气候变化领域集成服务门户(CCPortal): Investigating the Porcupine Atlantic margin, offshore Ireland, through integration of new seismic reflection and gravity data

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DOI	10.1016/j.tecto.2021.228809
	Investigating the Porcupine Atlantic margin, offshore Ireland, through integration of new seismic reflection and gravity data
	Yang P.; Welford J.K.
发表日期	2021
ISSN	00401951
卷号	807
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.
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
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/208106
作者单位	Department of Earth Sciences, Memorial University, St. John's, NL, Canada
推荐引用方式 GB/T 7714	Yang P.,Welford J.K.. Investigating the Porcupine Atlantic margin, offshore Ireland, through integration of new seismic reflection and gravity data[J],2021,807.
APA	Yang P.,&Welford J.K..(2021).Investigating the Porcupine Atlantic margin, offshore Ireland, through integration of new seismic reflection and gravity data.Tectonophysics,807.
MLA	Yang P.,et al."Investigating the Porcupine Atlantic margin, offshore Ireland, through integration of new seismic reflection and gravity data".Tectonophysics 807(2021).