Extension and magmatism in the Oslo rift, southeast Norway: No sign of a mantle plume

Details Extension and magmatism in the Oslo rift, southeast Norway: No sign of a mantle plume Extension and magmatism in the Oslo rift, southeast Norway: No sign of a mantle plume

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.123..317p&link_type=abstract

Earth and Planetary Science Letters, Volume 123, Issue 1-3, p. 317-329.

Computer Science

11

Scientific paper

The Late Carboniferous-Permian (300-240 Ma) Oslo Graben in southeast Norway is a classical continental magmatic rift. About 8-12 km of mafic magma was produced during a period of 40-60 My. The mantle-derived rock volume is ~ 3 × 105 km3, with an average melt production rate of ~ 0.005 km3y-1. Initial subsidence and the onset of magmatism preceded graben formation by 5-10 My. Upper crust extension, inferred from dykes and faults, is <= 10%, whereas the total crust appears to have been thinned by up to 30%. The mantle upwelled with a velocity < 2 mMy-1 and suffered conductive heat loss. Adiabatic melting models, therefore, do not apply. A melting model that takes into account syn-rift conductive cooling, depth-variable stretching and mantle composition, suggests that the lithospheric solidus must have been reduced relative to anhydrous peridotite and that mantle thinning should be greater than crustal stretching. The lithospheric affinity of primitive rocks, the initial subsidence, the absence of a hot spot track and the low magma production rate indicate that Oslo Graben magmatism was not associated with a mantle plume. We conclude that the Oslo Graben was more `wet' than `hot' and that extension and magmatism were caused by passive necking of the lithosphere.

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