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

Granado, P. ^[1] ; Tavani, S. ^[2] ; Carrera, N. ^[1] ; Muñoz, J.A. ^[1]
1. [1] Universitat de Barcelona
  
  Universitat de Barcelona
  
  Barcelona, España
2. [2] University of Naples Federico II
  
  University of Naples Federico II
  
  Nápoles, Italia
Localización: Geologica acta: an international earth science journal, ISSN 1695-6133, Vol. 16, Nº. Extra 4, 2018 (Ejemplar dedicado a: . Special Issue: a tribute to Pere Santanach.), págs. 357-373
Idioma: catalán
Enlaces
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Resumen
- 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.