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Magnesium isotopic evidence for chemical disequilibrium among cumulus minerals in layered mafic intrusion
Lie-Meng Chen; Fang-Zhen Teng; Xie-Yan Song; Rui-Zhong Hu; Song-Yue Yu; Dan Zhu; Jian Kang
2018
发表期刊Earth and Planetary Science Letters
卷号487页码:74-83
摘要

Magnesium isotopic compositions of olivine, clinopyroxene, and ilmenite from the Baima intrusion, SW China, for the first time, are investigated to constrain the magnitude and mechanisms of Mg isotope fractionation among cumulus minerals in layered mafic intrusions and to evaluate their geological implications. Olivine and clinopyroxene have limited Mg isotope variations, with δ26Mg ranging from −0.33 to +0.05 and from −0.29 to −0.13, respectively, similar to those of mantle xenolithic peridotites. By contrast, ilmenites display extremely large Mg isotopic variation, with δ26Mg ranging from −0.50 to +1.90. The large inter-mineral fractionations of Mg isotopes between ilmenite and silicates may reflect both equilibrium and kinetic processes. A few ilmenites have lighter Mg isotopic compositions than coexisting silicates and contain high MgO contents without compositional zoning, indicating equilibrium fractionation. The implication is that the light Mg isotopic compositions of lunar high-Ti basalts may result from an isotopically light source enriched in cumulate ilmenites. On the other hand, most ilmenites have heavy Mg isotopic compositions, coupled with high MgO concentration and chemical zoning, which can be quantitatively modeled by kinetic Mg isotope fractionations induced by subsolidus Mg–Fe exchange between ilmenite and ferromagnesian silicates during the cooling of the Baima intrusion. The extensive occurrence of kinetic Mg isotope fractionation in ilmenites implies the possibility of widespread compositional disequilibrium among igneous minerals in magma chambers. Consequently, disequilibrium effects need to be considered in studies of basaltic magma evolution, magma chamber processes, and magmatic Fe–Ti oxide ore genesis.

关键词Magnesium Isotopes kinetic Isotope Fractionation chemical Diffusion compositional Zoning baima Mafic Intrusion
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8705
专题矿床地球化学国家重点实验室
作者单位1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, PR China
2.sotope Laboratory, Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195, USA
3.University of Chinese Academy of Sciences, Beijing 100049, PR China
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Lie-Meng Chen,Fang-Zhen Teng,Xie-Yan Song,et al. Magnesium isotopic evidence for chemical disequilibrium among cumulus minerals in layered mafic intrusion[J]. Earth and Planetary Science Letters,2018,487:74-83.
APA Lie-Meng Chen.,Fang-Zhen Teng.,Xie-Yan Song.,Rui-Zhong Hu.,Song-Yue Yu.,...&Jian Kang.(2018).Magnesium isotopic evidence for chemical disequilibrium among cumulus minerals in layered mafic intrusion.Earth and Planetary Science Letters,487,74-83.
MLA Lie-Meng Chen,et al."Magnesium isotopic evidence for chemical disequilibrium among cumulus minerals in layered mafic intrusion".Earth and Planetary Science Letters 487(2018):74-83.
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