Crustal structure of the Iceland-Faeroe Ridge
Item
Title (Dublin Core)
en-US
Crustal structure of the Iceland-Faeroe Ridge
Description (Dublin Core)
en-US
Knowledge of the crustal structure of the Iceland-Faeroe Ridge is based on results from the North Atlantic Seismic Project of 1972 supplemented by earlier short refraction lines and reflection, gravity and magnetic surveys. The main 5. 7 km/s upper crustal layer is locally overlain by lower velocity layers of variable thickness. The upper crust is interpreted as being predominantly basaltic, comprising lavas, regions of pyroclastic rock and intrusives including ring complexes. A 6.7 km/s lower crustal layer underlies the upper crust at a depth of between about 4 and 8 km along the Ridge; this layer is present also beneath the Icelandic shelf but not beneath the Faeroe shelf. A deeper 7.8 km/s refractor interpreted as the Moho occurs at about 30-35 km depth beneath the south-eastern part of the Ridge, shallowing to about 28 km towards the north-western end of it. A significant increase in velocity with depth within the main 6.7 km/s layer has not been detected but may occur, in which case the Moho would be somewhat deeper. The seismic crustal results are consistent with a gravity profile across the Ridge, which indicates approximate Airy isostatic equilibrium. The crust beneath the Ridge, which is of a thickness more typical of the continents than the oceans, is believed to have been formed by sea-floor spreading during the period 55 to 40 Ma ago.
ARK: https://n2t.net/ark:/88439/y051071
Permalink: https://geophysicsjournal.com/article/80
ARK: https://n2t.net/ark:/88439/y051071
Permalink: https://geophysicsjournal.com/article/80
Creator (Dublin Core)
Bott, M.H.P.
Gunnarsson, K.
Subject (Dublin Core)
en-US
Iceland-Faeroe Ridge
en-US
Crustal structure
en-US
Seismic refraction
en-US
Seismology
Publisher (Dublin Core)
en-US
Journal of Geophysics
Date (Dublin Core)
1980-01-24
Type (Dublin Core)
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
en-US
Peer-reviewed Article
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
https://journal.geophysicsjournal.com/JofG/article/view/80
Source (Dublin Core)
en-US
Journal of Geophysics; Vol 47 No 1 (1980): Journal of Geophysics; 221-227
2643-2986
2643-9271
Language (Dublin Core)
eng
Relation (Dublin Core)
https://journal.geophysicsjournal.com/JofG/article/view/80/40