期刊
JOURNAL OF STRUCTURAL GEOLOGY
卷 115, 期 -, 页码 231-242出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsg.2018.08.001
关键词
Orogenic extension and shortening; Crustal deformations and plate kinematics; Alpujarride complex; Western Mediterranean
资金
- Spanish Ministry of Economy and Competitiveness [CGL2015-71692-P]
The Alpujarride Complex has concentrated discussion on the extent and role of orogenic extension in the Betic-Rif Orogen (westernmost Mediterranean). Structural analysis on Permo-Triassic rocks of the Alpujarride Complex is a firm basis to assess extension and to integrate it in the plate tectonic scenario. The main Alpine deformation was dominated by top-to-the-NE shearing, with rare map-scale folds; as a whole, this deformation attests ductile extension during exhumation of previously subducted rocks. Some authors have suggested that the Alpujarride Complex continued evolving extensionally since this early exhumation, but in this paper a stage of regional shortening is documented. Thus, km-scale overturned NW-vergent folds are interpreted as witnessing shortening. Subsequently, post-metamorphic low-angle faults of Burdigalian-Langhian age cut the train of folds in two ways: firstly, top-to-the-N thrusts generated stratigraphic and metamorphic superpositions; then, top-to-the-N low-angle normal faults, kinematically congruent with the thrusts, formed due to accretion at deep levels of the orogenic wedge when the Nevado-Filabride Complex underthrust the Alpujarride Complex. The shortening stage occurred at latest Oligocene early-middle Miocene and can be related to fast convergence rates between Africa and Iberia. Later, a drop in the convergent rates prompted lithospheric rollback and top-to-the-SW crustal extension since Serravallian time, coexisting with moderate orthogonal shortening that gave way to E-W trending upright folds.
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