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Geometry and regional significance of Neoproterozoic (Cadomian) structures of the Narcea Antiform, NW Spain

F. Diaz Garcia
Geometry and regional significance of Neoproterozoic (Cadomian) structures of the Narcea Antiform, NW Spain
Journal of the Geological Society of London (May 2006) 163 (3): 499-508

Abstract

The Narcea Antiform is located at the hinterland-to-foreland transition of the Variscan belt in the NW of the Iberian massif. It consists of an antiformal stack of fault-propagation folds that developed in the hanging wall of allochthonous thrust sheets during the first Variscan deformation event in the Palaeozoic rocks. The Neoproterozoic Narcea Slates Formation, cropping out in the core of the Narcea Antiform, records a Cadomian deformation event that formed large asymmetric NW-vergent folds, with related axial planar cleavage, developed in the lower greenschist facies. These folds are truncated by the Lower Cambrian angular unconformity. Lower Cambrian conglomerates contain pebbles with predepositional microstructures that are widespread in the underlying Neoproterozoic rocks. The Narcea Antiform provides valuable information concerning major tectonic Cadomian events. The large-scale, near-recumbent Cadomian folds developed between 560 and 540 Ma. Top-to-the-NW kinematics can be deduced for the Cadomian plate convergence (transverse to the Variscan convergence) in present coordinates. It was followed shortly afterwards by large displacements along the northern Gondwana margin that resulted in its accretion alongside the essentially undeformed Neoproterozoic rocks of the Central Iberian Zone before Early Cambrian times.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 163
Serial Issue: 3
Title: Geometry and regional significance of Neoproterozoic (Cadomian) structures of the Narcea Antiform, NW Spain
Author(s): Diaz Garcia, F.
Affiliation: Universidad de Oviedo, Departamento de Geologia, Oviedo, Spain
Pages: 499-508
Published: 200605
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 39
Accession Number: 2006-037825
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps, sects.
N43°40'00" - N43°40'00", W07°00'00" - W07°00'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, 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: 200621
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