Major element composition of the lithospheric mantle under the North Atlantic Craton; evidence from peridotite xenoliths of the Sarfartoq area, southwestern Greenland

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doi: 10.1007/s00410-003-0499-1
Authors:Bizzarro, Martin; Stevenson, Ross K.
Author Affiliations:Primary:
Geological Museum, Copenhagen, Denmark
Universite du Québec à Montréal, Canada
Volume Title:Contributions to Mineralogy and Petrology
Source:Contributions to Mineralogy and Petrology, 146(2), p.223-240. Publisher: Springer International, Heidelberg-New York, International. ISSN: 0010-7999
Publication Date:2003
Note:In English. 52 refs.; illus., incl. 6 tables, sketch map
Summary:The composition and thermal state of the lithospheric mantle under the N Atlantic craton was investigated using a suite of peridotite xenoliths from the diamond-bearing Sarfartoq kimberlite dyke swarm of southwestern Greenland. Elevated olivine and whole-rock mg (>0.9) attest to the refractory nature of the Sarfartoq mantle showing comparable degrees of depletion to other cratonic roots. Modal analyses indicate that the Sarfartoq mantle is not typified by the orthopyroxene enrichment observed in the Kaapvaal root, but shows more affinity with the Canadian Arctic (Somerset Island), Tanzania, and E Greenland (Wiedemann Fjord) peridotites. The stratification observed in the upper refractory harzburgite layer (70--180 km) is reflected by an increase in fertility (e.g. decrease in olivine abundance and forsterite content) with depth. The sharp nature of the boundary between the upper and lower layers may indicate multistage growth of the lithospheric mantle. [G.L.B.]
Subsections:Igneous petrology
Subjects:Alkalic composition; Chain silicates; Chemical composition; Cratons; Diamond deposits; Dikes; Facies; Geochemistry; Igneous rocks; Inclusions; Intrusions; Kimberlite; Lithosphere; Major elements; Mantle; Metamorphic rocks; Mineral assemblages; Mineral composition; Mineral exploration; Nesosilicates; Olivine; Olivine group; Orthosilicates; P-T conditions; Peridotites; Petrology; Plutonic rocks; Precambrian; Pyroxene group; Silicates; Spectra; Ultramafic composition; Ultramafics; X-ray fluorescence spectra; Xenoliths; Arctic region; Atlantic Ocean; Greenland; North Atlantic; South Greenland; Kangerlussuaq Greenland; Sarfartoq Greenland
Coordinates:N673000 N683000 W0483000 W0510000
Abstract Numbers:04M/528
Record ID:2004031389
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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