Depleted arc volcanism in the Alboran Sea and shoshonitic volcanism in Morocco: geochemical and isotopic constraints on Neogene tectonic processes

Gill, R.C.O.; Aparicio, Alfredo; Azzouzi, M. El; Hernandez, Jean; Thirlwall, M. F.; Bourgois, Jacques; Marriner, G. F.

doi:10.1016/j.lithos.2004.07.002

Cited by 84 publications

(66 citation statements)

References 51 publications

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“…7). More widespread calc-alkaline to shoshonitic and ultrapotassic volcanism occurred on the southeast coast of Spain and in Northern Africa from the Early Miocene to Pliocene (Zeck 1970;1998;Nixon et al 1984;Venturelli et al 1984a;Hertogen et al 1985;Di Battistini et al 1987;Louni-Hacini et al 1995, El Bakkali et al 1998Benito et al 1999;Turner et al 1999;Coulon et al 2002;Duggen et al 2004;Gill et al 2004;Fig. 6).…”

Section: Betic-alboran-rif Province (Western Mediterranean)mentioning

confidence: 99%

“…Volcanic rocks on Alboran island and the sea floor have been dated between 11 and 7 Ma . They are mostly low-K tholeiitic rocks with clear 'subductionrelated' geochemical features Gill et al 2004;Fig. 7).…”

Section: Betic-alboran-rif Province (Western Mediterranean)mentioning

confidence: 99%

“…The models can be divided into the following groups: (1) subduction-related; (2) subduction break-off; (3) delamination of lithospheric mantle due to gravitational collapse; (4) convective removal of the lower lithosphere. Torres-Roldán et al (1986), Royden (1993), Lonergan & White (1997), Duggen et al (2003; and Gill et al (2004) assumed that contemporaneous subduction occurred with the calc-alkaline volcanism. Geophysical data indicate an east-dipping subducted slab (Gutscher et al 2002) beneath the Alboran region.…”

Section: Betic-alboran-rif Province (Western Mediterranean)mentioning

confidence: 99%

“…Geophysical data indicate an east-dipping subducted slab (Gutscher et al 2002) beneath the Alboran region. Duggen et al (2004) and Gill et al (2004) emphasized that the 'subductionrelated' nature and particularly the strong depletion in the light REE and HFSE of the Alboran tholeiites (Fig. 7) could only be explained by formation in a metasomatized mantle wedge above a subducted slab.…”

Section: Betic-alboran-rif Province (Western Mediterranean)mentioning

confidence: 99%

“…The principal reason for magma generation could be passive extension of continental lithosphere resulting in decompression melting of the lithospheric and asthenospheric mantle variably metasomatized by previous subduction processes. Another candidate for volcanism directly related to active subduction is the Late Miocene low-K tholeiitic to calc-alkaline volcanic products of the Alboran basin Gill et al 2004). However, other authors (e.g.…”

Section: Geodynamic Implicationsmentioning

confidence: 99%

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Tertiary-Quaternary subduction processes and related magmatism in the Alpine-Mediterranean region

Harangi

Downes

Seghedi³

2006

Memoirs

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Section: Betic-alboran-rif Province (Western Mediterranean)mentioning

confidence: 99%

Section: Betic-alboran-rif Province (Western Mediterranean)mentioning

confidence: 99%

Section: Betic-alboran-rif Province (Western Mediterranean)mentioning

confidence: 99%

Section: Betic-alboran-rif Province (Western Mediterranean)mentioning

confidence: 99%

Section: Geodynamic Implicationsmentioning

confidence: 99%

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Tertiary-Quaternary subduction processes and related magmatism in the Alpine-Mediterranean region

Harangi

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2006

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Finite‐frequency Rayleigh wave tomography of the western Mediterranean: Mapping its lithospheric structure

Palomeras

Thurner

Levander

et al. 2014

Geochem Geophys Geosyst

105

148

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[1] We present a 3-D shear wave velocity model for the crust and upper mantle of the western Mediterranean from Rayleigh wave tomography. We analyzed the fundamental mode in the 20-167 s period band (6.0-50.0 mHz) from earthquakes recorded by a number of temporary and permanent seismograph arrays. Using the two-plane wave method, we obtained phase velocity dispersion curves that were inverted for an isotropic Vs model that extends from the southern Iberian Massif, across the Gibraltar Arc and the Atlas mountains to the Saharan Craton. The area of the western Mediterranean that we have studied has been the site of complex subduction, slab rollback, and simultaneous compression and extension during African-European convergence since the Oligocene. The shear velocity model shows high velocities beneath the Rif from 65 km depth and beneath the Granada Basin from 70 km depth that extend beneath the Alboran Domain to more than 250 km depth, which we interpret as a near-vertical slab dangling from beneath the western Alboran Sea. The slab appears to be attached to the crust beneath the Rif and possibly beneath the Granada Basin and Sierra Nevada where low shear velocities (3.8 km/s) are mapped to >55 km depth. The attached slab is pulling down the Gibraltar Arc crust, thickening it, and removing the continental margin lithospheric mantle beneath both Iberia and Morocco as it descends into the deeper mantle. Thin lithosphere is indicated by very low upper mantle velocities beneath the Alboran Sea, above and east of the dangling slab and beneath the Cenozoic volcanics.

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

et al. 2015

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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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Depleted arc volcanism in the Alboran Sea and shoshonitic volcanism in Morocco: geochemical and isotopic constraints on Neogene tectonic processes

Cited by 84 publications

References 51 publications

Tertiary-Quaternary subduction processes and related magmatism in the Alpine-Mediterranean region

Tertiary-Quaternary subduction processes and related magmatism in the Alpine-Mediterranean region

Finite‐frequency Rayleigh wave tomography of the western Mediterranean: Mapping its lithospheric structure

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

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