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Middle Jurassic shear zones at Cap de Creus (eastern Pyrenees, Spain); a record of pre-drift extension of the Piemonte-Ligurian Ocean?

Reinoud L. M. Vissers, Douwe J. J. van Hinsbergen, Camilla M. Wilkinson and Morgan Ganerod
Middle Jurassic shear zones at Cap de Creus (eastern Pyrenees, Spain); a record of pre-drift extension of the Piemonte-Ligurian Ocean?
Journal of the Geological Society of London (November 2016) 174 (2): 289-300

Abstract

The Cap de Creus peninsula in NE Spain consists of greenschist- to amphibolite-facies metasediments and granitoid bodies of the Variscan Axial Zone of the Pyrenees, overprinted in the north by anastomosed greenschist-facies shear zones. Current tectonic interpretations ascribe these shear zones to the waning stages of the Variscan orogeny. We present muscovite (super 40) Ar/ (super 39) Ar data from the shear zones, yielding Middle Jurassic ages between 159.33+ or -0.43 and 175.18+ or -1.10 Ma and one Tertiary age of 58.57+ or -0.55 Ma. We suggest that the present-day structure at Cap de Creus resulted from Variscan deformation and HT-LP metamorphism, followed during the Jurassic by crustal stretching and development of ductile normal faults reflecting pre-drift continental extension related to opening of the Piemonte-Ligurian basin east of Iberia. Tilting during Alpine convergence caused steepening in the northern part of the peninsula, with the ductile normal faults rotated to their present orientations appearing as dextral reverse shear zones. The shear zone yielding a Tertiary age could reflect either an Alpine structure or reactivation of an earlier, presumably Jurassic shear zone. The Cap de Creus structure may thus represent a continental margin that has undergone ductile stretching equivalent to the now-buried west Iberian or Newfoundland margin.


ISSN: 0016-7649
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 174
Serial Issue: 2
Title: Middle Jurassic shear zones at Cap de Creus (eastern Pyrenees, Spain); a record of pre-drift extension of the Piemonte-Ligurian Ocean?
Affiliation: University of Utrecht, Department of Earth Sciences, Utrecht, Netherlands
Pages: 289-300
Published: 20161122
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 39
Accession Number: 2017-005958
Categories: Structural geologyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch maps
N42°19'60" - N42°19'60", E03°19'60" - E03°19'60"
Secondary Affiliation: Geological Survey of Norway, NOR, Norway
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201705
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