The Northern Igneous Complex of Guernsey, Channel Islands

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Authors:Topley, C. G.; Brown, Michael; D'Lemos, R. S.; Power, G. M.; Roach, R. A.
Author Affiliations:Primary:
Oxford Polytech., Dep. Geol., Oxford, United Kingdom
Other:
Kingston Polytech., United Kingdom
Portsmouth Polytech., United Kingdom
Univ. Keele, United Kingdom
Volume Title:Cadomian Orogeny
Volume Authors:D'Lemos, R. S., editor; Strachan, R. A.; Topley, C. G.
Source:Geological Society Special Publications, Vol.51, p.245-259; The Cadomian Orogeny, Oxford, United Kingdom, Apr. 1988, edited by R. S. D'Lemos, R. A. Strachan and C. G. Topley. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0305-8719
Publication Date:1990
Note:In English. 22 refs.; illus. incl. 25 anal., 1 table, cols., geol. sketch maps
Summary:This complex consists of four intrusive bodies, the St Peter Port gabbro, the Bordeaux diorite complex, the Cobo granite and L'Ancresse granodiorite. They were emplaced in that order over a small time span, but were all intruded 2500 m.y. ago. The St Peter Port gabbro is a layered body; the layering and the geochemical variation can be explained by invoking magmatic processes. The Bordeaux diorite complex ranges from meladiorite to granodiorite, the magmas of which are shown to have been contemporaneously mobile although not related directly to each other by fractionation. The Cobo granite is homogeneous but has a complex relationship with the diorite complex. The L'Ancresse granodiorite is lithologically and geochemically homogeneous. [R.A.H.]
Subjects:Chemical composition; Diorites; Emplacement; Gabbros; Geochemistry; Granites; Granodiorites; IGCP; Igneous rocks; Plutonic rocks; Structural geology; Tectonics; English Channel Islands; Europe; Guernsey; United Kingdom; Western Europe; Northern Igneous Complex
Abstract Numbers:90M/3404
Record ID:1991029955
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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