Intracratonic asthenosphere upwelling and lithosphere rejuvenation beneath the Hoggar swell (Algeria): Evidence from HIMU metasomatised lherzolite mantle xenoliths

Beccaluva, Luigi; Azzouni-Sekkal, Abla; Benhallou, Amel; Bianchini, Gianluca; Ellam, Rob M.; Marzola, Marina; Siena, Franca; Stuart, Finlay M.

doi:10.1016/j.epsl.2007.05.047

Cited by 57 publications

(48 citation statements)

References 43 publications

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“…Note that these Al-rich spinel compositions resemble those reported in WAN xenoliths by Wadsworth (1982-1983). Lherzolite mantle xenoliths from Hoggar (Algeria) (Beccaluva et al 2007) also display similarities (two parageneses) with Gharyan xenoliths but record a wider range of mineral compositions with Fo 89.1-91.3 olivine, Wo 38.4-47.7 clinopyroxene (Fig. 4), orthopyroxene and spinel.…”

Section: Peridotite Xenolithmentioning

confidence: 95%

“…W9, crosses: clinopyroxene from lherzolite in WAN lavas Wadsworth 1982-1983). Compositional fields of clinopyroxene from Gharyan lherzolites (solid outline) (Beccaluva et al 2008), from Hoggar lherzolites (dashed outline) (Beccaluva et al 2007) and from Batoke volcano cumulative peridotites, Cameroon (dotted outline) (Wandji et al 2009). W1: compositional fields of ferro-aluminous diopside from the Noun Plain basanites and alkali basalts, Cameroon (dashed outline) (Wandji et al 2000) and from various localities (dashed-dotted outline) (compiled in Deer et al 1978).…”

Section: Fe-ti Oxides and Spinelmentioning

confidence: 99%

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Miocene to recent alkaline volcanism between Al Haruj and Waw an Namous (southern Libya)

Bardintzeff

Deniel

Guillou

et al. 2011

Int J Earth Sci (Geol Rundsch)

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International audienceUnspiked K-Ar ages, petrological, geochemical and isotopic data are reported on samples from southern Libya (Wan an Namous--Al Haruj area). The Wan an Namous intracaldera cone dated at 0.2 Ma consists of unusually undersaturated foidite, representing the most extreme compositions among Libyan and Tibestian lavas. A basanitic and a basaltic lava flow located north-west of Wan an Namous, and probably belonging to the Al Haruj volcanic field, were dated at 5.1 Ma and 8.1 Ma. These data extend the range of ages previously reported for Al Haruj lavas. REE and multi-element patterns are typical of alkaline intraplate magmas. Sr ratios range from 0.70314 to 0.70812, whereas Nd ratios are very homogeneous (0.51290-0.51293). Pb ratios (19.231 < 206Pb/204Pb < 19.547, 15.607 < 207Pb/204Pb < 15.641 and 38.859 < 208Pb/204Pb < 39.242) are typical of HIMU-FOZO compositions. Such isotope characteristics are very similar to those available on two Gharyan (northern Libya) lavas and largely overlap those of Hoggar and Cameroon Line alkaline rocks. These lavas were produced by low and variable degrees of partial melting of a garnet- and amphibole-bearing mantle source, constraining the depth of melting between 80 and 150 km. Crustal contamination was also probably involved for the oldest sample. Mineral compositions of a dunite-harzburgite xenolith clearly indicate that the lithospheric mantle was affected by partial melting and metasomatic processes by magmatic liquids, probably associated with the genesis of Cenozoic lavas. Lithospheric delamination and asthenospheric upwelling, due to the reactivation of lithospheric megastructures induced by the Africa-Europe convergence, could represent a model for the genesis of Libyan lavas, as in Hoggar

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Section: Peridotite Xenolithmentioning

confidence: 95%

Section: Fe-ti Oxides and Spinelmentioning

confidence: 99%

Miocene to recent alkaline volcanism between Al Haruj and Waw an Namous (southern Libya)

Bardintzeff

Deniel

Guillou

et al. 2011

Int J Earth Sci (Geol Rundsch)

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“…However, these ratios can be calculated for a number of additional SCLM portions (Stolz and Davies, 1988;Pearson et al, 1993;Hauri et al, 1994;Baker et al, 1998;Brandon et al, 1999;Mukasa and Shervais, 1999;Ionov et al, 2002;Witt-Eickschen et al, 2003, Fig. 1;Becculuva et al, 2007;Shaw et al, 2007). Several of these publications dealt with samples that also have extreme l, x and j similar to the Middle Atlas SCLM (e.g., Hoggar intra-plate volcanic field, southern French Massif Central, Becculuva et al, 2007;Wittig et al, 2007).…”

Section: Prevalence and Persistence Of Elevated L And X Sclm Clinopyrmentioning

confidence: 99%

Tracing the metasomatic and magmatic evolution of continental mantle roots with Sr, Nd, Hf and and Pb isotopes: A case study of Middle Atlas (Morocco) peridotite xenoliths

Wittig

Pearson

Duggen

et al. 2010

Geochimica et Cosmochimica Acta

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“…C: Furnes et al (1986), Ionov et al (2002). D: Beccaluva et al (2007). E: Lee et al (1996), Caldeira and Munhá (2002), Nkouandou andTemdjim (2011), Temdjim (2012), Pintér et al (2015); filled symbols: continental Cameroon Line; empty symbols: oceanic Cameroon Line.…”

Section: Other European Xenolith Localitiesmentioning

confidence: 99%

The role of melt depletion versus refertilization in the major element chemistry of four-phase spinel peridotite xenoliths

Embey-Isztin

2016

Central European Geology

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Mantle peridotites are interpreted as either residues after partial melting and melt extraction or products of igneous refertilization of refractory peridotites. The simple distinction between these models is difficult to assess because in chemical variation diagrams, both processes lead essentially to the same results. The only exception is the Ti-in-Cpx versus Ti-in-whole-rock plots, which can successfully discriminate between these models. In this study, a modified version of Ti-in-Cpx versus Mg#-in-olivine plots was applied to ∼1,500 spinel peridotite xenoliths from worldwide localities. The results showed that the vast majority of shallow mantle samples are consistent with the partial melting model; however, a minority of samples may indicate refertilization of formerly refractory mantle domains.

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Intracratonic asthenosphere upwelling and lithosphere rejuvenation beneath the Hoggar swell (Algeria): Evidence from HIMU metasomatised lherzolite mantle xenoliths

Cited by 57 publications

References 43 publications

Miocene to recent alkaline volcanism between Al Haruj and Waw an Namous (southern Libya)

Miocene to recent alkaline volcanism between Al Haruj and Waw an Namous (southern Libya)

Tracing the metasomatic and magmatic evolution of continental mantle roots with Sr, Nd, Hf and and Pb isotopes: A case study of Middle Atlas (Morocco) peridotite xenoliths

The role of melt depletion versus refertilization in the major element chemistry of four-phase spinel peridotite xenoliths

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