The effect of Fe–Ti oxide separation on iron isotopic fractionation during basalt differentiation

Zhao, Jian; Wang, Xiao Jun; Chen, Lihui; Hanyu, Takeshi; Shi, Jing; Liu, Xiaowen; Kawabata, Hiroshi; Xie, Lie‐Wen

doi:10.1007/s00410-022-01967-w

Cited by 13 publications

(7 citation statements)

References 59 publications

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Section: Discussionmentioning

confidence: 99%

“…The Fe isotopic compositions of basalts can be modified by the fractional crystallization of those Fe‐bearing minerals (Sossi et al., 2016; Teng et al., 2008; Zhao et al., 2022). In general, Fe 3+ ‐rich magnetite and Fe 3+ ‐depleted olivine, pyroxene and ulvöspinel‐rich titanomagnetite prefer heavy Fe isotopes and light Fe isotopes, respectively (Dauphas et al., 2014; Sossi & O’Neill, 2017; Sossi et al., 2012; Teng et al., 2008; Wang et al., 2021; Williams et al., 2018; Zhao et al., 2022). For this reason, the fractional crystallization of isotopically light minerals (e.g., olivine) will drive the residue melts to be isotopically heavy, while the removal of magnetite may induce incremental enrichment in the residue melts for light Fe isotopes (e.g., McCoy‐West et al., 2018; McGee et al., 2015; Sossi et al., 2012; Teng et al., 2008; Williams et al., 2018).…”

Section: Discussionmentioning

confidence: 99%

“…During this correction, olivine in Fe-Mg equilibrium with melt composition is incrementally added into or subtracted from the melt, and the olivine and melt compositions are recalculated at each increment with 𝐴𝐴 𝐴𝐴 𝐹𝐹 𝐹𝐹−𝑀𝑀𝑀𝑀 𝐷𝐷 = 0.32 between the two phases. An olivine-melt fractionation factor (Δ 57 Fe Ol−melt ) of −0.3 × 10 6 /T 2 , which is in the widely accepted range of olivine-melt fractionation factor (−0.4 ∼ −0.3 × 10 6 /T 2 ; Ruttor et al, 2022;Shi et al, 2022;Soderman et al, 2021;Sossi & O'Neill, 2017;Zhao et al, 2022), is assumed to calculate the δ 57 Fe values of olivine and melt. The starting Fe 3+ /ΣFe is assumed to be 0.15, and the Fe isotopic compositions of these samples are corrected to magma compositions in equilibrium with Fo 86 , Fo 89 , Fo 84 olivines (the olivine with highest Fo value in each volcano) for Keluo, Nuominhe and Wudalianchi basalts, respectively.…”

Section: Fractional Crystallization and Crustal Contaminationmentioning

confidence: 99%

“…The Fe isotopic compositions of basalts can be modified by the fractional crystallization of those Fe-bearing minerals (Sossi et al, 2016;Teng et al, 2008;Zhao et al, 2022). In general, Fe 3+ -rich magnetite and Fe 3+ -depleted ).…”

Section: Fractional Crystallization and Crustal Contaminationmentioning

confidence: 99%

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Lithology of EM1 Reservoir Revealed by Fe Isotopes of Continental Potassic Basalts

et al. 2023

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The origin of EM1 (Enriched Mantle 1) reservoir, initially defined by the ocean island basalts (OIBs) with extremely low 143Nd/144Nd and 206Pb/204Pb, has been long debated, because melting of the ambient refractory peridotite along with the EM1 component will dilute the “EM1 fingerprints” recorded in these rocks. Comparing to the OIBs, Cenozoic potassic basalts from northeast China, the typical EM1‐type basalts in continental region, are formed at a lower‐degree melting, and therefore have the chance to preserve more information of the EM1 component. Here high‐precision Fe isotopes of these potassic basalts are reported to constrain the source lithology. Their δ57Fe (0.15–0.28‰) are positively correlated with the K2O, SiO2, K/U, and Rb/Y, and negatively correlated with the εNd and δ26Mg, forming binary mixing arrays. One endmember is the inferred EM1 reservoir, whereas the other is the local lithospheric mantle. Major elemental compositions of the melts released from the EM1 component resemble those sediment‐derived experimental melts. Combining with their heavier Fe isotopes and higher Zn/Fe ratios relative to those mid‐ocean ridge basalts (MORBs), an eclogitic source of these potassic basalts is therefore proposed to account for these features. Differing from the most conventional thinking of the metasomatized, phlogopite‐bearing lithospheric mantle, we argue that the EM1 component in the source of continental potassic basalts are composed of ancient subducted crustal materials (i.e., recycled sediment ± oceanic crust). This deep EM1 component will transform into eclogite and release high‐SiO2 potassic melts when ascending to the shallow asthenosphere.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Fractional Crystallization and Crustal Contaminationmentioning

confidence: 99%

Section: Fractional Crystallization and Crustal Contaminationmentioning

confidence: 99%

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Lithology of EM1 Reservoir Revealed by Fe Isotopes of Continental Potassic Basalts

et al. 2023

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“…Although low‐temperature alteration may cause basaltic rocks to have lighter δ 65 Cu and higher δ 56 Fe values relative to the unaltered ones (Liu, Teng, et al., 2014), there is a lack of correlations of δ 65 Cu and δ 56 Fe with LOI or CIA in our samples (Figure S3 in Supporting Information S1). Recent studies show that Fe and Cu isotopes may be fractionated at late‐stage magmatic differentiation, typically when Fe–Ti oxides start to crystallize from the liquidus at MgO < ∼4 wt% (Sun, Niu, Chen, et al., 2023; Zhao et al., 2022). On the other hand, olivine crystallization during early differentiation, if any, produces higher δ 56 Fe values and negligible Cu isotope fractionation in the melts (e.g., Kilauea lki trend in Figures 5a and 5b; Savage et al., 2015; Teng et al., 2008).…”

Section: Discussionmentioning

confidence: 99%

Mantle Oxidation Induced by Recycled Carbonate: Insights From Mg‐Zn‐Fe‐Cu Isotopic Systematics of Intraplate Basalts

Wu,

Liu

2023

JGR Solid Earth

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Mantle oxidation plays an essential role in volatile cycling between Earth’s interior and exterior. However, the conceivable oxidizer remains enigmatic and needs to be explored by geochemical tools. Here, we examine the potential of recycled carbonates in inducing redox changes of the deep mantle through combined isotopic studies of Mg (δ26Mg), Zn (δ66Zn), Fe (δ56Fe), and Cu (δ65Cu) on a suite of intraplate alkaline basalts proposed to have originated from the mantle transition zone (∼440–660 km). Compared with mid‐ocean ridge basalts (MORB), these basalts have variably lower δ26Mg and higher δ66Zn, the typical features of marine carbonates, indicating the presence of various amounts of deeply recycled carbonates in their sources. As the estimated amounts of recycled carbonates in sources increase (i.e., lower δ26Mg and higher δ66Zn), the basalts have higher δ56Fe and lower δ65Cu compared with MORB. These correlations cannot be explained alone by binary mixing between recycled carbonates and the pristine mantle because of the much lower Fe and Cu contents of marine carbonates than those of the mantle and instead require redox‐driven isotope fractionation induced by mantle carbonate metasomatism. During partial melting of an oxidized mantle source, isotopically heavy ferric iron and isotopically light sulfide were preferentially incorporated/dissolved into the melts that are enriched in heavy Fe and light Cu isotopes. These observations highlight that recycled carbonates serve as an important oxidizer for the deep mantle and facilitate the extraction of mantle sulfides, which can be effectively tracked by Fe and Cu isotopic systematics of intraplate basalts.

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Titanium isotopic fractionation during alkaline magma differentiation at St. Helena Island

Zhao,

Wang,

Jia

et al. 2023

Contrib Mineral Petrol

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The effect of Fe–Ti oxide separation on iron isotopic fractionation during basalt differentiation

Cited by 13 publications

References 59 publications

Lithology of EM1 Reservoir Revealed by Fe Isotopes of Continental Potassic Basalts

Lithology of EM1 Reservoir Revealed by Fe Isotopes of Continental Potassic Basalts

Mantle Oxidation Induced by Recycled Carbonate: Insights From Mg‐Zn‐Fe‐Cu Isotopic Systematics of Intraplate Basalts

Titanium isotopic fractionation during alkaline magma differentiation at St. Helena Island

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