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Isotopic and geochemical investigation of unit 10 from the Eastern Layered Series of the Rhum Intrusion, Northwest Scotland

Published online by Cambridge University Press:  01 May 2009

Z. A. Palacz  and
S. R. Tait
Z. A. Palacz
Affiliation:
Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, U.K.
S. R. Tait
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Place, Cambridge, CB2 3EQ, U.K.
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Abstract

Sr and Nd isotopic compositions together with whole rock Sr and Nd abundances and olivine compositions are presented for cumulates from unit 10 of the Eastern Layered Series of the Rhum intrusion, Northwest Scotland.

The results show an Nd–Sr isotopic correlation consistent with contamination by high 87Sr/86Sr, low 143Nd/144Nd crust. There is a strong correlation between the degree of contamination, Sr and Nd whole rock abundance and Fe enrichment in cumulus olivine. The allivalites are the most contaminated, while the basal peridotites are uncontaminated. This suggests that the cumulates crystallized from a primitive uncontaminated magma and the allivalites from an evolved contaminated magma. Subsequently, movement of contaminated feldspathic intercumulus liquid has perturbed the isotopic, trace element and olivine composition of the upper peridotites.

Type
Articles
Information
Geological Magazine , Volume 122 , Issue 5 , September 1985 , pp. 485 - 490
Copyright
Copyright © Cambridge University Press 1985

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