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ardnamurchan

Geological Magazine (1)

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The Centre 3 layered gabbro intrusion, Ardnamurchan, NW Scotland
B. O'Driscoll
Journal:

Geological Magazine / Volume 144 / Issue 6 / November 2007

Published online by Cambridge University Press:

21 September 2007, pp. 897-908
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Detailed remapping of the Palaeogene Ardnamurchan Centre 3 gabbros, NW Scotland, suggests that this classic sequence of ring-intrusions forms a composite layered lopolith. The area mapped by previous studies as the Great Eucrite gabbro intrusion comprises 70% by area of Centre 3. Field observations suggest that most of the other smaller ring-intrusions of Centre 3 (interior to the Great Eucrite) constitute either distinct petrological facies of the same intrusion, or included country-rock or peridotite blocks. These observations, together with syn-magmatically deformed inward-dipping modal layering, are used here to support the interpretation that significant central sagging occurred in the intrusion at a late stage in its crystallization history.