000060799 001__ 60799 000060799 005__ 20170323124743.0 000060799 037__ $$aTAZ-TFG-2017-114 000060799 041__ $$aspa 000060799 1001_ $$aLÓPEZ ARANA, JAVIER 000060799 24200 $$aOrigin of jointing present in the igneous bodies (lava flows and sills), permian in age, of the Atienza sector, NW of the Castilian Branche (Iberian Chain): tectonic-related fracturing vs columnar jointing 000060799 24500 $$aORIGEN DE LA FRACTURACIÓN PRESENTE EN LOS CUERPOS ÍGNEOS (COLADAS Y SILLS), DE EDAD PÉRMICA, DEL SECTOR DE ATIENZA, NO DE LA RAMA CASTELLANA DE LA CORDILLERA IBÉRICA: FRACTURACIÓN TECTÓNICA “VS.” DISYUNCIÓN COLUMNAR. 000060799 260__ $$aZaragoza$$bUniversidad de Zaragoza$$c2017 000060799 506__ $$aby-nc-sa$$bCreative Commons$$c3.0$$uhttp://creativecommons.org/licenses/by-nc-sa/3.0/ 000060799 520__ $$aA detailed study of fractures has been carried out along a subvolcanic andesitic sill and its sandstone host rock, both from the Permian in age. The studied sector is located in the north-western most part of the Iberian Chain, nearby Atienza (in the Guadalajara province, Spain). The detailed study of fractures has been carried out into 7 stations within the study area, wich roughly covers 50km2. This sector is known as an important sector of Lower Permian magmatic outcrops; characterized by volcanic and hypovolcanic materials. The geochemistry of these magmatic intrusions and its chronological relations have been widely studied by different authors, such as Lago et al. (2004, 2005) and Majarena et al. (2015), defining a subvolcanic sill and subsequent volcanic intrusions, both andesitic with very similar petrological compositions. The materials of the subvolcanic sill are severely fractured by different joint families, nonetheless, is notable the lack of considerations about this characteristic and its origin. The structural analysis of joints, at outcrop-scale and by mean of stereographic projections, allows distinguishing the tectonic origin, caused by tectonic efforts, from magmatic, as result of the magma flow cooling. The goal of this paper is to determine the origin of the fractures, present in both the sill and in its host rock, by mean of its geometric and kinematic study, using structural analysis and, eventually, eventually, propose an evolutionary model arranging chronologically the different families. In order to constrein its primary or secondary origin, the data has been contrasted with other fracture families collected from more contemporany rocks such as red sandstones from Buntsandstein facies, whiyte-yellow sandstones of the Utrillas formation and upper Cretaceous limestones, presents in the local stratiigraphyc column. A total of 8 fracture families have been distinguished from the igneous materials. The directional analysis combining with direct observations in the fields, have shown that the origin for families 4 is magmatic and contemporany with the magmatic event during the Lower Permian. On the other hand families 4, only identified in the sedimentary host rocks are considered caused by both syn-emplacement and subsequent tectonic efforts 000060799 521__ $$aGraduado en Geología 000060799 540__ $$aDerechos regulados por licencia Creative Commons 000060799 700__ $$aGil Imaz, Andrés$$edir. 000060799 700__ $$aLago San José, Marceliano$$edir. 000060799 7102_ $$aUniversidad de Zaragoza$$bCiencias de la Tierra$$cGeodinámica Interna 000060799 8560_ $$f630582@celes.unizar.es 000060799 8564_ $$s3109434$$uhttps://zaguan.unizar.es/record/60799/files/TAZ-TFG-2017-114.pdf$$yMemoria (spa) 000060799 909CO $$ooai:zaguan.unizar.es:60799$$pdriver$$ptrabajos-fin-grado 000060799 950__ $$a 000060799 951__ $$adeposita:2017-03-23 000060799 980__ $$aTAZ$$bTFG$$cCIEN