The seismic crustal structure of the Ossa-Morena zone and its geological interpretation

The IBERSEIS deep reflection seismic experiment has provided a crustal image of the Variscan orogen of southwest Iberia. A brief presentation of the entire seismic profile is given, and then the Ossa-Morena Zone (OMZ) and its boundaries are considered. The crust of the OMZ is shown to be divided int...

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Detalles Bibliográficos
Autores: Simancas Cabrera, J. F., Carbonell, Ramón, González Lodeiro, Francisco, Pérez Estaún, A., Juhlin, C., Ayarza, P., Azor, A., Martínez Poyatos, David, Ruiz de Almodóvar Sel, Gabriel, Pascual Martínez, Emilio, Sáez Ramos, Reinaldo, Kashubin, A., Alonso Chaves, Francisco Manuel, Álvarez Marrón, J., Bohoyo, Fernando, Castillo, S., Donaire Romero, Teodosio, Expósito Ramos, Inmaculada, Flecha, I., Galadí, E., Galindo Zaldívar, Jesús, González Barrionuevo, Felipe, González Cuadra, P., Macías, I., Martí, D., Martín, A., Martín Parra, L. M., Nieto Liñán, José Miguel, Palm, H., Ruano, Patricia, Ruiz, Mario, Toscano Grande, Antonio
Tipo de recurso: artículo
Fecha de publicación:2004
País:España
Institución:Universidad de Huelva (UHU)
Repositorio:Arias Montano. Repositorio Institucional de la Universidad de Huelva
Idioma:inglés
OAI Identifier:oai:ariasmontano.uhu.es:10272/6678
Acceso en línea:http://hdl.handle.net/10272/6678
Access Level:acceso abierto
Palabra clave:Deep seismic reflection
Structure of the crust
Variscan orogen
Ossa-Morena Zone
Sísmica profunda de reflexión
Estructura de la corteza
Orógeno varíscico
Zona Ossa Morena
Descripción
Sumario:The IBERSEIS deep reflection seismic experiment has provided a crustal image of the Variscan orogen of southwest Iberia. A brief presentation of the entire seismic profile is given, and then the Ossa-Morena Zone (OMZ) and its boundaries are considered. The crust of the OMZ is shown to be divided into an upper crust, characterized by dominantly NE-dipping reflectivity, and a poorly reflective lower crust. The reflectivity of the upper crust has good correlation with the geological cross-section constructed from surface mapping. In the seismic image, the upper crustal geological structures are seen to merge in the middle crust. Nevertheless, the OMZ middle crust is not a mere detachment level, as it shows very unusual features: it appears as a band of strong reflectivity and irregular thickness (the Iberian Reflective Body, IRB) that we interpret as a great sill-like intrusion of basic rocks. The boundaries of the OMZ are considered sutures of the orogen, and their geometrical features, as deduced from geological mapping and the seismic image, are in accordance with the transpressional character of the Variscan collision recorded in SW Iberia. The present Moho is flat, obliterating the root of the orogen.

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