Kerguelen basic and ultrabasic xenoliths: Evidence for long-lived Kerguelen hotspot activity

Mattielli, Nadine; Weis, Dominique; Grégoire, Marilaure; Mennessier, J.P.; Cottin, Jean-Yves; Giret, A.

doi:10.1016/0024-4937(95)00040-2

Cited by 34 publications

(30 citation statements)

References 33 publications

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“…The Pb isotopic characteristics of the VVP xenoliths show similarities to those of xenoliths from Hungary and Romania (Rosenbaum et al, 1997) (Fig. 7b), the VVP xenoliths define a parallel trend but at higher 207 Pb/ 204 Pb for similar 206 Pb/ 204 Pb ratios to the subhorizontal field of ultramafic xenoliths from Canary and Kerguelen Islands (Whitehouse and Neumann, 1995;Mattielli et al, 1996;Fig. 7b (Fig.…”

Section: Isotopic Compositionmentioning

confidence: 66%

“…7e). (French Massif Central: Downes and Dupuy, 1987;Zangana et al, 1997;Downes et al, 2003;Germany-Hessian Depression: Kramm and Wedepohl, 1990;Hungary and Romania: Downes et al, 1992;Vaselli et al, 1995;Rosenbaum et al, 1997;Vulture: Downes et al, 2002;Australia: McDonough and McCulloch, 1987;Griffin et al, 1988;China: Song and Frey, 1989;Tatsumoto et al, 1992;Canary Islands: Whitehouse and Neumann, 1995;Kerguelen Islands: Mattielli et al, 1996;Philippines: Vidal et al, 1989;Maury et al, 1992;Japan: Ikeda et al, 2001 (Whitehouse and Neumann, 1995;Mattielli et al, 1996), Hungary and Romania (Rosenbaum et al, 1997), China (Tatsumoto et al, 1992) and Canada (Yukon;Carignan et al, 1996) Macera et al, 2003. Symbols are the same as in Fig.…”

Section: Isotopic Compositionmentioning

confidence: 99%

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Ultramafic xenoliths from the Veneto Volcanic Province (Italy): Petrological and geochemical evidence for multiple metasomatism of the SE Alps mantle lithosphere

et al. 2006

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Petrologic and geochemical characteristics of whole rocks and minerals may be explained by metasomatism of the local mantle lithosphere induced by both alkaline magmas upwelling to the surface (OIB-like mantle diapirism) and interaction with slab-derived material. In comparison with the geochemistry of xenoliths carried by alkaline magmas in typical withinplate tectonic environments, the Veneto xenoliths record a major heterogeneity of the local lithosphere. This appears to be related to a geodynamic scenario that was previously dominated by active continental collision, in which plume-like magmatism subsequently manifested itself.

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Section: Isotopic Compositionmentioning

confidence: 66%

Section: Isotopic Compositionmentioning

confidence: 99%

Ultramafic xenoliths from the Veneto Volcanic Province (Italy): Petrological and geochemical evidence for multiple metasomatism of the SE Alps mantle lithosphere

et al. 2006

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“…The Sr and Nd isotopic compositions ofclinopyroxene from peridotites of this study and clinopyroxene data from Mattielli et al 1996 andMattielli et a!. 1999 Samples OB93-5 1 and 0B93-83 were identified as being metasomatized by carbonatitic melts.…”

Section: Isotopic Compositions Of Sr Nd and Osmentioning

confidence: 58%

“…This study expands on the previous major and trace element and petrographic work of and the isotopic study of Mattielli et al 1996 and, all of which concentrated on the xenoliths from localities in the southeastern province of the Islands. The xenoliths of this study are from the Lac Superieur location to the north on the Courbet Peninsula Figure 1-1.…”

Section: Figuresmentioning

confidence: 83%

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Plume-lithosphere interaction : geochemical evidence from upper mantle and lower crusal Xenoliths from the Kerguelen Islands

Hassler¹

1999

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This study is a geochemical investigation ofthe evolution of the Kerguelen plume, on the basis ofupper mantle and lower crustal xenoliths. Ultramafic xenoliths include harzburgites predominant, a lherzolite, dunites and pyroxenites, whereas lower crustal xenoliths are cumulate gabbros recrystallized under granulite facies conditions. On the basis of the whole rock major element characteristics and trace element abundance patterns in clinopyroxenes, the harzburgites were found to be residues of extensive melting at high pressures within the Kerguelen plume. These were then recrystallized at low pressures and metasomatized by plume generated melts. Details ofthe metasomatic process were determined from trace element variations in clinopyroxene in connection to texture. This demonstrated that meltrock reaction and the precipitation ofnew clinopyroxenes occurred by metasomatic carbonatitic melts.It was also found that some ofthe harzburgites had distinctly unradiogenic Os isotopic compositions and were identified as originating from the sub-Gondwanaland lithosphere. On the basis of major and trace element compositions, the granulite xenoliths were found to be originally gabbroic cumulates formed from plume-derivedbasaltic melts emplaced at the base of the crust by underplating and subsequently recrystallized isobarically under granulite conditions. The Sr, Nd and Os isotopic compositions of the peridotite and granulite xenoliths demonstrate that the Kerguelen plume is isotopically heterogeneous and displays a temporal progression toward more enriched Sr and Nd isotopic compositions from the Ninetyeast Ridge to granulite xenoliths to Kerguelen basalts and Heard Island basalts. 4Acknowledgments

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Origin of primitive ocean island basalts by crustal gabbro assimilation and multiple recharge of plume‐derived melts

Borisova

Bohrson

Grégoire

2017

Geochem Geophys Geosyst

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Chemical Geodynamics relies on a paradigm that the isotopic composition of ocean island basalt (OIB) represents equilibrium with its primary mantle sources. However, the discovery of huge isotopic heterogeneity within olivine‐hosted melt inclusions in primitive basalts from Kerguelen, Iceland, Hawaii and South Pacific Polynesia islands implies open‐system behavior of OIBs, where during magma residence and transport, basaltic melts are contaminated by surrounding lithosphere. To constrain the processes of crustal assimilation by OIBs, we employed the Magma Chamber Simulator (MCS), an energy‐constrained thermodynamic model of recharge, assimilation and fractional crystallization. For a case study of the 21–19 Ma basaltic series, the most primitive series ever found among the Kerguelen OIBs, we performed sixty‐seven simulations in the pressure range from 0.2 to 1.0 GPa using compositions of olivine‐hosted melt inclusions as parental magmas, and metagabbro xenoliths from the Kerguelen Archipelago as wallrock. MCS modeling requires that the assimilant is anatectic crustal melts (P2O5 ≤ 0.4 wt.% contents) derived from the Kerguelen oceanic metagabbro wallrock. To best fit the phenocryst assemblage observed in the investigated basaltic series, recharge of relatively large masses of hydrous primitive basaltic melts (H2O = 2–3 wt%; MgO = 7–10 wt.%) into a middle crustal chamber at 0.2 to 0.3 GPa is required. Our results thus highlight the important impact that crustal gabbro assimilation and mantle recharge can have on the geochemistry of mantle‐derived olivine‐phyric OIBs. The importance of crustal assimilation affecting primitive plume‐derived basaltic melts underscores that isotopic and chemical equilibrium between ocean island basalts and associated deep plume mantle source(s) may be the exception rather than the rule.

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Kerguelen basic and ultrabasic xenoliths: Evidence for long-lived Kerguelen hotspot activity

Cited by 34 publications

References 33 publications

Ultramafic xenoliths from the Veneto Volcanic Province (Italy): Petrological and geochemical evidence for multiple metasomatism of the SE Alps mantle lithosphere

Ultramafic xenoliths from the Veneto Volcanic Province (Italy): Petrological and geochemical evidence for multiple metasomatism of the SE Alps mantle lithosphere

Plume-lithosphere interaction : geochemical evidence from upper mantle and lower crusal Xenoliths from the Kerguelen Islands

Origin of primitive ocean island basalts by crustal gabbro assimilation and multiple recharge of plume‐derived melts

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