The post-tectonic Cadomian plutonic complex of La Hague, Manche, N. France

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Authors:Power, G. M.; Brewer, T. S.; D'Lemos, R. S.
Author Affiliations:Primary:
Portsmouth Polytech., Dep. Geol., Portsmouth, United Kingdom
Other:
Univ. Nottingham, United Kingdom
Oxford Polytech., 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.261-272; 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. 25 refs.; illus. incl. 2 tables, geol. sketch map
Summary:In this region NW of Cherbourg, the post-tectonic Cadomian Northern granites complex consists of seven rock units ranging in composition from diorites to trondhjemite and K-feldspar granite. With the exception of the Ecuty granite, the units tend to become mineralogically more evolved with decreasing age. They are calc- alkaline and have the characteristics of the products of volcanic arc magmatism; their geochemical differences support the hypothesis of magma formation from several different sources. The Ecuty granite gave a Rb-Sr whole-rock isochron age of 527 +- 4 m.y., the St Germain granite 515 +- 12 m.y. and the Cap de la Hague granodiorite 477 +- 8 m.y., supporting the view that post- tectonic Cadomian activity continued well into Lower Palaeozoic times in the N part of the Armorican Massif. [R.A.H.]
Subjects:Absolute age; Cadomian Orogeny; Dates; Geochemistry; IGCP; Igneous rocks; Major elements; Plutonic rocks; Post-tectonic processes; Rb/Sr; Structural geology; Tectonics; Trace elements; Armorican Massif; Europe; France; Manche France; Western Europe; La Hague; Northern France; Northern Granites Complex
Abstract Numbers:90M/3405
Record ID:1991029956
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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