Iron and magnesium isotopic compositions of peridotite xenoliths from Eastern China

Huang, Fang; Zhang, Zhaofeng; Lundstrom, Craig C.; Zhi, Xiachen

doi:10.1016/j.gca.2011.03.036

Cited by 175 publications

(82 citation statements)

References 78 publications

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“…The standard materials were also analysed, with d 26 Mg = À0.20 ± 0.09‰ for BCR-2, d 26 Mg = À0.27 ± 0.01‰ for BHVO-2 and d 26 Mg = À0.48 ± 0.03‰ for GSR-3. These values are consistent with previously published data (À0.36 to À0.16‰ for BCR-2 and À0.32 to À0.16‰ for BHVO-2; Teng et al, 2007Teng et al, , 2015Huang et al, 2009Huang et al, , 2011Huang et al, , 2015An et al, 2014).…”

Section: Methodssupporting

confidence: 93%

Origin of low δ26Mg basalts with EM-I component: Evidence for interaction between enriched lithosphere and carbonated asthenosphere

Tian

Yang

et al. 2016

Geochimica et Cosmochimica Acta

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This study presents stable Mg isotopic data for Cenozoic potassic basalts from Wudalianchi and Erkeshan in northeastern China to determine the interactions between upwelling carbonated asthenosphere and enriched lithospheric mantle. Although the Wudalianchi and Erkeshan basalts have variable MgO contents of 4.45 to 9.47 wt.%, they exhibit a homogeneous Mg isotopic composition with d 26 Mg values ranging from À0.57‰ to À0.46‰ and averaging À0.51 ± 0.06‰ (2SD, n = 18). This Mg isotopic composition is lighter than that of the average mantle (d 26 Mg = À0.25 ± 0.07‰) but similar to late Cretaceous (<110 Ma) and Cenozoic basalts from the North China Craton and the South China Block (d 26 Mg = À0.60 to À0.35‰). The high CaO/Al 2 O 3 and Ba/Rb, and low Hf/Hf * ratios of the Wudalianchi and Erkeshan basalts are typical characteristics of carbonatitic metasomatism, suggesting that the light Mg isotopic composition could derive from involvement of recycled sedimentary carbonates in the mantle source. The high Dy/Er ratios (2.55 to 2.75) and excess of 230 Th ( 230 Th/ 238 U = 1.24 to 1.33) suggest presence of garnet in a relatively deep mantle source. Additionally, the seismic tomographic observations show the existence of the stagnant Pacific slab in the mantle transition zone (410-660 km) under eastern China. This carbonated mantle source should be located in the asthenosphere. However, compared to other low d 26 Mg basalts from eastern China with MORB-like Sr-Nd-Pb isotopic compositions and OIB-like trace element features, the Wudalianchi and Erkeshan basalts exhibit EM-I Sr-Nd-Pb isotopic compositions combined with high SiO 2 , Ba, K, Pb and LREE contents, high Ba/Th and low Ce/Pb ratios. These geochemical features require a contribution from another mantle source, most likely an EM-I lithospheric mantle. Therefore, an asthenosphere-lithosphere interaction model is proposed for determine the origin of the Wudalianchi and Erkeshan basalts. The original melt was derived from partial melting of the carbonated asthenospheric mantle that was metasomatized by carbonate melt from the stagnant Pacific slab in the mantle transition zone. This ascending melt with a low d 26 Mg signature subsequently interacted with the EM-I lithospheric mantle. The interaction dissolved pyroxene and crystallized olivine, releasing LILE, REE, Sr and Pb from dissolved minerals into the melt. Simultaneously, Mg was inherited by newly formed olivine. Therefore, this interaction modified the trace elements and the Sr-Nd-Pb isotopic compositions of the melt toward EM-I geochemical features but preserved the light Mg isotope signatures.

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Section: Methodssupporting

confidence: 93%

Origin of low δ26Mg basalts with EM-I component: Evidence for interaction between enriched lithosphere and carbonated asthenosphere

Tian

Yang

et al. 2016

Geochimica et Cosmochimica Acta

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“…The USGS basalt standards, BCR-2 and BHVO-2 have average d 26 Mg values of À0.11 ± 0.05& (2r) and À0.34 ± 0.07& (2r), respectively, consistent with the published values (Ref. Huang et al, 2011;Teng et al, 2015). Two synthetic solutions, MgCl 2 and CaCl 2 with molar ratio of 1:10 and the pure MgCl 2 solution, have d 26 Mg values of À3.73 ± 0.10& and À3.93 ± 0.10&, respectively (Table 1).…”

Section: Magnesium Isotopessupporting

confidence: 87%

Magnesium isotopic compositions of the Mesoproterozoic dolostones: Implications for Mg isotopic systematics of marine carbonates

Huang

Shen

Lang

et al. 2015

Geochimica et Cosmochimica Acta

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“…There is some complexity in δ 7 Li associated with [Li] gradients in the plagioclase 248 lherzolite zone, but there is an anomalously low value of δ 7 Li associated with a spike in La 249 concentration at ~90 m. This feature is superimposed on an overall increase in Li, TiO 2 and 250 La concentrations away from the boundary with the spinel lherzolite ( Fig. 2b-d other studies (Handler et al, 2009;Yang et al, 2009;Young et al, 2009;Bourdon et al, 2010;260 Dauphas et al, 2010;Teng et al, 2010;Huang et al, 2011;Pogge von Strandmann et al, 261 2011). 262…”

Section: Whole-rock Analyses 240mentioning

confidence: 81%

The influence of melt infiltration on the Li and Mg isotopic composition of the Horoman Peridotite Massif

Lai

Strandmann

Dohmen

et al. 2015

Geochimica et Cosmochimica Acta

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Iron and magnesium isotopic compositions of peridotite xenoliths from Eastern China

Cited by 175 publications

References 78 publications

Origin of low δ26Mg basalts with EM-I component: Evidence for interaction between enriched lithosphere and carbonated asthenosphere

Origin of low δ26Mg basalts with EM-I component: Evidence for interaction between enriched lithosphere and carbonated asthenosphere

Magnesium isotopic compositions of the Mesoproterozoic dolostones: Implications for Mg isotopic systematics of marine carbonates

The influence of melt infiltration on the Li and Mg isotopic composition of the Horoman Peridotite Massif

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