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GEOREF RECORD

Timing of Cadomian deformation and magmatism within La Hague, NW France

J. D. Inglis, S. D. Samson, R. S. D'Lemos and B. V. Miller
Timing of Cadomian deformation and magmatism within La Hague, NW France
Journal of the Geological Society of London (March 2005) 162 (2): 389-400

Abstract

The La Hague peninsula, Normandy, NW France, contains the most northerly components of the Late Neoproterozoic Cadomian orogeny. U-Pb dates for single-grain and small multiple-grain zircon separates from carefully selected plutons provide geochronological constraints on the timing of deformation and magmatism within the region. The syntectonic Jardeheu quartz diorite and Omonville granodiorite were emplaced and contemporaneously deformed during the development of a greenschist-facies fabric, pervasive across the peninsula. U-Pb zircon dates of 610+ or -1 Ma for the Jardeheu quartz diorite and 608+ or -2 Ma for the Omonville granodiorite are similar to a previously reported sensitive high-resolution ion microprobe U-Pb date for metamorphism of the basement, and indicate that a regionally significant period of metamorphism and magmatism occurred between 620 and 608 Ma. An emplacement age of 573.9 +1.3/-0.9 Ma for the syntectonic Thiebot granodiorite places limits on the timing of deformation along the Thiebot Shear Zone. Zircons from the undeformed St Martin monzonite give a precise U-Pb age of 581.3+ or -1.1 Ma. The new dates point to reactivation of magmatism and localized greenschist-facies deformation between 582 and 573 Ma.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 162
Serial Issue: 2
Title: Timing of Cadomian deformation and magmatism within La Hague, NW France
Affiliation: Syracuse University, Department of Earth Sciences, Syracuse, NY, United States
Pages: 389-400
Published: 200503
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 38
Accession Number: 2005-024562
Categories: Geochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch maps
N48°30'00" - N49°45'00", W02°00'00" - W00°45'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200513
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