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The Centre 3 layered gabbro intrusion, Ardnamurchan, NW Scotland

Department of Geology, Museum Building, Trinity College Dublin, Dublin 2, Ireland

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.

Key Words: Ardnamurchan • gabbros • layered intrusion • lopolith

This article has been cited by other articles:

				B. O'Driscoll, C. T. E. Stevenson, and V. R. Troll Mineral Lamination Development in Layered Gabbros of the British Palaeogene Igneous Province: A Combined Anisotropy of Magnetic Susceptibility, Quantitative Textural and Mineral Chemistry Study J. Petrology, June 1, 2008; 49(6): 1187 - 1221. [Abstract] [Full Text] [PDF]