Trace Element Residence and Partitioning in Mantle Xenoliths Metasomatized by Highly Alkaline, Silicate- and Carbonate-rich Melts (Kerguelen Islands, Indian Ocean)

Grégoire, Marilaure; Moine, Bertrand; O’Reilly, Suzanne Y.; Cottin, Jean-Yves; Giret, A.

doi:10.1093/petrology/41.4.477

Cited by 195 publications

(122 citation statements)

References 72 publications

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“…All of these signatures are characteristics of carbonatite metasomatism (Dupuy et al, 1992;Rudnick et al, 1993) and suggest that the source region for these lamprophyres had been infiltrated by carbonate-rich magmas (Furman and Graham, 1999). Therefore, the observed Zr/Hf and Nb/Ta fractionations in these rocks favored a rutileand carbonate-rich metasomatic assemblage as that documented in off-cratonic and oceanic peridotite xenoliths (e.g., Ionov et al, 1999;Grégoire et al, 2000b), in good agreement with the presence of clinopyroxene, rutile and apatite exsolutions in garnet from the UHP rocks (Ye et al, 2000), which suggested that rutile and apatite might have been dissolved from the UHP eclogites and involved in the metasomatic melts during the subduction and/or exhumation of the continental slabs.…”

mentioning

confidence: 73%

Origin of early Cretaceous calc-alkaline lamprophyres from the Sulu orogen in eastern China: implications for enrichment processes beneath continental collisional belt

Guo

Wang

et al. 2004

Lithos

233

161

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confidence: 73%

Origin of early Cretaceous calc-alkaline lamprophyres from the Sulu orogen in eastern China: implications for enrichment processes beneath continental collisional belt

Guo

Wang

et al. 2004

Lithos

233

161

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“…While pyroxenite or garnet^pyroxenite veins are present in many orogenic peridotites [80,81], there may also be signi¢cant hydrous phases such as amphiboles and phlogopite because of the likely volatile enrichments in the LVZ, and because these latter phases host abundant water-soluble elements. These hydrous phases are widely observed in metasomatized lithospheric mantle [82,83], and stable in deep portions of aged oceanic lithosphere. The exact structural forms of these meta-somatized hydrous phases when subducted into the deep mantle are unknown, but their geochemical consequences when returned to the source regions of oceanic basalts are readily visualized as discussed above.…”

Section: The Composition Of Low F Melts Andmentioning

confidence: 92%

Geochemistry of near-EPR seamounts: importance of source vs. process and the origin of enriched mantle component

Niu

Regelous

Wendt

et al. 2002

Earth and Planetary Science Letters

233

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Niu and Batiza [Earth Planet. Sci. Lett. 148 (1997) 471^483] show that lavas from the seamounts on the flanks of the East Pacific Rise (EPR) between 5 ‡ and 15 ‡N vary from extremely depleted tholeiites to highly enriched alkali basalts. The extent of depletion and enrichment exceeds the known range of seafloor lavas in terms of the abundances and ratios of incompatible elements. New Sr^Nd^Pb isotope data for these lavas show variations ( 87 Sr/ 86 Sr = 0.702362^0.702951; 206 Pb/ 204 Pb = 18.080^19.325 and 143 Nd/ 144 Nd 0.512956^0.513183) larger than observed in lavas erupted on the nearby EPR axis. These isotopic ratios correlate with each other, with the abundances and ratios of incompatible elements, with the abundances of measured major elements such as MgO, CaO, Na 2 O and TiO 2 contents, and with the abundances and ratios of major elements corrected for crystal fractionation to Mg# = 0.72 (Ti 72 , Al 72 , Fe 72 , Ca 72 , Na 72 , and Ca 72 /Al 72 ). These coupled correlations and the spatial distribution of seamounts require an EPR mantle source that has long-term ( s 1 Ga) lithological heterogeneities on very small scales [Niu and Batiza, Earth Planet. Sci. Lett. 148 (1997) 471^483]. Mid-ocean ridge basalt (MORB) major element systematics are, to a great extent, inherited from their fertile sources, which requires caution when using major element data to infer melting conditions. The significant correlations in elemental and isotopic variability (defined as RSD% = 1c/ meanU100) between seamount and axial lavas suggest that both seamount and axial volcanisms share a common heterogeneous mantle source. We confirm previous interpretations [Niu and Batiza, Earth Planet. Sci. Lett. 148 (1997) 471^483; Niu et al., J. Geophys. Res. 104 (1999) 7067^7087] that the geochemical variability of lavas from the broad northern EPR region results from melting-induced mixing of a two-component mantle with the enriched (easily melted) component dispersed as physically distinct domains in a more depleted (refractory) matrix prior to the major melting events. The data also allow the conclusion that recycled oceanic crust cannot explain elevated abundances of elements such as Ba, Rb, Cs, Th, U, K, Pb, Sr etc. in enriched MORB and many ocean island basalts. These elements will be depleted in recycled oceanic crust that has passed through subduction zone dehydration reactions. We illustrate that deep portions of recycled oceanic lithosphere are important geochemical reservoirs hosting these and other incompatible elements as a result of metasomatism taking place at the interface between the low velocity zone and the cooling and thickening oceanic lithosphere. ß 2002 Elsevier Science B.V. All rights reserved.

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“…A duplicate of sample 94CH2/7 was generated to check reproducibility. Further details on the solution ICPMS analysis can be found in Grégoire et al (2000).…”

Section: Trace-element Analysis By Solution Icpmsmentioning

confidence: 99%

Temporal correlation of magmatic-tectonic events in the lower and upper crust in north-east Australia

Murgulov

Griffin

2011

Int J Earth Sci (Geol Rundsch)

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Trace Element Residence and Partitioning in Mantle Xenoliths Metasomatized by Highly Alkaline, Silicate- and Carbonate-rich Melts (Kerguelen Islands, Indian Ocean)

Cited by 195 publications

References 72 publications

Origin of early Cretaceous calc-alkaline lamprophyres from the Sulu orogen in eastern China: implications for enrichment processes beneath continental collisional belt

Origin of early Cretaceous calc-alkaline lamprophyres from the Sulu orogen in eastern China: implications for enrichment processes beneath continental collisional belt

Geochemistry of near-EPR seamounts: importance of source vs. process and the origin of enriched mantle component

Temporal correlation of magmatic-tectonic events in the lower and upper crust in north-east Australia

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