An evaporite-bearing accretionary complex in the northern front of the Betic-Rif orogen
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Título: | An evaporite-bearing accretionary complex in the northern front of the Betic-Rif orogen |
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Autor/es: | Pérez-Valera, Fernando | Sánchez-Gómez, Mario | Pérez López, Alberto | Pérez-Valera, Luis Alfonso |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambiente |
Palabras clave: | Evaporite-bearing | Accretionary complex | Betic-Rif orogen |
Área/s de conocimiento: | Estratigrafía |
Fecha de publicación: | jun-2017 |
Editor: | AGU Publications |
Cita bibliográfica: | Tectonics. 2017, 36(6): 1006-1036. doi:10.1002/2016TC004414 |
Resumen: | The Guadalquivir Accretionary Complex forms a largely oblique prism at the northern edge of the Betic-Rif orogen, where Miocene sediments plus allochthonous evaporite-bearing units were accreted during the displacement of the Alborán Domain toward the west. Traditional interpretations end the tectonic structuring of the Betic Cordillera at the present topographic front, beyond which gravitational and/or diapiric processes would predominate. However, this study shows pervasive tectonic deformation in the outer prism with coherent oblique shortening kinematics, which is achieved through an alternation of roughly N-S arcuate thrust systems connected by E-W transfer fault zones. These structures accord well with the geophysical models that propose westward rollback subduction. The main stage of tectonic activity occurred in the early-middle Miocene, but deformation lasted until the Quaternary with the same kinematics. Evaporite rocks played a leading role in the deformation as evidenced by the suite of ductile structures in gypsum distributed throughout the area. S- and L- gypsum tectonites, scaly clay fabrics, and brittle fabrics coexist and consistently indicate westward motion (top to 290°), with subordinate N-S contraction almost perpendicular to the transfer zones. This work reveals ductile tectonic fabrics in gypsum as a valuable tool to elucidate the structure and deformational history of complex tectonic mélanges involving evaporites above the décollement level of accretionary wedges. |
Patrocinador/es: | This study was supported by research projects CGL2012-33281 and CGL2013-46368-P (Secretaría de Estado de I+D+I, Spain), CeacTierra-Universidad de Jaén, RNM-0451 (Junta de Andalucía), and by the Junta de Andalucía Research Groups RNM 208, 325, and 370. |
URI: | http://hdl.handle.net/10045/68888 |
ISSN: | 0278-7407 (Print) | 1944-9194 (Online) |
DOI: | 10.1002/2016TC004414 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2017. American Geophysical Union |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1002/2016TC004414 |
Aparece en las colecciones: | Personal Investigador sin Adscripción a Grupo |
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Archivo | Descripción | Tamaño | Formato | |
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2017_Perez-Valera_etal_Tectonics_final.pdf | 14,82 MB | Adobe PDF | Abrir Vista previa | |
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