DOI: 10.1016/j.tecto.2021.228809
论文题名: Investigating the Porcupine Atlantic margin, offshore Ireland, through integration of new seismic reflection and gravity data
作者: Yang P. ; Welford J.K.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 807 语种: 英语
中文关键词: Crustal architecture
; Plate reconstruction
; Seismic data interpretation
; Tectonic evolution
; The Porcupine Atlantic margin
英文关键词: Buildings
; Offshore oil well production
; Seismic waves
; Continental break-up
; Multi-channel seismic
; Oblique extension
; Potential field datum
; Seismic reflections
; Structural fabric
; Structural variations
; Variable geometry
; Seismology
; crustal structure
; data interpretation
; data processing
; deformation mechanism
; integrated approach
; plate convergence
; plate motion
; plate tectonics
; potential field
; seismic data
; tectonic evolution
; tectonic reconstruction
; volcanism
; Atlantic Coast [Europe]
; Atlantic Coast [Ireland]
; Atlantic Ocean
; Ireland
; Porcupine Bank
; Erethizon dorsatum
英文摘要: While the offshore Irish Atlantic margin and related rift basins have been intensively studied for several decades, the Porcupine Bank, straddling between the well-studied Porcupine and Rockall basins, is a poorly understood region due to lacking sufficient geophysical data coverage. In this study, ten newly acquired long-offset multichannel seismic profiles extending across the western Porcupine Bank margin, combined with potential field data, are used to investigate the crustal architecture, tectonic history, and rift-related magmatism along the margin. Significant margin-parallel and margin-perpendicular structural variations are observed and these are used to map the crustal architecture in terms of rifted margin domains. In the transitional zone between continental and oceanic crust, both peridotite ridges with shallow reflective basement and exhumed serpentinized mantle with deeper and smoother basement are interpreted, similar to the conjugate Iberian and Newfoundland margins, as well as further south at the Goban Spur margin. In addition to inferred variations in extension rate during poly-phased rifting episodes, the reactivation of pre-existing inherited Caledonian and Variscan structural fabrics are proposed to have influenced the variable geometries and distributions of the crustal domains along the Porcupine Atlantic margin. Northwestward increasing volcanism and related reflectivity patterns support the transition from magma-poor rifting in the southeast to magma-rich rifting in the northwest. Rigid plate reconstructions of the Irish Atlantic and the Newfoundland margins, particularly involving the Flemish Cap, back to the Early Campanian period, show asymmetric rifting and final continental breakup migrating toward the Porcupine Bank region. This asymmetry is possibly due to oblique extension between the two margins, and/or oblique deformation on the Porcupine Bank side due to its rotation during the opening of the Porcupine Basin. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170932
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Department of Earth Sciences, Memorial University, St. John's, NL, Canada
Recommended Citation:
Yang P.,Welford J.K.. Investigating the Porcupine Atlantic margin, offshore Ireland, through integration of new seismic reflection and gravity data[J]. Tectonophysics,2021-01-01,807