Cadomian magmatism in the North Armorican Massif

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Authors:Brown, Michael; Power, G. M.; Topley, C. G.; D'Lemos, R. S.
Author Affiliations:Primary:
Kingston Polytech., Sch. Geol. Sci., Kingston upon Thames, United Kingdom
Other:
Portsmouth Polytech., United Kingdom
Oxford Polytech., United Kingdom
Volume Title:Cadomian Orogeny
Volume Authors:D'Lemos, R. S., editor; Strachan, R. A.
Source:Geological Society Special Publications, Vol.51, p.181-213; 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. 23 refs.; illus. incl. 2 tables, geol. sketch maps
Summary:Cadomian magmatism in the NE part of the Armorican Massif is reviewed. It represents approx 275 m.y. of plutonic activity broadly related to subduction beneath a continental margin. The early part of the Cadomian orogenic cycle included volcanic-arc plutonic suites and basaltic rocks with associated feeder dykes. The peak of the Cadomian orogeny involved intra- or behind-arc basin inversion with concomitant mid-crustal anatexis and sinistrally transpressive terrain accretion approx 540 m.y. ago. The late evolution began with andesite-rhyolite volcanism, and calc-alkaline plutonism occurred over a period of approx 100 m.y. during the decay of the Cadomian subduction zone system. A wealth of geochemical whole-rock data is summarized diagrammatically. [R.A.H.]
Subjects:Cadomian Orogeny; Chemical composition; Emplacement; IGCP; Orogeny; Precambrian; Processes; Proterozoic; Shear zones; Structural geology; Tectonics; Terranes; Upper Precambrian; Armorican Massif; Europe; France; Western Europe; Igneous activity
Abstract Numbers:90M/3401
Record ID:1991029952
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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