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Compressional tectonic inversion of the Algero-Balearic basin: Latemost Miocene to present oblique convergence at the Palomares margin (Western Mediterranean)

AuthorsGiaconia, F.; Booth-Rea, Guillermo; Ranero, César R. CSIC ORCID; Gràcia, Eulàlia CSIC ORCID ; Bartolomé, Rafael CSIC ORCID ; Calahorrano, Alcinoe CSIC ORCID ; Vendrell, M. G. CSIC; Cameselle, Alejandra L. CSIC ORCID CVN; Costa, Sergio CSIC; Gómez de la Peña, L. CSIC ORCID; Martínez-Loriente, S. CSIC ORCID ; Perea, Héctor ; Viñas Gaza, Marina CSIC ORCID
Issue Date30-Jul-2015
PublisherAmerican Geophysical Union
CitationTectonics 34(7): 1516-1543 (2015)
AbstractInterpretation 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 -7Ma, coeval to inversion at the Algerian margin. Shortening at the Alboran ridge and Al-Idrisi faults occurred later, since 5Ma, indicating a westward propagation of the compressional inversion of the Western Mediterranean. ©2015. American Geophysical Union. All Rights Reserved
DescriptionGiaconia, F. ... et al.-- 28 pages, 14 figures, supporting information http://dx.doi.org/tect20290-sup-0001-supplementary.doc
Publisher version (URL)http://dx.doi.org/10.1002/2015TC003861
Identifiersdoi: 10.1002/2015TC003861
issn: 0278-7407
e-issn: 1944-9194
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