First record of Anisian deposits in the Betic External Zone of southern Spain and its paleogeographical implications

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Títol: First record of Anisian deposits in the Betic External Zone of southern Spain and its paleogeographical implications
Autors: Pérez-Valera, Fernando | Pérez-López, Alberto | Götz, Annette E. | Ros-Franch, Sonia | Márquez-Aliaga, Ana | Baeza Carratalá, José Francisco | Pérez-Valera, Juan Alberto
Grups d'investigació o GITE: Cambios Paleoambientales
Centre, Departament o Servei: Universidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambiente
Paraules clau: Muschelkalk | Pelsonian | Illyrian | Index fossils | Epicontinental platform | Western Tethys
Data de publicació: 24-de març-2023
Editor: Elsevier
Citació bibliogràfica: Sedimentary Geology. 2023, 449: 106374. https://doi.org/10.1016/j.sedgeo.2023.106374
Resum: In the External Zones of the Betic Cordillera (S Spain), upper Muschelkalk (Ladinian) facies have been known for decades; however, so far there is no stratigraphic record of Anisian deposits. In the present study, new biostratigraphic data from a carbonate succession in the easternmost Subbetic domain reveal a Pelsonian-Illyrian (Anisian) age. The nautiloids Germanonautilus salinarius and Germanonautilus saharonicus are documented for the first time in the Iberian Peninsula, and together with the brachiopod Tetractinella trigonella and the bivalves Neoschizodus orbicularis and Myophoria vulgaris they represent marker fossils of Anisian deposits previously described from many other basins, both in the Germanic and Alpine realms. The co-occurrence of the nautiloid G. saharonicus and the bivalve Gervillia joleaudi at the top of the studied succession serves as correlation tool for the first faunal migration event from the Sephardic towards the Subbetic domain. The palynomorph assemblage, including the monosaccate pollen grain Cristianisporites triangulatus, provides further evidence of a late Anisian age. An integrated study of fossil assemblages and sedimentary facies reveals tidal and very shallow-marine environments that characterize an extensive epicontinental platform in the western Tethys along the paleo-margin of the Iberian Massif. Two thin shale intervals represent two distinct transgressive phases, correlative to the Pelsonian maximum-flooding zone recorded in other European basins. The new findings contribute to the ongoing paleogeographic reconstruction of epicontinental platform settings which developed during the Middle Triassic in the Peri-Tethyan realm.
Patrocinadors: This study was supported by Projects PID2019-104625RB-I00 and PGC2018-098272-B-I00, PID2020-114381GB-I00 (Secretaría de Estado de I + D + I, Spain), B-RNM-072-UGR18 (FEDER Andalucía), P18-RT- 074, and RNM-208 (Junta de Andalucía).
URI: http://hdl.handle.net/10045/133148
ISSN: 0037-0738 (Print) | 1879-0968 (Online)
DOI: 10.1016/j.sedgeo.2023.106374
Idioma: eng
Tipus: info:eu-repo/semantics/article
Drets: © 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Revisió científica: si
Versió de l'editor: https://doi.org/10.1016/j.sedgeo.2023.106374
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