Chemical Geodynamics

Zindler, Alan; Hart, S. R.

doi:10.1146/annurev.ea.14.050186.002425

Cited by 4,076 publications

(1,018 citation statements)

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“…Twelve islands were used in this experiment, all identified as representatives of the end-member mantle components based on Sr, Nd, and Pb isotopic data (e.g. Zindler and Hart 1986;Hofmann 2003) and average trace element ratio data (e.g. Allè-gre et al 1995;Greenough et al 2005bGreenough et al , 2007 Sr ratios are higher and lower (respectively) than all other EM1 islands used in the study (i.e.…”

Section: Data Selection and Preparationmentioning

confidence: 99%

“…The prevailing view is that melt extraction of incompatible elements from the mantle has led to formation of incompatible-element depleted mid-ocean-ridge basalt (MORB) mantle (DMM), continental crust enriched in these elements, and 3+ oceanic island basalt (OIB) end-member mantle components bearing subductionrecycled materials including: enriched mantle 1 (EM1; sediment), enriched mantle 2 (EM2; sediment), and high Mu (high µ = high U/Pb = HIMU; subduction-processed MORB) (Zindler and Hart 1986;Sun and McDonough 1989;Hofmann 1997;Bennett 2003;Hofmann 2003;Greenough et al 2007). The oceanic islands with the most extreme isotopic and trace element concentrations, representing each of the mantle components, are well established (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The oceanic islands with the most extreme isotopic and trace element concentrations, representing each of the mantle components, are well established (e.g. Zindler and Hart 1986;Hofmann 2003;Greenough et al 2005bGreenough et al , 2007; see METHODS for caveats about individual samples, and chemical variation at individual islands). However, most incompatible element ratios and radiogenic isotopic ratios are unlikely to be sensitive to processes that would impact transition metals (Fe, Cu, V, etc.…”

Section: Introductionmentioning

confidence: 99%

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Igneous Rock Associations 18. Transition Metals in Oceanic Island Basalt: Relationships with the Mantle Components

Greenough

MacKenzie

2015

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SUMMARYIncompatible elements and isotopic ratios identify three endmember mantle components in oceanic island basalt (OIB); EM1, EM2, and HIMU. We estimate compatible to mildly incompatible transition metal abundance trends (Ni, Co, Fe, Cu, Cr, V, Mn, Sc, and Zn) in 'primitive' basalt suites (Mg# = Mg/(Mg + 0.9*Fe) atomic = 0.72) from 12 end-member oceanic islands by regressing metals against Fe/Mg ratios in sample suites, and solving for concentrations at Mg/Fe = 1 (Mg# = 0.72). Using the transition metal estimates, exploratory statistics reveal that islands 'group' based on mantle component type even when La/Yb ratios are used to compensate metal concentrations for percentage melting. Higher chalcophile Zn (and Pb, earlier work) in EM1 and EM2 compared to HIMU, and higher Cr (3+) and Sc in HIMU relative to EM1, support views that HIMU represents subductionprocessed ocean floor basalt. Incompatible elements, ratios and isotopes indicate that EM1 is Archean, EM2 is Proterozoic or younger, and both are related to sediment subduction. As found with incompatible elements, EM1 and EM2 show similar 'compatible' element concentrations, but lower (multivalence) Cr, Fe and Mn in EM1 could indirectly reflect increasing oxidation of subducted sediment between the Archean and Proterozoic. Alternatively, changes in subduction processes that yielded peak continental formation in the Neoarchean, and craton-suturing in the Paleoproterozoic may account for EM1-EM2 differences. EM1 shows similar or lower Cr, Ni and Co compared to HIMU and EM2 suggesting that economic viability of layered intrusions, which have extreme EM1-like signatures, is unrelated to high metals in EM1 mantle sources, but that high % melting appears important. Because core-concentrated transition metals correlate with mantle component type, lithospheric recycling apparently controls their concentrations in OIB and core-mantle interaction may be unimportant. RÉSUMÉLes éléments incompatibles et les rapports isotopiques permettent de délimiter trois termes extrêmes de composants mantéliques dans des basaltes insulaires océaniques (OIB), soit EM1, EM2, et HIMU. Nous estimons les tendances d'abondance de métaux de transition (Ni, Co, Fe, Cu, Cr, V, Mn, Sc, and Zn) compatibles à modérément incompatibles dans des suites de basaltes « primitifs » (Mg# = Mg/(Mg + 0,9*Fe) rayon atomique = 0,72) sur 12 termes extrêmes de matériaux insulaires océaniques, par régression des concentrations des métaux sur les rapports Fe/Mg dans des échantillons des suites, la détermination étant définie au rapport Mg/Fe = 1 (Mg# = 0,72). L'utilisation d'une approche statistique exploratoire sur les estimations de métaux de transition montre que la composition des îles se « regroupent » en fonction du type de composition du manteau, cela même lorsque les ratios La/Yb sont utilisés pour compenser les concentrations de métaux pour déterminer le pourcentuel de fusion. Le caractère plus chalcophile du Zn (et Pb, travail antérieur) dans EM1 et EM2 comparé à HIMU, et la plus grande teneur en Cr ...

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Section: Data Selection and Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Igneous Rock Associations 18. Transition Metals in Oceanic Island Basalt: Relationships with the Mantle Components

Greenough

MacKenzie

2015

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“…However, the uplift model for the ELIP has come under scrutiny and Sun and McDonough (1989). EMI (enriched mantle I) range taken from Zindler and Hart (1986). GLOSS (global subducting sediment) values taken from Plank and Langmuir (1998) and Chauvel et al (2008).…”

Section: Flexure Of the Crustmentioning

confidence: 99%

“…Native Cu and Au deposits have also been identified but they appear to be related to post-ELIP hydrothermal processes. EMI and HIMU range taken from Zindler and Hart (1986). GLOSS (global subducting sediment) values taken from Plank and Langmuir (1998) and Chauvel et al (2008).…”

Section: Mineral Deposits Of the Elipmentioning

confidence: 99%

Igneous Rock Associations 16. The Late Permian Emeishan Large Igneous Province

Shellnutt

2015

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Evidence for a broadly distributed Samoan-plume signature in the northern Lau and North Fiji Basins

Price

Jackson

Blichert‐Toft

et al. 2014

Geochem. Geophys. Geosyst.

104

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Geochemical enrichment of lavas in the northern Lau Basin may reflect the influx of Samoanplume mantle into the region. We report major and trace element abundances and He-Sr-Nd-Hf-Pbisotopic measurements for 23 submarine volcanic glasses covering 10 locations in the northern Lau and North Fiji Basins, and for three samples from Wallis Island, which lies between Samoa and the Lau Basin. These data extend the western limit of geochemical observations in the Basins and improve the resolution of North-South variations in isotopic ratios. The Samoan hot spot track runs along the length of the northern trace of the Lau and North Fiji Basins. We find evidence for a Samoan-plume component in lavas as far West as South Pandora Ridge (SPR), North Fiji Basin. Isotopic signatures in SPR samples are similar to those found in Samoan Upolu shield lavas, but show a slight shift toward MORB-like compositions. We explain the origin of the enriched signatures by a model in which Samoan-plume material and ambient depleted mantle undergo decompression melting during upwelling after transiting from beneath the thick Pacific lithosphere to beneath the thin lithosphere in the northern Lau and North Fiji Basins. Other lavas found in the region with highly depleted isotopic signatures may represent isolated pockets of depleted mantle in the basins that evaded this enrichment process. We further find that mixing between the two components in our model, a variably degassed high-3 He/ 4He Samoan component and depleted MORB, can explain the diversity among geochemical data from the northern Lau Basin.

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Chemical Geodynamics

Abstract: V. A. Forearc basin evolution during the transition from collision to subduction: Neogene tectonostratigraphy and sedimentary provenance of the northwesternmost Andes.

Cited by 4,076 publications

References 14 publications

Igneous Rock Associations 18. Transition Metals in Oceanic Island Basalt: Relationships with the Mantle Components

Igneous Rock Associations 18. Transition Metals in Oceanic Island Basalt: Relationships with the Mantle Components

Igneous Rock Associations 16. The Late Permian Emeishan Large Igneous Province

Evidence for a broadly distributed Samoan-plume signature in the northern Lau and North Fiji Basins

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