Plio-Quaternary strike-slip tectonics in the Central Mallorca Depression, Balearic Promontory: Land–sea correlation

Type Article
Date 2022-04
Language English
Author(s) Maillard Agnès1, Raad Fadl2, Chanier Frank3, Heida Hanneke4, Lofi Johanna2, Mas Guillem5, Garcia-Castellanos Daniel4
Affiliation(s) 1 : Géosciences Environnement Toulouse (GET), Observatoire Midi-Pyrénées, Université de Toulouse, CNRS, IRD, UMR 5563, 14 Avenue E. Belin, F31400 Toulouse, France
2 : Géosciences Montpellier, CNRS, Université de Montpellier, Université des Antilles - Bâtiment 22, Université de Montpellier, Place E. Bataillon, 34095 Montpellier Cedex 05, France
3 : Univ. Lille, CNRS, Univ. Littoral Côte d'Opale, UMR 8187, LOG, Laboratoire d'Océanologie et de Géosciences, F 59000 Lille, France
4 : Geosciences Barcelona (GEO3BCN-CSIC), Barcelona, Solé i Sabarís s/n, 08028 Barcelona, Spain
5 : Universitat de les Illes Balears (UIB), Carretera de Valldemossa, 07122 Palma, Mallorca, Spain
Source Tectonophysics (0040-1951) (Elsevier BV), 2022-04 , Vol. 829 , P. 229295 (23p.)
DOI 10.1016/j.tecto.2022.229295
WOS© Times Cited 2
Keyword(s) Central Mallorca Depression, Balearic Promontory, Strike-slip corridors, Structural inheritance, Earthquakes

The Balearic Promontory (Spain) is of key importance to understand the tectonic kinematics of the westernmost Mediterranean, because its continued marine sedimentation has recorded the contrasting effects expected from competing geodynamic models proposed for the region. Near the center of this promontory, between the islands of Mallorca and Ibiza, the Miocene to Pleistocene stratigraphy of the Central Mallorca Depression presents an ideal record of the tectonic deformation that has received only limited attention. We use a widespread dataset of 2D seismic reflection profiles to identify, interpret and map the main prominent reflectors and extrapolate the thickness of the pre-Messinian and Pliocene-Quaternary sedimentary units. We then quantify the timing and style of deformation related to the various fault systems. Our results reveal for the first time a series of aligned small depressions bounded by extensional and strike-slip faults and filled with Plio-Quaternary sediment, perfectly aligned with the sub-basins of the onshore Mallorca Graben. A subsidence analysis confirms this correlation. We identify non-cylindrical deformation within the Plio-Quaternary unit that is remarkably similar to that observed onshore, suggesting continuous fault zones from the Central Mallorca Depression to Mallorca Island. We interpret an intra-PQ unconformity as the marker of a transition from extensional to strike-slip tectonic regime. The strike-slip stage is represented by both transpressional and transtensional structures, interpreted as restraining/releasing bends respectively and step overs along the faults. We show that these offshore faults in the Central Mallorca Depression overlap well with seismic epicenters and suggest major active strike-slip corridors that have an onshore continuity both until eastern Mallorca and in the southwestern Ibiza margin. The role of previous tectonic inherited structures (rifting, Betic thrusts, post-orogenic collapse) on the deformation reported here is discussed and we propose a tentative sketch that integrates our results in a Miocene to Present-day evolution at regional scale.

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