Evidence from mantle xenoliths for an enriched lithospheric keel under the Outer Hebrides

Details Evidence from mantle xenoliths for an enriched lithospheric keel under the Outer Hebrides Evidence from mantle xenoliths for an enriched lithospheric keel under the Outer Hebrides

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.325...44m&link_type=abstract

Nature (ISSN 0028-0836), vol. 325, Jan. 1, 1987, p. 44-47. NERC-supported research.

Mathematics

Logic

16

Earth Mantle, Lithosphere, Petrography, Scotland, Trace Elements, Abundance, Enrichment, Geochemistry, Lithology, Peridotite, Rare Earth Elements

Scientific paper

Recent studies have shown the Lewisian region of Scotland to be underlain by heterogeneous mantle, fragments of which are entrained by magmas that later intrude the crustal rocks of northwest Scotland. Chemical and isotopic data from megacryst suites in these magmas are presented here which point to mineralogical complexity in the lower crust and upper mantle. Moreover, variable trace element ratios in the xenoliths are now recorded as extreme isotopic variations. The Sr and Pb isotopic compositions are similar to those of lamproites and micaceous kimberlites respectively. In contrast, the Nd isotopic ratios are highly variable and overlap with those observed in garnet inclusions in diamonds and lamproitic-potassic volcanic rocks. It is suggested that the Hebridean lithospheric mantle has evolved in a manner totally unlike that of the mantle source regions tapped by Tertiary volcanic rocks erupted in the North Atlantic volcanic province.

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