Post-Collisional Transition from Subduction- to Intraplate-type Magmatism in the Westernmost Mediterranean: Evidence for Continental-Edge Delamination of Subcontinental Lithosphere

Duggen, Svend; Hoernle, Kaj; Bogaard, Paul van den; Garbe‐Schönberg, Dieter

doi:10.1093/petrology/egi013

Cited by 469 publications

(386 citation statements)

References 105 publications

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“…Palomeras et al (2014) propose, as other authors before (e.g. Duggen et al 2005), that this thin lithosphere is a consequence of the removal of the lithospheric mantle at the continental margins beneath Iberia and north Morocco.…”

Section: A Shallow Lithosphere-asthenosphere Boundary (Lab)supporting

confidence: 66%

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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Section: A Shallow Lithosphere-asthenosphere Boundary (Lab)supporting

confidence: 66%

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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“…The incompatible trace element abundance and ratios (e.g., low Nb-Ta, high LILE/HFSE ratios, high Pb) confirm the typical subduction-related geochemical characteristics (e.g., Duggen et al, 2005;Avanzinelli et al, 2009;Lustrino et al, 2011;Fig. 10a).…”

Section: Accepted M Manuscriptmentioning

confidence: 52%

“…During the Cenozoic, a widespread igneous activity developed in the Mediterranean area, mostly within the Alpine suture zone and partially along the older Variscan suture in central Europe (e.g., Duggen et al, 2005;Harangi et al, 2006;Lustrino and Wilson, 2007;Lustrino et al, 2011;Carminati et al, 2012, and references therein). Most of the volcanological, mineralogical and geochemical features observed in the various circum-Mediterranean igneous districts are well represented in the island of Sardinia, which is thus a key-locality for magmatic and geodynamic studies on the basis of several considerations:…”

Section: Introductionmentioning

confidence: 99%

Origin and evolution of Cenozoic magmatism of Sardinia (Italy). A combined isotopic (Sr–Nd–Pb–O–Hf–Os) and petrological view

Lustrino

Fedele

Melluso

et al. 2013

Lithos

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Origin and evolution of Cenozoic magmatism of Sardinia (Italy). A combined isotopic (Sr-Nd-Pb-O-Hf-Os) and petrological view, LITHOS (2013), doi: 10.1016/j.lithos.2013.08.022 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT

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“…10a). Furthermore, the Dy/Yb ratio is an important geochemical index for distinguishing partial melting between the spinel and garnet stability fields of an amphibole-and/or phlogopite-bearing lherzolite (Duggen et al, 2005;Jiang et al, 2009). Partial melting in the garnet stability field generally leads to high Dy/Yb ratios (>2.5), whereas melting in the spinel stability field would produce melts with low Dy/Yb ratios (<1.5).…”

Section: Subduction-modified Mantle Sourcementioning

confidence: 99%

“…This genetic model has been applied to shoshonitic series rocks associated with ultrapotassic rocks, high-K calc-alkaline rocks, or even to calc-alkaline rocks (e.g., Duggen et al, 2005;Altherr et al, 2008;Avanzinelli et al, 2009;Conticelli et al, 2009a;Yang et al, 2012). On the other hand, K-rich shoshonitic magma also can be derived from partial melting of the thickened lower crust, following underplating by mantlederived magma in a post-collisional extension setting (Kuster and Harms, 1998;Jiang et al, 2002;Campbell et al, 2014;Liu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Geochronology, geochemistry and geodynamic implications of the Late Mesozoic volcanic rocks in the southern Great Xing’an Mountains, NE China

Yang

Niu

Cheng

et al. 2015

Journal of Asian Earth Sciences

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Post-Collisional Transition from Subduction- to Intraplate-type Magmatism in the Westernmost Mediterranean: Evidence for Continental-Edge Delamination of Subcontinental Lithosphere

Cited by 469 publications

References 105 publications

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

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

Origin and evolution of Cenozoic magmatism of Sardinia (Italy). A combined isotopic (Sr–Nd–Pb–O–Hf–Os) and petrological view

Geochronology, geochemistry and geodynamic implications of the Late Mesozoic volcanic rocks in the southern Great Xing’an Mountains, NE China

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