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Index Geophysics

Magnetotelluric investigation of the lower crust and upper mantle beneath Iceland


Title (Dublin Core)

en-US Magnetotelluric investigation of the lower crust and upper mantle beneath Iceland

Description (Dublin Core)

en-US Magnetotelluric measurements were made at 12 sites on a 210 km long profile in northern and eastern Iceland. The profile crosses areas of different geological age ranging from Tertiary flood basalt to the presently active zone of rifting and volcanism. Beneath the investigated area, at a depth of a few km down to about 20 km there exists a 5 km thick layer with low resistivity amounting to 15 Ωm which is imbedded between layers of higher resistivities. The depth to the low resistivity layer increases with increasing distance from the spreading axis. The low resistivity layer is presumably caused by partial melting at the base of the crust and at the top of the anomalous mantle beneath Iceland. Comparison with laboratory measurements confirms a basaltic composition and a temperature of 1,000-1,100° C of the good conductor, and probably partially molten peridotite in the upper mantle beneath. Mean temperature gradients in the crust calculated from the magnetotelluric data are in good agreement to surface temperature gradients measured in drill holes.

Creator (Dublin Core)

Beblo, M.
Bjornsson, A.

Subject (Dublin Core)

en-US Magnetotellurics
en-US Iceland
en-US Electrical structure
en-US Low resistivity layer
en-US Temperature gradient
en-US Partial melting
en-US Solid Earth

Publisher (Dublin Core)

en-US Journal of Geophysics

Date (Dublin Core)


Type (Dublin Core)

en-US Peer-reviewed Article

Format (Dublin Core)


Identifier (Dublin Core)

Source (Dublin Core)

en-US Journal of Geophysics; Vol 45 No 1 (1978): Journal of Geophysics; 1-16

Language (Dublin Core)


Relation (Dublin Core)