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Title: | Deformation pattern around the conejera fault blocks (asturian basin, north iberian margin) |
Author: | Granado, Pablo Tavani, Stefano Carrera García de Cortázar, Núria Muñoz, J. A. |
Keywords: | Península Ibèrica Astúries Deformació de les roques Geologia estructural Iberian Peninsula Asturias Rock deformation Structural geology |
Issue Date: | 1-Jul-2018 |
Publisher: | (UB). (ICTJA). (IDEA). (UAB). (CSIC) |
Abstract: | 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. |
Note: | Reproducció del document publicat a: https://doi.org/10.1344/GeologicaActa2018.16.3.19968 |
It is part of: | Geologica Acta, 2018, vol. 16, num. 4, p. 357-373 |
URI: | http://hdl.handle.net/2445/147731 |
Related resource: | https://doi.org/10.1344/GeologicaActa2018.16.3.19968 |
ISSN: | 1695-6133 |
Appears in Collections: | Articles publicats en revistes (Dinàmica de la Terra i l'Oceà) |
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