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  4. 中国科学院矿产资源研究重点实验室
Magnesium and iron isotopic evidence of inter-mineral diffusion in ultramafic cumulates of the Peridotite Zone, Stillwater Complex

文献类型：期刊论文

作者Bai, Yang2,3,4; Su, Ben-Xun3,4; Xiao, Yan1; Cui, Meng-Meng3,4; Charlier, Bernard2
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2021
卷号292页码:152-169
关键词Stillwater Complex Fe-Mg isotopes Chemical diffusion Interstitial liquid
ISSN号0016-7037
DOI10.1016/j.gca.2020.09.023
英文摘要To better understand the role and extent of inter-mineral diffusion during subsolidus processes, we investigated the iron and magnesium isotopic compositions of olivine, orthopyroxene, and chromite separates from the Peridotite Zone of the Stillwater Complex. Olivine and orthopyroxene show limited Mg isotopic variations, with delta Mg-26 values ranging from -0.40 to 0.26 parts per thousand and from -0.29 to -0.2 parts per thousand, respectively. In contrast, chromite displays extremely large Mg isotopic variations, with delta Mg-26 values ranging from -0.05 to +0.84 parts per thousand. The delta Fe-56 values of olivine and orthopyroxene range from 0.00 to +0.17 parts per thousand and 0.04 to +0.06 parts per thousand, respectively, whereas those of chromite range from -0.09 to +0.13 parts per thousand. Most olivine-orthopyroxene pairs in our samples show no clear Fe-Mg isotopic differences, whereas silicate and coexisting chromite pairs plot away from theoretically predicted equilibrium lines, indicating disequilibrium inter-mineral fractionation. Higher delta Fe-56 values in silicates than in chromite and significantly higher delta Mg-26 values in chromite than in silicates indicate that subsolidus re-equilibration is responsible for the observed disequilibrium Fe-Mg isotope fractionation. We develop a quantitative model based on the investigated olivine and chromite to reproduce the observed kinetic Fe-Mg isotope fractionations. Our model results indicate a systematic difference between the Fe and Mg isotope fractionation factors, beta, of olivine (beta(Fe) approximate to 0.27 and beta(Mg) approximate to 0.16) and chromite (0.03 < beta(Fe) < 0.08 and 0.05 < beta(Mg) < 0.16). This study demonstrates that combined investigations of the Fe-Mg isotopic compositions of cumulus minerals provide more recognizable and more reliable information on inter-mineral diffusion among igneous minerals in magma chambers than elemental analyses alone. (c) 2020 Elsevier Ltd. All rights reserved.
WOS关键词FE-MG DIFFUSION ; MAFIC LAYERED INTRUSION ; MAGMATIC DIFFERENTIATION ; MANTLE METASOMATISM ; ORTHO-PYROXENE ; TIME SCALES ; CRYSTALLIZATION HISTORY ; LUOBUSA OPHIOLITE ; MELT PERCOLATION ; BUSHVELD COMPLEX
资助项目National Natural Science Foundation of China[41973012] ; National Natural Science Foundation of China[91755205] ; National Natural Science Foundation of China[41772055] ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0801]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000590782100009
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)
源URL[http://ir.iggcas.ac.cn/handle/132A11/98731]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Bai, Yang; Su, Ben-Xun
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Liege, Dept Geol, B-4000 Liege, Belgium
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Bai, Yang,Su, Ben-Xun,Xiao, Yan,et al. Magnesium and iron isotopic evidence of inter-mineral diffusion in ultramafic cumulates of the Peridotite Zone, Stillwater Complex[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2021,292:152-169.
APA Bai, Yang,Su, Ben-Xun,Xiao, Yan,Cui, Meng-Meng,&Charlier, Bernard.(2021).Magnesium and iron isotopic evidence of inter-mineral diffusion in ultramafic cumulates of the Peridotite Zone, Stillwater Complex.GEOCHIMICA ET COSMOCHIMICA ACTA,292,152-169.
MLA Bai, Yang,et al."Magnesium and iron isotopic evidence of inter-mineral diffusion in ultramafic cumulates of the Peridotite Zone, Stillwater Complex".GEOCHIMICA ET COSMOCHIMICA ACTA 292(2021):152-169.

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来源：地质与地球物理研究所

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