Upper Proterozoic basaltic volcanism in the northern Massif Armoricain, France

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Authors:Lees, G. J.; Roach, R. A.; Shufflebotham, M. M.; Griffiths, N. H.
Author Affiliations:Primary:
Univ. Keele, Dep. Geol., Staffordshire, United Kingdom
Other:
Oxford Polytech., United Kingdom
Univ. Coll. Cardiff, United Kingdom
Volume Title:Geochemistry and mineralization of Proterozoic volcanic suites
Volume Authors:Pharaoh, Tim C., editor; Beckinsale, Robert D.; Rickard, David Terence
Source:Geological Society Special Publications, Vol.33, p.503-523; Geochemistry and mineralization of Proterozoic volcanic suites, Keyworth, United Kingdom, Apr. 1986, edited by Tim C. Pharaoh, Robert D. Beckinsale and David Terence Rickard. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0305-8719
Publication Date:1987
Note:In English. 42 refs.; illus. incl. 3 tables, sects., geol. sketch maps
Summary:A 2 km thick sequence of subaqueous basaltic rocks -- the Hillion-Erquy volcanic formation (HEVF) -- forms the lower part of the late Proterozoic Brioverian supracrustal sequence around the Baie de St Brieuc, N Brittany. It is proposed that the HEVF was erupted in a rapidly subsiding ensialic basin, formed during a phase of crustal extension. Volcanism ceased abruptly and the basin rapidly filled with sediment. [J.M.H.]
Subjects:Andesites; Basalts; Brioverian; Dikes; Geochemistry; IGCP; Igneous rocks; Intrusions; Major elements; Metamorphism; Neoproterozoic; Precambrian; Proterozoic; Regional metamorphism; Trace elements; Upper Precambrian; Volcanic rocks; Volcanism; Armorican Massif; Brittany; Europe; France; Western Europe; Baie de Saint Brieuc; Hillion-Erquy volcanic formation
Coordinates:N484000 N490000 W0023000 W0024000
Abstract Numbers:89M/1867
Record ID:1988045747
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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