A Permian underplating event in late- to post-orogenic tectonic setting. Evidence from the mafic–ultramafic layered xenoliths from Beaunit (French Massif Central)

Féménias, Olivier; Coussaert, Nicolas; Bingen, Bernard; Whitehouse, Martin J.; Mercier, J.; Demaiffe, Daniel

doi:10.1016/s0009-2541(03)00124-4

Cited by 57 publications

(21 citation statements)

References 58 publications

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“…Scarce pyroxenites from Puy Beau nit (French Massif Central, FMC) have been explained as segregates from melts unrelated to their Tertiary alkaline hosts; a possib le linkage with granulites of the lower crust is mentioned (Downes and Dupuy,1 987). They have been recently related to a Permian underplating event in the upper mantle-lower crust boundary (Femenias et al ., 2003). The latter suggestion is also invoked for the much more abundant pyroxenites described from Permian alkaline dykes from Northern Scotland (Downes et al ., 2001 ;Upton et al ., 2001 ), where granulites show geochemical similarities to pyroxe nites and it has been proposed that these xenoliths form ed by underplating as cumulates cogenetic with mafic granulites.…”

Section: He Terogeneous Mantle In Central Sp Ainmentioning

confidence: 99%

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Geochemistry of pyroxenitic and hornblenditic xenoliths in alkaline lamprophyres from the Spanish Central System

García

Villaseca

Paterson

2006

Lithos

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The alkaline lamprophyres and diabases of the Spanish Central System carry a heterogeneous suite of xenoliths which includes scarce pyroxenitic and hornblenditic types that can be divided in two groups: (a) pyroxenite xenoliths, including spinel clinopyroxenites and spinel websterites with granoblastic textures, and (b) hornblende-bearing clinopyroxenites and hornblen dites (here after called hornblenditic xenoliths) characterised by the presence of Ti-rich kaersutitic amphibole and magmatic textures, Both groups of xenoliths can be assigned to the Al-augite series of Wilshire and Shervais (1975) xenolith suite has a very homogeneous isotopic composition, close to the isotopically depleted values of high ENd and low 87 Sr/ 86 Sr ratios of one of the pyroxenite xenoliths, Some of these ultramafic xenoliths fall within the isotopic compositional range of their host alkaline dykes, which also define a bipolar compositional field, suggesting that most of them are cogenetic with the lamprophyres, P-T estimates yield temperatures in the range of 970-1 080 °c and pressures mainly from 0,9 to 1,2 GPa for pyroxenites, whilst hornblenditic xenoliths give lower (and probably underestimated) pressures (0,7-0,9 GPa), This pressure range is in agreement with pyroxenites being fonned by an underplating event at the upper mantle-lower crust boundary, whereas pressure estimates for hornblenditic xenoliths suggest equilibration within the lower crust

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Section: He Terogeneous Mantle In Central Sp Ainmentioning

confidence: 99%

“…In the FMC, these Permian ultramaf ic xenoliths are interpreted as cumulates derived from a caIcalkaline underplating event, spatially controlled by post-collisional transtensional tectonics in a within plate continental setting (Femenias et al ., 2003).…”

Section: He Terogeneous Mantle In Central Sp Ainmentioning

confidence: 99%

Geochemistry of pyroxenitic and hornblenditic xenoliths in alkaline lamprophyres from the Spanish Central System

García

Villaseca

Paterson

2006

Lithos

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“…progressively decreases from peridotite (0.85-0.82) to orthopyroxenite (0.80), anorthosite (0.80-0.76), and gabbroic rocks (0.81-0.73). Olivine and orthopyroxene compositions are well correlated in those rocks where they coexist, suggesting that they were in equilibrium (Féménias et al, 2003).…”

Section: Orthopyroxenementioning

confidence: 94%

Petrology and Geochemistry of Mafic-Ultramafic Fragments from the Aguablanca Ni-Cu Ore Breccia, Southwest Spain

Piña¹,

Hernández²,

Menor³

et al. 2006

Economic Geology

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“…Some trace elements (Ni, Cu, Zn, V and Sr) were measured by X-ray fluorescence spectrometry on pressed powder pellets (Bologne and Duchesne 1991). Other trace elements (Rb, Cs, Ba, Zr, Hf, Nb, Ta, U, Th, Pb, Y and the rare earth elements, REEs) were analysed by ICP-MS, also at the ''Collectif de Géochimie instrumentale'', using the analytical procedure described by Vander and detailed in Féménias et al (2003). The whole-rock geochemical data are reported in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…In that sense, the high-K Motru Dyke Swarm suite could be the geodynamic marker of a thin continental crust that resulted from the late-to post-orogenic extension of the Danubian area. It has been suggested by several authors (e.g., Rogers et al 1987;Thirwall 1988;Sloman 1989;Féménias et al 2003) that geochemical features of old calc-alkaline volcanic suites could be related to chemical heterogeneities generated in the mantle during trace element enrichment events (metasomatism), in relation with a subduction episode, and that this enrichment could last for substantial periods of time after cessation of subduction.…”

Section: Parental Magma Source and Tectonic Implicationsmentioning

confidence: 99%

Nature and significance of a Cambro-Ordovician high-K, calc-alkaline sub-volcanic suite: the late- to post-orogenic Motru Dyke Swarm (Southern Carpathians, Romania)

Féménias¹,

Berza²,

Tatu³

et al. 2007

Int J Earth Sci (Geol Rundsch)

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The Motru Dyke Swarm intrudes the Precambrian Danubian basement of the Southern Carpathians (Romania). It is a marker of a sub-volcanic event that occurred during the early Palaeozoic (Cambrian to Ordovician). The geographical distribution of dykes on ã 2,000 km 2 area is heterogeneous; several areas of high dyke density have been the subject of a detailed petrological and geochemical study. Taken altogether, the 150 samples define a single complete magmatic series, from basaltic andesite to rhyolite. Whole-rock major element variations show a medium-to high-K, calc-alkaline magmatic suite. The compositional variations and the general decrease of trace element contents (both compatible and incompatible, including REEs) from basaltic andesite to rhyolite are consistent with 1) the fractionation of the observed phenocryst assemblages, Ca-amphibole (Tipargasite to magnesiohornblende) followed by intermediate plagioclase, clinopyroxene and accessory biotite and quartz and 2) the absence of lower and/or upper crustal contamination. Trace elements diagrams display typical arc patterns (LILE, Pb and LREE enrichment and relative depletion in Nb-Ta, Zr-Hf and Ti). The Th/U, Nb/Ta and Zr/Hf ratios are constant and close to the mantle values throughout the whole series, which argues that the parental magma was generated from a single and homogeneous enriched lithospheric mantle source. The field regional evidence implies that melting occurred during a late-to post-orogenic period of lithospheric extension, and thus took place quite lately after the cessation of Pan-African subduction.

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A Permian underplating event in late- to post-orogenic tectonic setting. Evidence from the mafic–ultramafic layered xenoliths from Beaunit (French Massif Central)

Cited by 57 publications

References 58 publications

Geochemistry of pyroxenitic and hornblenditic xenoliths in alkaline lamprophyres from the Spanish Central System

Geochemistry of pyroxenitic and hornblenditic xenoliths in alkaline lamprophyres from the Spanish Central System

Petrology and Geochemistry of Mafic-Ultramafic Fragments from the Aguablanca Ni-Cu Ore Breccia, Southwest Spain

Nature and significance of a Cambro-Ordovician high-K, calc-alkaline sub-volcanic suite: the late- to post-orogenic Motru Dyke Swarm (Southern Carpathians, Romania)

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