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
Other:
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.]
Sections:Petrology
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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