Paleogene evolution of the External Betic Zone and geodynamic implications
Guerrera, F. (Università degli Studi di Urbino "Carlo Bo". Dipartimento di Scienze della Terra, della Vita e dell'Ambiente)
Mancheño, M. A. (Universidad de Murcia. Departamento de Química Agrícola, Geología y Edafología)
Martín-Martín, M. (Universitat d'Alacant. Departament de Ciències de la Terra i del Medi Ambient)
Raffaelli, G. (Università degli Studi di Urbino "Carlo Bo". Dipartimento di Scienze della Terra, della Vita e dell'Ambiente)
Rodríguez-Estrella, T. (Universidad Politécnica de Cartagena. Departamento de Ingeniería Minera y Civil)
Serrano, F. (Universidad de Málaga. Departamento de Ecología y Geología)

Data:	2014
Resum:	Interdisciplinary studies combining field data (geological and tectonic mapping, lithostratigraphic reconstructions, lithofacies characterization, correlations and sampling) and laboratory analyses (biostratigraphy, chronostratigraphy, clay mineralogy and sandstone petrography) of eight Senonian-Paleogene successions from the Sierra de La Pila and Sierra de El Carche areas (Murcia province, SE Spain) belonging to the External Betic Zone are presented. Field evidence of tectonic activity (slumps, olistostromes, syn-genetic folds, lateral variability, changes in thicknesses, para- and unconformity boundaries, stratigraphic gaps, shallowing upward trends to emersion, etc. ) was found in several Paleogene intervals. The results enable a better reconstruction of the stratigraphic architecture and chronostratigraphy of the Paleogene record, highlighting in particular: facies evolution, discontinuities, depositional sequences (Middle-Upper Maastrichtian, Upper Paleocene-Middle Eocene, Oligocene-Lower Aquitanian), environmental evolution (homogeneous conditions during the Late Cretaceous and successive realm diversification from platform to slope to basin) and correlations, along the Prebetic to Subbetic transition, which is a key sector to understand the northeastward variations of the South Iberian margin. A conclusive paleogeographic and geodynamic evolutionary model for the study area is proposed, hypothesizing that Paleogene compressive tectonics affected the eastern External Betic Zone. In addition, correlations with successions from the western External Betic Zone evidenced asynchronous deformation from east to west along the internalmost External Betic Zone. Moreover, a comparison with the external Tunisian Tell enables the recognition of similar sedimentarytectonic events, imposing new constraints in the Paleogene geodynamic reconstruction throughout the western Tethys.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Stratigraphy ; Minero-petrography ; Unconformities ; Paleogeography ; Geodynamic evolution
Publicat a:	Geologica acta, Vol. 12 Núm. 3 (September 2014) , p. 171-192, ISSN 1696-5728

Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/280791
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/GeologicaActa2014.12.3.1
DOI: 10.1344/GeologicaActa2014.12.3.1

22 p, 3.0 MB

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