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Structural parameters of Cr-bearing spinels and pleonaste from the Cuillin Igneous Complex (Isle of Skye, Scotland): Implications for metamorphic and cooling history

Published online by Cambridge University Press:  02 January 2018

D. Lenaz ,
M. Velicogna ,
U. Hålenius  and
B. O'Driscoll
D. Lenaz*
Affiliation:
Department of Mathematics and Geosciences, University of Trieste, Italy
M. Velicogna
Affiliation:
Department of Mathematics and Geosciences, University of Trieste, Italy
U. Hålenius
Affiliation:
Department of Geosciences, Swedish Museum of Natural History, Stockholm, Sweden
B. O'Driscoll
Affiliation:
School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK
*
E-mail: lenaz@units.it
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Abstract

The Outer Layered Suite of the Cuillin Igneous Complex (Isle of Skye, NW Scotland) comprises a Peridotite Series and a younger Allivalite Series (the latter comprising troctolites, eucrites and gabbros). Close to the junction between the Peridotite and the Allivalite Series (but wholly contained within the latter), an ultramafic breccia unit containing abundant peridotite xenoliths crops out. In the Peridotite Series, reddish-brown Cr-bearing spinels are present as disseminated crystals in the peridotite and also as chromitite seams, while in the peridotite xenoliths of the breccia unit, green pleonaste occurs in both of these modes of textural occurrence. Optical absorption spectroscopy reveals that the colour difference between the two spinel phases is related mainly to variable Al, Cr and Fe contents, while crystal structural analysis shows that the cooling rate calculated utilizing the oxygen positional parameter is comparable for all samples. The intracrystalline closure temperature for the Cr-spinel in the Peridotite Series is different for the disseminated and seam textural occurrences of the spinels, while the temperatures yielded by pleonaste in the peridotite xenoliths are the same for both textural occurrences. Our dataset suggests that the pleonaste in the peridotite xenoliths has been heated and equilibrated under subsolidus conditions, probably during breccia formation. During this heating, homogenization of the closure temperatures of pleonaste spinels occurred.

Keywords

Cr-spinelpleonasteX-ray single-crystal diffractionintracrystalline closure temperatureIsle of Skye
Type
Research Article
Information
Mineralogical Magazine , Volume 80 , Issue 5 , August 2016 , pp. 749 - 763
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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