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The role of extension in the Miocene denudation of the Nevado-Filábride Complex, Betic Cordillera (SE Spain)

Johnson, C; Harbury, N; Hurford, AJ; (1997) The role of extension in the Miocene denudation of the Nevado-Filábride Complex, Betic Cordillera (SE Spain). Tectonics , 16 (2) 189 - 204. 10.1029/96TC03289. Green open access

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Abstract

The Internal Zone of the Betic Cordillera, SE Spain, consists of a nappe stack of three complexes, the deepest of which is the Nevado-Filábride Complex. The zone is separated from the overlying Alpujárride Complex by a crustal scale shear zone that has variously been interpreted as a thrust or an extensional detachment. A suite of 74 new apatite and zircon fission track results have been obtained from the Nevado-Filábride Complex and these have been used to define regional cooling patterns for the complex. Rapid cooling (105°C–200°C Ma−1) is spatially related to the tectonic contact with the overlying Alpujárride Complex-Cooling to near-surface temperatures occurred first in the east (Sierra de los Filabres) during the mid-Serravallian (12±1 Ma) and was completed by the early Tortonian (9–8 Ma) in the west (Sierra Nevada). There is no correlation between fission track age and sample elevation. These results are consistent with tectonic unroofing of this complex, a finding that favors extension as the mechanism by which the two complexes were brought into contact. Extension spans the middle and earliest upper Miocene (12–8 Ma) in the study area and therefore lasted much longer than previously documented. A hypothesis is advanced which links oblique convergence between the Iberian plate and the Betic Internal Zones, resulting in crustal contraction at depth, with orogen parallel extension in the middle and upper crust.

Type: Article
Title: The role of extension in the Miocene denudation of the Nevado-Filábride Complex, Betic Cordillera (SE Spain)
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/96TC03289
Publisher version: http://dx.doi.org/10.1029/96TC03289
Language: English
Additional information: Copyright 1997 by the American Geophysical Union
Keywords: Fission-track thermochronology, Metamorphic core complexes, West Central Arizona, East Humboldt Range, de-los-Filabres, Southern Spain, Internal zone, Alboran Sea, Tectonic implications, Crustal extension
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/34660
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