A model of electrical resistivity beneath NE-Iceland, correlation with temperature
Item
Title (Dublin Core)
en-US
A model of electrical resistivity beneath NE-Iceland, correlation with temperature
Description (Dublin Core)
en-US
Short period magnetotelluric measurements (15 s–1 h) were made at 19 sites in NE-Iceland, distributed over the neovolcanic zone and the adjoining older Tertiary flood basalt areas. With model-calculations of one- and two-dimensional resistivity distributions a characteristic model was found for the lower crust and upper mantle. Beneath a thin surface layer the resistivity is 100 Ωm except within the active neovolcanic zone where it is 50 Ωm. This layer extends to a layer with low resistivity of 15 Ωm. The low-resistivity layer is about 5 km thick. The depth of its upper boundary increases from 10 km to about 20 km with increasing distance from the rift axis. The resistivity beneath the low-resistivity layer is about 100 Ωm down to at least 100 km. Comparison of field data with laboratory measurements on conductivity at high temperatures indicates that the low-resistivity layer consists of partially molten basalt at a temperature of 1,000° –1,100° C. The underlying layer very probably consists of partially molten ultramafic rocks and is presumably the uppermost part of the mantle beneath Iceland. The basaltic low-resistivity layer is interpreted as the base of the crust formed by upward movement of the basaltic melt fraction from the mantle.
ARK: https://n2t.net/ark:/88439/y021104
Permalink: https://geophysicsjournal.com/article/77
ARK: https://n2t.net/ark:/88439/y021104
Permalink: https://geophysicsjournal.com/article/77
Creator (Dublin Core)
Beblo, M.
Bjornsson, A.
Subject (Dublin Core)
en-US
Magnetotellurics
en-US
Iceland
en-US
Electrical model
en-US
Crust-mantle interface
en-US
Temperature
en-US
Partial melting
en-US
Solid Earth
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/77
Source (Dublin Core)
en-US
Journal of Geophysics; Vol 47 No 1 (1980): Journal of Geophysics; 184-190
2643-2986
2643-9271
Language (Dublin Core)
eng
Relation (Dublin Core)
https://journal.geophysicsjournal.com/JofG/article/view/77/37