The structure and petrology of ultrabasic rocks in the southern part of the Cuillin Igneous Complex, Isle of Skye

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Authors:Claydon, R. V.; Bell, B. R.
Author Affiliations:Primary:
University of Glasgow, Department of Geology and Applied Geology, Glasgow, United Kingdom
Volume Title:Transactions of the Royal Society of Edinburgh: Earth Sciences
Source:Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol.83(Part 4), p.635-653. Publisher: RSE Scotland Foundation, Edinburgh, United Kingdom. ISSN: 0263-5933
Publication Date:1992
Note:In English. 54 refs.; illus., incl. 2 tables, sketch map
Summary:The ultrabasic rocks of the S portion of this early Tertiary complex are recognized as forming a peridotite series and have been classified into six distinct structural-lithological units. These units range from almost pure dunite through to feldspathic peridotites and allivalites at the highest structural levels. Both cumulus and postcumulus processes involving ultrabasic (picritic) magmas were identified; the postcumulus processes have significantly modified many of the primary features of these rocks. Layering is present within all six units, and is particularly prominent in the higher units. Differing orientations of fabrics defined by cumulus spinel and intercumulus plagioclase layers in unit 3 indicate the important role of compaction and intercumulus melt migration. Unit 4 is extremely heterogeneous, involving material ranging from peridotite to allivalite, provides evidence for postcumulus melt movement, magma-mixing, disruption and brecciation. Units 5 and 6 developed a more porous cumulus framework, giving rise to dendritic growths involving cumulus olivine and poikilitic plagioclase. [R.A.H.]
Subjects:Cenozoic; Cumulates; Dunite; Igneous rocks; Mixing; Peridotites; Plutonic rocks; Tertiary; Ultramafics; Europe; Great Britain; Hebrides; Highland region Scotland; Inner Hebrides; Inverness-shire Scotland; Isle of Skye; Scotland; United Kingdom; Western Europe; Allivalite; Cuillin Igneous Complex
Abstract Numbers:93M/3499
Record ID:2009090044
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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