Magmatic evolution of the Alboran region: The role of subduction in forming the western Mediterranean and causing the Messinian Salinity Crisis

Duggen, Svend; Hoernle, Kaj; Bogaard, Paul van den; Harris, Chris

doi:10.1016/s0012-821x(03)00632-0

Cited by 264 publications

(382 citation statements)

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“…From a petrologic point of view, four types of volcanic rocks can be distinguished in the south-eastern Betic region: (1) calk-alkaline volcanics, (2) potassic calk-alkaline and shoshonitic volcanics, (3) lamproitic volcanics, and (4) basaltic-alkaline volcanics (Araña and Vegas, 1974;López Ruiz and Rodríguez Badiola, 1980;Bellon et al, 1983) Bellon et al (1983); (2) Nobel et al (1981); (3) Duggen et al (2005); (4) Kuiper et al (2006). PMAG: Paleomagnetic results obtained from paleomagnetic experiments (from Calvo et al, 1994Calvo et al, , 1997 1983; Nobel et al, 1981;Di Battistini et al, 1987;Duggen et al, 2004Duggen et al, , 2005Kuiper et al, 2006). A detailed description of the petrology of south-east Iberian Neogene volcanism can be found, for example, in Duggen et al (2005).…”

Section: Geological Setting and Samplingmentioning

confidence: 99%

A paleointensity study on middle Miocene to Pliocene volcanic rocks from south-eastern Spain

2009

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Thirteen middle-Miocene to Pliocene volcanic sites, belonging to four different types of volcanism (calcalkaline volcanism, potassic calc-alkaline and shoshonitic volcanism, lamproitic volcanism and basaltic alkaline volcanism), have been sampled in south-eastern Spain for paleointensity determinations. Rock-magnetic studies yield low-Ti titanomagnetite as the main carrier of remanence, showing also the presence of titanohematites in several cases. Analysis of hysteresis parameters indicates a PSD domain structure. Paleointensity determinations were performed with the Coe (1967) method. Of the 90 paleointensity determinations carried out, 29 provide successful determinations which fulfil selection criteria; most of these were in samples of lamproitic volcanism. Only four lamproitic sites out of the 13 studied ones yield reliable results. All have a similar age of approximately 7 M.y. Virtual dipole moments (VDM) of three of these display values between approximately 4·10 22 A m 2 and 8·10 22 A m 2 , thus providing new paleointensity data for a time interval (between 4 and 8 M.a.), with a lack of Thellier-type paleointensity determinations. The fourth site shows a much lower paleointensity of 1.6·10 22 A m 2 , and may correspond to a polarity transition, in accordance with its paleo-directional results.

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Section: Geological Setting and Samplingmentioning

confidence: 99%

A paleointensity study on middle Miocene to Pliocene volcanic rocks from south-eastern Spain

2009

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“…Several theories have been put forward: delamination of subducted continental mantle lithosphere (e.g. Seber et al 1996;Calvert et al 2000;Duggen et al 2004), an active continental subduction (e.g. Morales et al 1999) and/or active oceanic subduction (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Gutscher et al 2002); processes related to the evolution of the western Mediterranean subduction system, such as retreat and tearing of the subducted oceanic slab (e.g. Lonergan & White 1997;Duggen et al 2004;Faccenna et al 2004); a continental scale thermal mantle source (e.g. Hoernle et al 1995); and convective removal or gravitational collapse of thickened continental lithosphere (e.g.…”

Section: Introductionmentioning

confidence: 99%

Crustal thickness and images of the lithospheric discontinuities in the Gibraltar arc and surrounding areas

Mancilla

Stich

Morales

et al. 2015

Geophysical Journal International

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S U M M A R YThe Gibraltar arc and surrounding areas are a complex tectonic region and its tectonic evolution since Miocene is still under debate. Knowledge of its lithospheric structure will help to understand the mechanisms that produced extension and westward motion of the Alboran domain, simultaneously with NW-SE compression driven by Africa-Europe plates convergence. We perform a P-wave receiver function analysis in which we analyse new data recorded at 83 permanent and temporary seismic broad-band stations located in the South of the Iberian peninsula. These data are stacked and combined with data from a previous study in northern Morocco to build maps of thickness and average v P /v S ratio for the crust, and cross-sections to image the lithospheric discontinuities beneath the Gibraltar arc, the Betic and Rif Ranges and their Iberian and Moroccan forelands. Crustal thickness values show strong lateral variations in the southern Iberia peninsula, ranging from ∼19 to ∼46 km. The Variscan foreland is characterized by a relatively flat Moho at ∼31 km depth, and an average v P /v S ratio of ∼1.72, similar to other Variscan terranes, which may indicate that part of the lower crustal orogenic root was lost. The thickest crust is found at the contact between the Alboran domain and the External Zones of the Betic Range, while crustal thinning is observed southeastern Iberia (down to 19 km) and in the Guadalquivir basin where the thinning at the Iberian paleomargin could be still preserved. In the cross-sections, we see a strong change between the eastern Betics, where the Iberian crust underthrusts and couples to the Alboran crust, and the western Betics, where the underthrusting Iberian crust becomes partially delaminated and enters into the mantle. The structures largely mirror those on the Moroccan side where a similar detachment was observed in northern Morocco. We attribute a relatively shallow strong negativepolarity discontinuity to the lithosphere-asthenosphere boundary. This means relatively thin lithosphere ranging from ∼50 km thickness in southeastern Iberia and northeastern Morocco to ∼90-100 km beneath the western Betics and the Rif, with abrupt changes of ∼30 km under the central Betics and northern Morocco. Our observations support a geodynamic scenario where in western Betics oceanic subduction has developed into ongoing continental subduction/delamination while in eastern Betics this process is inactive.

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“…1). The subduction started in the Late Miocene in the SE of the Iberian Peninsula (Duggen et al, 2004(Duggen et al, , 2005, and then migrated westward (Faccenna et al, 2004 and references therein). This time linkage implies necessarily that the volcanism of the CVP occurred inside a NW-directed, generalized compressive regime which resulted in the stress transmission from the foreland fold-and-thrust belt of the External Betics, the external zone of the Betic Orogen in southern Spain (Fig.…”

Section: Baby-plume Hypothesismentioning

confidence: 99%

“…In our case study, this hypothesis has the following elements ( Fig. 13): -The Late Miocene tectonic setting when the volcanism occurred in the CVP consists of a NW-directed subduction of the intermediate Alboran Terrane under the south Iberian margin, yielding the magmatism in the SE of the Iberian Peninsula (Duggen et al, 2004(Duggen et al, , 2005SESVP in Fig. 13).…”

Section: Baby-plume Hypothesismentioning

confidence: 99%

Gravity modeling of the lithosphere in the Calatrava Volcanic Province (Spain): geodynamic implications.

Granja-Bruña

Vegas²,

Domingo

et al. 2015

Journal of Iberian Geology

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(M.A.S.D.); amunoz@ucm.es (A.M.M.); ssainz-maza@fomento.es (S.S.M.A)Received: 12 January 2015 / Accepted: 5 July 2015 / Available online: 20 July 2015 AbstractThe origin of the intraplate volcanism in the Calatrava Volcanic Province (CVP) is controversial. On the basis of its geochemical signature, it has been ascribed to an "aborted" rift, implying lithospheric thinning. However, the volcanism occurred during the generalized Cenozoic NW−SE-oriented compressive tectonic regime. On the other hand, on the basis of evidence for its deep-seated origin, it has been linked to the existence of a baby-plume detached from an active megaplume below the Canary-Azores Islands and the western Mediterranean. In order to understand better the aforementioned geodynamic scenarios for the origin of the CVP, we address here the study of the lithosphere in the CVP and its vicinity by means of gravity analysis and 2+1/2D modeling. Gravity modeling results do not support the rifting model adopted for the intraplate volcanism occurred in the CVP because the crust shows a quasi-constant thickness. Density models suggest the existence of a sub-crustal, anomalous low-density block that could be underplated magmatic material at the base of the crust, suggesting that only a minor part of it intruded up into the crust and erupted. The localized magmatism of the CVP can be related to the combination of two factors: active, the gentle folding of the Iberian lithosphere and associated uplifting of the Variscan basement due to the NW-directed transmission of compressive stresses in the upper plate yielded by the subduction/collision in the south Iberian margin. The formation of the lithospheric folding in the Calatrava region results in a decrease of the pressure beneath the swell of the antiform that is likely to bring about basaltic magmatism below the swell; and one passive, the existence of a Variscan right-lateral shear band, which yields a weakened crust that facilitates the ascent of the magmatic materials. The relatively small volume, but large extension, of the volcanic outcrops could be associated with the preferential ascent of the magmas along the weakened crust of this NW−SE-trending Variscan shear band.Keywords: Calatrava, intraplate volcanism, gravity modeling, lithosphere structure, upward continuation Resumen El origen del volcanismo intraplaca en la Provincia Volcánica de Calatrava (CVP) es controvertido. En base a su signatura geoquímica se ha atribuido a la formación de un rift "abortado", implicando un adelgazamiento litosférico. Sin embargo, el volcanismo se desarrolló durante un régimen tectónico compresivo orientado NW-SE que fue generalizado en la región de Calatrava durante el Cenozoico. Por otro lado, en base a las evidencias de su origen profundo, se le ha relacionado con la existencia de una mini-pluma desconectada de una mega-pluma activa debajo de los archipiélagos de Canarias y Azores, y en el Mediterráneo occidental. Con el propósito de contribuir a la discriminación entre los escenarios geodinámicos mencionados...

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Magmatic evolution of the Alboran region: The role of subduction in forming the western Mediterranean and causing the Messinian Salinity Crisis

Cited by 264 publications

References 55 publications

A paleointensity study on middle Miocene to Pliocene volcanic rocks from south-eastern Spain

A paleointensity study on middle Miocene to Pliocene volcanic rocks from south-eastern Spain

Crustal thickness and images of the lithospheric discontinuities in the Gibraltar arc and surrounding areas

Gravity modeling of the lithosphere in the Calatrava Volcanic Province (Spain): geodynamic implications.

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