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Conjugate margins of Canada and Europe; results from deep reflection profiling

C. Keen, C. Peddy, B. de Voogd and D. Matthews
Conjugate margins of Canada and Europe; results from deep reflection profiling
Geology (Boulder) (February 1989) 17 (2): 173-176

Abstract

Deep seismic reflection profiles have been collected across the conjugate margins of the North Atlantic Ocean. The eastern North Atlantic margin is traversed in the Goban Spur region, and the western North Atlantic margin is crossed in the vicinity of Flemish Cap in the Grand Banks region. These seismic profiles allow us to examine the deep structures and mode of extension in crust that was once contiguous. The Flemish Cap and Goban Spur margins have different structural styles: thick and relatively unfaulted crust is present on the Flemish Cap margin west of the continent-ocean boundary, whereas the Goban Spur margin exhibits a zone of extensional faulting and thinned continental crust. The restored rift zone displays overall symmetry in which a bridge of thin crust (< 15 km thick), about 60 km wide, joins the two crustal blocks of normal continental thickness ( approximately 28 km). The configuration of the Moho, the geometry and distribution of the lower crustal reflections, and the overall symmetry of the rift zone favor pure-shear stretching in the lower lithosphere, although either pure or simple shear could accommodate crustal extension.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 17
Serial Issue: 2
Title: Conjugate margins of Canada and Europe; results from deep reflection profiling
Affiliation: Geol. Surv. Can., Bedford Inst. Oceanogr., Dartmouth, NS, Canada
Pages: 173-176
Published: 198902
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 20
Accession Number: 1989-026868
Categories: Solid-earth geophysicsOceanographyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Cambridge Univ., Dep. Earth Sci., Contrib. No. 1277; Geol. Surv. Can., Contrib. No. 33387
Illustration Description: illus. incl. sketch map
N00°00'00" - N75°00'00", W80°00'00" - E20°00'00"
Secondary Affiliation: Cambridge Univ., GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1989
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