Deformation pattern around the Conejera fault blocks (Asturian Basin, North Iberian Margin)

Geologica Acta

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Title Deformation pattern around the Conejera fault blocks (Asturian Basin, North Iberian Margin)
 
Creator GRANADO, P.
TAVANI, S.
CARRERA, N.
MUÑOZ, J.A.
 
Subject Asturian Basin; Conejera Fault blocks; Deformation patterns; Reactivation; North Iberian Margin.
 
Description The Asturian Basin is located on the coastline of the North Iberian Margin. This basin is dissected by long-lived E-, NE- and NW-striking faults that delineate a series of extensional fault blocks that became shortened during the Upper Cretaceous to Cenozoic Alpine convergence. In the Conejera cove, the NE-striking and SE-dipping Conejera Fault displays a remarkable example of contractional deformation, promoted by the mechanical contrast within the Lower to Middle Jurassic stratigraphic series. Field observations and structural analysis carried out in this study reveal: i) a first system of orthogonal cross-joints oblique to the Conejera Fault and other major onshore boundary faults, ii) a second system of meso-extensional faults parallel to the Conejera Fault, and developed by the reactivation and linkage of the orthogonal cross-joints and iii) a series of contractional folds, thrusts and pressure solution with a predominant NE to ENE trend. Observed relationships and structural analysis suggest an obliquity between the here inferred direction of the Late Jurassic-Early Cretaceous stretching (i.e. about N015E) and the onshore boundary faults, whereas the contractional structures are broadly parallel to the NE-striking Conejera Fault and suggest a roughly SSE- to SE-oriented Alpine convergence.
 
Publisher Geologica Acta
Geologica Acta
Geologica Acta
 
Contributor Institut de Recerca Geomodels
Geodinàmica i Analisi de Conques research group (2014SGR467SGR)
 
Date 2018-12-20
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion

 
Format application/pdf
 
Identifier http://revistes.ub.edu/index.php/GEOACTA/article/view/GeologicaActa2018.16.4.2
10.1344/GeologicaActa2018.16.4.2
 
Source Geologica Acta; Vol 16, No 4: Contributions to the geological evolution of the Iberian Peninsula: a tribute to Pere Santanach; 357-373
Geologica Acta; Vol 16, No 4: Contributions to the geological evolution of the Iberian Peninsula: a tribute to Pere Santanach; 357-373
Geologica Acta; Vol 16, No 4: Contributions to the geological evolution of the Iberian Peninsula: a tribute to Pere Santanach; 357-373
1696-5728
1695-6133
 
Language eng
 
Relation http://revistes.ub.edu/index.php/GEOACTA/article/view/GeologicaActa2018.16.4.2/23880
 
Coverage Iberian Peninsula; North Iberian Margin; Asturian Basin
Late Variscan; Jurassic

 
Rights Copyright (c) 2018 Geologica Acta
 

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