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Journal of the Geological Society; 1999; v. 156; issue.2; p. 213-216;
DOI: 10.1144/gsjgs.156.2.0213
© 1999 Geological Society of London

SPECIAL

Platinum-group mineralization in the Rum layered intrusion, Scottish Hebrides, UK

A. R. BUTCHER1,3, D. PIRRIE1, H. M. PRICHARD2 & P. FISHER2

1 Camborne School of Mines, University of Exeter, Redruth, Cornwall TRI5 3SE, UK (e-mail: dpirrie{at}csm.ex.ac.uk)
2 Department of Earth Sciences, Cardiff University, P.O. Box 914, Cardiff CF1 34E, UK

Abundant and diverse platinum-group minerals occur in the Rum layered intrusion, Inner Hebrides, Scotland. Platinum-group minerals are associated with chromite-rich horizons in both the Eastern and Western layered series, and are enclosed by Ni- and Cu-rich sulphides, or silicates. The most common phases are Pd–Cu alloys; Pt–Fe alloys; laurite (Ru(Ir,Os)S2); sperrylite (PtAs2); and Pt–Pd-bearing bismuthides, tellurides and antimonides. The mineralization on Rum is due to: (1) initial concentration in the parental magma linked to a high degree of melting associated with mantle plume activity, and (2) localized concentration due to magma mixing and subsequent crystallization within an open-system magma chamber.





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