Compressional tectonic inversion of the Algero-Balearic basin: Latemost Miocene to present oblique convergence at the Palomares margin (Western Mediterranean)
Compressional tectonic inversion of the Algero-Balearic basin: Latemost Miocene to present oblique convergence at the Palomares margin (Western Mediterranean)
Interpretation of new multichannel seismic reflection profiles indicates that the Palomares margin was formed by crustal-scale extension and coeval magmatic accretion during middle to late Miocene opening of the Algero-Balearic basin. The margin formed at the transition between thinned continental crust intruded by arc volcanism and back-arc oceanic crust. Deformation produced during the later positive inversion of the margin offshore and onshore is partitioned between ~N50°E striking reverse faults and associated folds like the Sierra Cabrera and Abubacer anticlines and N10–20°E sinistral strike-slip faults like Palomares and Terreros faults. Parametric subbottom profiles and multibeam bathymetry offshore, structural analysis, available GPS geodetic displacement data, and earthquake focal mechanisms jointly indicate that tectonic inversion of the Palomares margin is currently active. The Palomares margin shows a structural pattern comparable to the north Maghrebian margins where Africa-Eurasia plate convergence is accommodated by NE-SW reverse faults, NNW-SSE sinistral faults, and WNW-ESE dextral ones. Contractive structures at this margin contribute to the general inversion of the Western Mediterranean since ~7?Ma, coeval to inversion at the Algerian margin. Shortening at the Alboran ridge and Al-Idrisi faults occurred later, since 5?Ma, indicating a westward propagation of the compressional inversion of the Western Mediterranean.
active tectonics, tectonic inversion, Western Mediterranean, multichannel seismics, Abubacer anticline, Palomares fault zone
1516-1543
Giaconia, Flavio
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Booth-Rea, Guillermo
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Ranero, César R.
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Gràcia, Eulàlia
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Bartolome, Rafael
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Calahorrano, Alcinoe
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Lo Iacono, Claudio
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Vendrell, Montserrat G.
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Cameselle, Alejandra L.
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Costa, Sergio
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Gómez de la Peña, Laura
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Martínez-Loriente, Sara
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Perea, Hector
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Viñas, Marina
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July 2015
Giaconia, Flavio
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Booth-Rea, Guillermo
ed1ed6a0-b2ab-4a7a-8f68-203eb9fe3239
Ranero, César R.
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Gràcia, Eulàlia
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Bartolome, Rafael
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Calahorrano, Alcinoe
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Lo Iacono, Claudio
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Vendrell, Montserrat G.
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Cameselle, Alejandra L.
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Costa, Sergio
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Gómez de la Peña, Laura
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Martínez-Loriente, Sara
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Perea, Hector
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Viñas, Marina
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Giaconia, Flavio, Booth-Rea, Guillermo, Ranero, César R., Gràcia, Eulàlia, Bartolome, Rafael, Calahorrano, Alcinoe, Lo Iacono, Claudio, Vendrell, Montserrat G., Cameselle, Alejandra L., Costa, Sergio, Gómez de la Peña, Laura, Martínez-Loriente, Sara, Perea, Hector and Viñas, Marina
(2015)
Compressional tectonic inversion of the Algero-Balearic basin: Latemost Miocene to present oblique convergence at the Palomares margin (Western Mediterranean).
Tectonics, 34 (7), .
(doi:10.1002/2015TC003861).
Abstract
Interpretation of new multichannel seismic reflection profiles indicates that the Palomares margin was formed by crustal-scale extension and coeval magmatic accretion during middle to late Miocene opening of the Algero-Balearic basin. The margin formed at the transition between thinned continental crust intruded by arc volcanism and back-arc oceanic crust. Deformation produced during the later positive inversion of the margin offshore and onshore is partitioned between ~N50°E striking reverse faults and associated folds like the Sierra Cabrera and Abubacer anticlines and N10–20°E sinistral strike-slip faults like Palomares and Terreros faults. Parametric subbottom profiles and multibeam bathymetry offshore, structural analysis, available GPS geodetic displacement data, and earthquake focal mechanisms jointly indicate that tectonic inversion of the Palomares margin is currently active. The Palomares margin shows a structural pattern comparable to the north Maghrebian margins where Africa-Eurasia plate convergence is accommodated by NE-SW reverse faults, NNW-SSE sinistral faults, and WNW-ESE dextral ones. Contractive structures at this margin contribute to the general inversion of the Western Mediterranean since ~7?Ma, coeval to inversion at the Algerian margin. Shortening at the Alboran ridge and Al-Idrisi faults occurred later, since 5?Ma, indicating a westward propagation of the compressional inversion of the Western Mediterranean.
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Accepted/In Press date: 30 July 2015
Published date: July 2015
Keywords:
active tectonics, tectonic inversion, Western Mediterranean, multichannel seismics, Abubacer anticline, Palomares fault zone
Organisations:
Marine Geoscience
Identifiers
Local EPrints ID: 380035
URI: http://eprints.soton.ac.uk/id/eprint/380035
ISSN: 0278-7407
PURE UUID: a00a5260-6202-44df-8944-08d26fcc1160
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Date deposited: 04 Aug 2015 09:54
Last modified: 14 Mar 2024 20:53
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Contributors
Author:
Flavio Giaconia
Author:
Guillermo Booth-Rea
Author:
César R. Ranero
Author:
Eulàlia Gràcia
Author:
Rafael Bartolome
Author:
Alcinoe Calahorrano
Author:
Claudio Lo Iacono
Author:
Montserrat G. Vendrell
Author:
Alejandra L. Cameselle
Author:
Sergio Costa
Author:
Laura Gómez de la Peña
Author:
Sara Martínez-Loriente
Author:
Hector Perea
Author:
Marina Viñas
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