Diffusion-driven Zn and Mg isotope fractionation in magmatic Fe-Ti-Cr oxides and implications for timescales of magmatic processes

Wang, Zhao-Xue; Liu, Sheng‐Ao; Yang, Chun; Wang, Zezhou; Liu, Jingao

doi:10.1016/j.gca.2023.05.009

Cited by 7 publications

(1 citation statement)

References 93 publications

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“…Wang et al, 2021). However, fractional crystallization of chromite and Fe-Ti oxide that are strongly enriched in Zn and lighter Zn isotopes relative to the melt would lead to a negative correlation between Zn concentration and δ 66 Zn in the differentiated melt Z.-X. Wang et al, 2023;.…”

Section: Mg and Zn Isotopic Evidence For Deeply Recycled Carbonate In...mentioning

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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Section: Mg and Zn Isotopic Evidence For Deeply Recycled Carbonate In...mentioning

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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High‐precision zinc isotope measurement of chemically different geostandards by multicollector inductively coupled plasma mass spectrometry

Liu

Wan

et al. 2023

Rapid Comm Mass Spectrometry

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RationaleZinc isotopes are becoming increasingly applicable in high‐temperature geochemistry, for example in crust–mantle interaction and volatilization‐related processes. The published zinc isotope data for some commonly used reference materials, however, show large interlaboratory offsets. In addition, there is still limited data for zinc isotope compositions of many widely used geological reference materials.MethodsFor precise and accurate zinc isotopic ratio analysis of chemically diverse geostandards, including ultramafic to felsic igneous rocks, carbonatites, sediments and soils, an improved procedure for chemical purification of zinc was introduced in this study. The factors potentially affecting zinc isotopic ratio measurement were assessed. The accuracy and long‐term reproducibility were obtained by measurements on both synthetic solutions and well‐characterized geostandards.ResultsPurification of geologic samples with different zinc concentrations and matrix compositions yields consistent elution curves with nearly 100% recovery. Acidity and concentration mismatches and the presence of some matrix elements (e.g., Mg, Ti and Cr) have significant impacts on the precision and accuracy of zinc isotopic ratio measurement. The zinc isotope compositions of a suite of reference materials were measured using this method.ConclusionsThe present study describes methods for the chemical purification of zinc and high‐precision and accurate zinc isotopic ratio measurements using multicollector inductively coupled plasma mass spectrometer (MC‐ICP‐MS). The long‐term external reproducibility for δ66Zn values is ±0.04‰ (2SD). High‐quality zinc isotope data of chemically different geostandards were reported to stimulate future interlaboratory calibrations.

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Non-traditional stable isotope geochemistry of oceanic basalts

Teng,

Williams

2025

Treatise on Geochemistry

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Diffusion-driven Zn and Mg isotope fractionation in magmatic Fe-Ti-Cr oxides and implications for timescales of magmatic processes

Cited by 7 publications

References 93 publications

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

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

High‐precision zinc isotope measurement of chemically different geostandards by multicollector inductively coupled plasma mass spectrometry

Non-traditional stable isotope geochemistry of oceanic basalts

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