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Rare earth element distribution in a metasomatic zoned ultramafic pod from Fiskenaesset, West Greenland

Published online by Cambridge University Press:  05 July 2018

M. B. Fowler ,
C. T. Williams  and
P. Henderson
M. B. Fowler
Affiliation:
Department of Geology, Imperial College, London SW7 2BP
C. T. Williams
Affiliation:
Department of Mineralogy, British Museum (Natural History), London SW7 5BD
P. Henderson
Affiliation:
Department of Mineralogy, British Museum (Natural History), London SW7 5BD
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Abstract

The distribution of REE in a zoned ultramafic pod formed by incomplete re-equilibration of ultrabasic and quartzofeldspathic reactant compositions has been studied. Transport of the heavy REE (HREE) as well as the light REE (LREE) over several metres has occurred during the diffusion-controlled metasomatism of the protolith mineral assemblages. The largest resultant concentration range (Eu) exceeds two orders of magnitude. In general, REE abundances increase towards the marginal zones, and differences between the behaviour of LREE, middle REE (MREE) and HREE subgroups are observed. LREE are least mobile in the aqueous transporting medium. Complexing by carbonate ligands is probably not an important factor in this system, and the final REE distribution is thought to be governed largely by the crystal structure of the major zonal minerals.

Type
Research Article
Information
Mineralogical Magazine , Volume 47 , Issue 345 , December 1983 , pp. 547 - 553
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1983

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