Title of dataset: Deep seismic reflection profile (IBSERSEIS Normal Incidence Transect).

Author: Perez-Estaun, A., Simancas, J. F., Gonzalez Lodeiro, F., Ayarza, P., Azor, A., Juhlin, C., Saez, R., Almodovar, G. R., and Carbonell, R. 

Contact details: Carbonell, R., rcarbo@ictja.csic.es

Issue date: 07/2001 

Identifier: 	http://hdl.handle.net/10261/193954

Citation: Perez-Estaun, A., Simancas, J. F., Gonzalez Lodeiro, F., Ayarza, P., Azor, A., Juhlin, C., Saez, R., Almodovar, G. R., and Carbonell, R. (2001). Deep high resolution seismic reflection profile (IBSERSEIS Transect), DIGITAL.CSIC, http://dx.doi.org/10.20350/digitalCSIC/9016


Description: IBERSEIS Normal Incidence (IBERSEIS-NI) is a NE-SW oriented deep seismic reflection profile that provided for the first time a complete section at crustal scale of the Variscan Iberian Massif in the SW of Spain. This seismic profile samples three major tectonic terranes: the South Portuguese Zone, the Ossa-Morena Zone, and the Central Iberian Zone. These terranes show a distinctive seismic signature, as do the sutures separating them. Late strike-slip movements through crustal wedges are apparent in the seismic image and have strongly modified the geometry of sutures. The upper crust appears to be decoupled from the lower crust all along the seismic line, but some deformation has been accommodated at deeper levels. A sill-like structure is imaged in the middle crust as a 1 2 s thick and 175 km long high-amplitude conspicuous reflective band. It is interpreted as a great intrusion of mafic magma in a mid-crustal decollement. Taking into account surface geological data and the revealed crustal architecture, a tectonic evolution is proposed for SW Iberia which includes transpressional collision interacting during Early Carboniferous with a mantle plume. The Moho can be identified along the entire transect as subhorizontal and located at 10 to 11 s, indicating a 30 35 km average crustal thickness. Its seismic signature changes laterally, being very reflective beneath the South Portuguese Zone and the Central Iberian Zone, but discontinuous and diffuse below the Ossa Morena Zone.

Access and reuse: CC BY 4.0

Referring article: Simancas, J.F., Carbonell, R., Gonzalez Lodeiro, F., Perez Estaun, A., Juhlin, C., Ayarza, P., Kashubin, A., Azor, A., Martinez Poyatos, D., Almodovar, G. R., Pascual, E., Saez, R., and Exposito, I. (2003). Crustal structure of the transpressional Variscan orogen of SW Iberia: SW Iberia deep seismic reflection profile (IBERSEIS). Tectonics, vol. 2, no. 6, 1062, doi:10.1029/2002TC001479.

File list:
Descripcion_ficheros_IBERSEIS NI_dataset.xlsx 	(List of the files included in this dataset)
Index card_IBERSEIS NI.pdf 	(Index card summarizing the main characteristics of the dataset)
IBERSEIS_ SGY_raw	(Raw seismic data in SGY format)
*.sgy 		(SGY files with the geometry information in the headers)