Joints,faults and palaeostress evolution in the Campo de Dalias (Betic Cordilleras,southeastern Spain) |
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| Authors: | Carlos Mar??n Jesús Galindo-Zald??var Lu??s Roberto Rodr??guez-Fernández |
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| Institution: | 1. Instituto Geológico y Minero de España. Urb. Alcázar del Genil. Edificio Zulema, No. 4 Bajo CP, 18006 Granada, Spain;2. Departamento de Geodinámica, Universidad de Granada, 18071 Granada, Spain |
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| Abstract: | The Campo de Dal??as, located between the central and eastern Betic Cordilleras, shows an evolution determined by the overprinting of two main stress fields since Pliocene times. The first of these develops hybrid and tensional joint sets up to Pleistocene (100 000 yr) and is characterized by NNW–SSE horizontal trend of compression and an ENE–WSW horizontal extension. The second stress field has prolate to triaxial extensional ellipsoids, also with ENE–WSW horizontal extension, and continues to be active today. The most recent stresses produce the reactivation of previous joints as faults whose trends are comprised mainly from N120°E to N170°E and have a normal and transtensional regime, with dextral or sinistral components. The palaeostress evolution of this region is similar to that undergone by other basins of the Eastern Betic Cordilleras, although the Pliocene–Pleistocene transcurrent deformations in the Campo de Dal??as only develop joints and not strike-slip faults. |
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| Keywords: | Faulted joints Palaeostress Plio-Quaternary Campo de Dal??as Betic Cordillera Spain Diaclases faillées Paléocontraintes Plio-Quaternaire Campo de Dalias Cordillères bétiques Espagne |
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