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The onset of the North Atlantic Igneous Province in a rifting perspective

Published online by Cambridge University Press:  25 March 2009

J. HANSEN ,
D. A. JERRAM ,
K. McCAFFREY  and
S. R. PASSEY
J. HANSEN*
Affiliation:
Department of Earth Sciences, Durham University, South Road, DH1 3LE, Durham, United Kingdom
D. A. JERRAM
Affiliation:
Department of Earth Sciences, Durham University, South Road, DH1 3LE, Durham, United Kingdom
K. McCAFFREY
Affiliation:
Department of Earth Sciences, Durham University, South Road, DH1 3LE, Durham, United Kingdom
S. R. PASSEY
Affiliation:
Jarðfeingi (Faroese Earth and Energy Directorate), Brekkutún 1, P.O. Box 3059, FO-110, Tórshavn, Faroe Islands
*
†Author for correspondence: [email protected]; [email protected]
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Abstract

The processes that led to the onset and evolution of the North Atlantic Igneous Province (NAIP) have been a theme of debate in the past decades. A popular theory has been that the impingement on the lower lithosphere of a hot mantle plume (the ‘Ancestral Iceland’ plume) initiated the first voluminous outbursts of lava and initiated rifting in the North Atlantic area in Early Palaeogene times. Here we review previous studies in order to set the NAIP magmatism in a time–space context. We suggest that global plate reorganizations and lithospheric extension across old orogenic fronts and/or suture zones, aided by other processes in the mantle (e.g. local or regional scale upwellings prior to and during the final Early Eocene rifting), played a role in the generation of the igneous products recorded in the NAIP for this period. These events gave rise to the extensive Paleocene and Eocene igneous rocks in W Greenland, NW Britain and at the conjugate E Greenland–NW European margins. Many of the relatively large magmatic centres of the NAIP were associated with transient and geographically confined doming in Early Paleocene times prior to the final break-up of the North Atlantic area.

Keywords

flood basaltsriftingorogenic suturesNorth Atlantic
Type
Original Article
Information
Geological Magazine , Volume 146 , Issue 3 , May 2009 , pp. 309 - 325
Copyright
Copyright © Cambridge University Press 2009

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