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TitleThe intermediate-wavelength magnetic anomaly maps of the North Atlantic Ocean derived from satellite and shipborne data
AuthorArkani-Hamed, J; Verhoef, J; Roest, W; Macnab, R
SourceGeophysical Journal International vol 123, 1995 p. 727-743, (Open Access)
Alt SeriesGeological Survey of Canada, Contribution Series 38094
PublisherOxford University Press (OUP)
Mediapaper; on-line; digital
File formatpdf
ProvinceNorthern offshore region; Eastern offshore region
AreaNorth Atlantic Ocean; Labrador Sea
Lat/Long WENS -90.0000 -10.0000 80.0000 20.0000
Subjectsmarine geology; geophysics; magnetic interpretations; magnetic anomalies; magnetic surveys; magnetic surveys, airborne; magnetic surveys, ship; geophysical surveys; satellite imagery; oceanic lithosphere; sea floor spreading; Cretaceous
Illustrationssketch maps; graphs
Two intermediate-wavelength magnetic anomaly maps of the North Atlantic Ocean are derived based on satellite and marine magnetic observations. The satellite map is produced from the covariant features of POGO and Magsat dawn and Magsat dusk magnetic anomalies. The marine map is compiled using shipborne data collected since 1965. The two maps are in excellent agreement over well-defined anomalies both in location and amplitude, suggesting that these anomalies are real and reflect magnetization contrasts in the oceanic lithosphere. Both maps show the intermediate-wavelength seafloor-spreading anomalies of the Cretaceous quiet zone of the central North Atlantic Ocean as well as the negative seafloor-spreading anomaly of the Labrador Sea caused by dominantly reversed polarity periods. The Iceland hotspot, Alpha Ridge, Azores High, King's Trough and the Rockall microcontinent have positive anomalies. There is no consistent magnetic signature associated with the ocean-continent boundary, although the deep sedimentary basin of Nova Scotia is delineated by a well-defined negative anomaly.