (including HTML, PDF, and XML) Thereof 113 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 03 Mar 2024
Download
Short summary
This study challenged previous understanding of the conjugate relationship between the Goban Spur and Flemish Cap, and supports the conjugate relationship between the Porcupine Bank and Flemish Cap instead from a seismic perspective, which is further illustrated in different deformable plate reconstruction models, revealing complex 3D kinematics during the orogenic, orogenic collapse, and oblique extension stages between both margin sides.