The Centre 3 layered gabbro intrusion, Ardnamurchan, NW Scotland

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doi: 10.1017/S0016756807003846
Authors:O'Driscoll, B.
Author Affiliations:Primary:
Trinity College Dublin, Department of Geology, Dublin, Ireland
Volume Title:Geological Magazine
Source:Geological Magazine, 144(6), p.897-908. Publisher: Cambridge University Press, London, United Kingdom. ISSN: 0016-7568
Publication Date:2007
Note:In English. 24 refs.; illus., incl. geol. sketch maps
Summary: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.
Sections:Petrology
Subsections:Igneous rocks
Subjects:Cenozoic; Crystallization; Diabase; Diorites; Gabbros; Igneous rocks; Intrusions; Laminations; Layered intrusions; Lithofacies; Lopoliths; Magmatism; Mineral composition; Paleogene; Peridotites; Petrology; Planar bedding structures; Plutonic rocks; Quartz diabase; Ring complexes; Sedimentary structures; Subsidence; Tertiary; Textures; Tonalite; Ultramafics; Ardnamurchan; Argyllshire Scotland; Europe; Great Britain; Highland region Scotland; Scotland; United Kingdom; Western Europe; Great Eucrite Intrusion
Coordinates:N564400 N564500 W0060900 W0061000
Abstract Numbers:07M/4667
Record ID:2008002054
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Abstract, Copyright, Cambridge University Press, Reference includes data from GeoScienceWorld, Alexandria, VA, United States
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