Picritic magmas and the Rum ultramafic complex, Scotland

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doi: 10.1017/S0016756802006684
Authors:Upton, B. G. J.; Skovgaard, A. C.; McClurg, J.; Kirstein, L.; Cheadle, M.; Emeleus, C. H.; Wadsworth, W. J.; Fallick, A. E.
Author Affiliations:Primary:
Edinburgh University, Department of Geology and Geophysics, Copenhagen, Denmark
Danish Lithosphere Centre, United States
University of Wyoming, United Kingdom
Durham University, United Kingdom
Manchester University, United Kingdom
Scottish Universities Environmental Research Centre
Volume Title:Geological Magazine
Source:Geological Magazine, 139(4), p.437-452. Publisher: Cambridge University Press, London, United Kingdom. ISSN: 0016-7568
Publication Date:2002
Note:In English. 63 refs.; illus., incl. 3 tables, geol. sketch map
Summary:Three small picrite dykes intruded at a late stage in the evolution of the Rum basic-ultrabasic complex shed new light on the magmas responsible for the main complex. The magmas are of transitional (mildly alkaline) type, generated by relatively small-fraction (6-7%) melting of a depleted mantle source. One of the picrites has very primitive characteristics, with olivine Fo93 containing highly aluminous spinels. Sr, Nd and Pb isotopes indicate ≤ 4% contamination with Precambrian crustal lithologies, reflecting the rapidity of magma ascent. The Rum picrites have 187Os/188Os ratios and trace element characteristics comparable to those of recent picrites from Iceland, suggesting minimal temporal change of the depleted parts of the Iceland plume over 60 m.y. [R.A.H.]
Subsections:Igneous petrology
Subjects:Alkali metals; Alkaline earth metals; Chemical composition; Dikes; Igneous rocks; Intrusions; Isotope ratios; Isotopes; Magmas; Mantle; Mantle plumes; Metals; Mineral composition; Petrography; Picrite; Plutonic rocks; Radioactive isotopes; Rb-87/Sr-86; Rubidium; Stable isotopes; Strontium; Ultramafic composition; Ultramafics; Europe; Great Britain; Hebrides; Highland region Scotland; Iceland; Inner Hebrides; Inverness-shire Scotland; Rhum; Scotland; United Kingdom; Western Europe
Coordinates:N565500 N570500 W0061500 W0063000
Abstract Numbers:03M/888
Record ID:2003014281
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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