Primitive olivine melanephelinite dykes from the Orkney Islands, Scotland

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Authors:Upton, B. G. J.; Mitchell, R. H.; Long, A.; Aspen, P.
Author Affiliations:Primary:
University of Edinburgh, Department of Geology and Geophysics, Edinburgh, United Kingdom
Lakehead University, Canada
Royal Holloway and Bedford New College, United Kingdom
Volume Title:Geological Magazine
Source:Geological Magazine, 129(3), p.319-324. Publisher: Cambridge University Press, London, United Kingdom. ISSN: 0016-7568
Publication Date:1992
Note:In English. 17 refs.; illus. incl. 4 tables, sketch map
Summary:Sr and Nd isotopes in three samples display a narrow range in both systems with 87Sr/86Sr 0.703 and 143Nd/144Nd 0.5125. The data plot on the mantle array on an epsilon Nd- epsilon Sr diagram, suggesting a magma source similar to that of ocean island basalts. The magmas are deduced to have been primitive, small-scale (? < 0.2%) partial melts of the asthenospheric mantle that have experienced relatively little modification in transit through the lithosphere. [C.H.D.]
Subjects:Alkaline earth metals; Camptonite; Chemical composition; Dikes; Genesis; Igneous rocks; Intrusions; Isotopes; Lamprophyres; Metals; Nd-144/Nd-143; Neodymium; Nephelinite; Paleozoic; Permian; Plutonic rocks; Rare earths; Sr-87/Sr-86; Stable isotopes; Strontium; Volcanic rocks; Europe; Great Britain; Orkney Islands; Scotland; United Kingdom; Western Europe
Abstract Numbers:92M/4360
Record ID:1993010330
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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