The petrogenesis of Carboniferous-Permian dyke and sill intrusions across northern Europe

L. A. Kirstein, G. R. Davies, M. Heeremans

Research output: Contribution to journalArticlepeer-review

Abstract

The presence or absence of a thermally anomalous mantle plume during the formation of the widespread Carboniferous-Permian magmatism of northern Europe is examined. The geochemistry of representative samples from the extensive Carboniferous-Permian dyke and sill intrusions across northern Europe are reported in order to ascertain whether they have a common 'plume' source. Both tholeiitic and alkaline magmas have diverse trace element compositions. Alkaline samples with relatively low Ti and Nb/La < 1 are considered to originate in the lithospheric mantle and those with Nb/La > 1 from the asthenosphere. The tholeiites have a close affinity to E-MORB but have mixed with variable amounts of lithosphere and upper crust. Tectonic reorganisation and decompression melting of a trace element-enriched mantle is considered to have controlled the Carboniferous-Permian magmatism, which contains no coherent geochemical evidence for a single plume-related thermo-chemical anomaly.

Original languageEnglish
Pages (from-to)721-742
Number of pages22
JournalContributions to Mineralogy and Petrology
Volume152
Issue number6
DOIs
Publication statusPublished - 1 Dec 2006

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