La cuenca neógena extensional de El Pobo (Teruel, Cordillera Ibérica): sedimentología, estructura y relación con la evolución del relieve
Resumen: This work integrates the stratigrahical and sedimentological analysis of the Neogene sedimentary record, the extensional structure and the development of coeval planation surfaces of the El Pobo Depression (eastern Iberian Chain, Spain), which has allowed defining the new El Pobo sedimentary basin and its evolution. The Neogene El Pobo Basin is located on the footwall block of the Sierra de El Pobo fault zone, and is separated into two subbasins. Such subbasins have a double control: (i) differential erosion of soft rocks (Late Jurassic-Early Cretaceous in age) on both sides of the Ababuj anticline core, which created the initial accommodation space; (ii) tectonic structure: two N-S trending half-grabens whose eastern boundaries are extensional faults synthetic with the Sierra de El Pobo fault zone, with their respective western boundaries representing passive margins in which gently tilting Neogene beds onlap Mesozoic units. The stratigraphical and sedimentological study of the Neogene in-fill shows that the western subbasin was characterized by alluvial systems with a concentric drainage, while in the eastern subbasin a fluvial-alluvial system with northwards axial drainage prevailed. Pale-ostress systems inferred from mesostructures (faults, solution lineations in conglomerate pebbles) indicate that basin development occurred within an extensional tectonic regime. Two main planation surfaces developed at the El Pobo area: intra-Miocene Erosion Surface (SEI, topping the Sierra de El Pobo relief), and Fundamental Erosion Sun, ace (SEF, modeling the eastern El Pobo pediment and splitting into three levels). The SEF upper level correlates with the upper limit of sedimentation over most of the basin, while the SEF middle, main level developed after Neogene sediments were deposited and then tilted by a major deformation episode. Such evolutionary millstones, together with correlations of megasequential patterns with the Teruel Basin, constrain the age of the El Pobo Basin between ca. 9.0 Ma and 3.8 Ma.eo del anticlinal de Ababuj, que creó el espacio de aco- modación inicial; (ii) estructura tectónica extensional: dos semigrabens con sendas fallas N-S en los bordes orientales, y con márgenes occidentales pasivos donde el Neógeno se dispone en onlap sobre el Mesozoico. La subcuenca occidental está rellena por sistemas aluviales concéntricos, y la oriental por cajada en la Superficie de Erosión Intramiocena que corona la Sierra de El Pobo, modela el piede- monte de enlace con la depresión y se desdobla en tres niveles. El nivel superior se correlaciona con el techo de la sedimentación; el nivel intermedio se desarrolla tras concluir la sedimentación y ser bas- culados los depósitos por un episodio tectónico. Estos hitos evolutivos, junto con la evolución de pale- oesfuerzos y la correlación de patrones megasecuenciales con la Cuenca de Teruel, acotan la edad de la Cuenca de El Pobo entre 9, 0 y 3, 8 Ma.
Idioma: Español
Año: 2019
Publicado en: REVISTA DE LA SOCIEDAD GEOLOGICA DE ESPANA 32, 2 (2019), 17-42
ISSN: 0214-2708

Originalmente disponible en: Texto completo de la revista

Factor impacto SCIMAGO: 0.464 - Geology (Q2)

Tipo y forma: Article (Published version)
Área (Departamento): Área Geodinámica Interna (Dpto. Ciencias de la Tierra)

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