High-precision Mg isotope analyses of low-Mg rocks by MC-ICP-MS

doi:10.1016/j.chemgeo.2014.09.014

	High-precision Mg isotope analyses of low-Mg rocks by MC-ICP-MS
	An, Yajun 1; Wu, Fei 1; Xiang, Yuanxin 2; Nan, Xiaoyun 1; Yu, Xun 3; Yang, Jinhui 2; Yu, Huimin 1; Xie, Liewen 2; Huang, Fang 1
刊名	CHEMICAL GEOLOGY
	2014-12-18
卷号	390 页码:9-21
关键词	Mg isotopes MC-ICP-MS Low-Mg samples
ISSN号	0009-2541
DOI	10.1016/j.chemgeo.2014.09.014
文献子类	Article
英文摘要	We present a method for precise measurement of Mg isotope ratios for low-Mg rock samples (where MgO <1 wt.%) by multi-collector inductively coupled plasma-mass spectrometry (MC-ICP-MS). The efficiency of Mg purification is significantly improved by using a newly calibrated HNO3 + HF step to remove undesired matrix elements (such as Ti, Al, Fe, and K) in low-Mg samples. We also establish that increasing the amount of Mg loaded to the chromatographic column minimized blank effects of organics leached from cation resin. All parameters that could affect the accuracy and precision of Mg isotope analyses were rigorously examined by two independent laboratories in Beijing and Hefei. The delta Mg-26 of mono-elemental Mg standard CAM-1 measured in the two laboratories were -2.597 +/- 0.042 parts per thousand (2 sigma, n = 49) and -2.598 +/- 0.039 parts per thousand (2 sigma, n = 79), respectively; in house standard IGGMg1 were -1.742 +/- 0.041 parts per thousand (2 sigma, n = 53) and -1.749 +/- 0.049 parts per thousand (2 sigma, n = 72), respectively. The average delta Mg-26 over ten months of two synthetic standards, made by doping IGGMg1 and IGGMg2 with matrix elements, agrees well with their recommended values, within error. The robustness of our method was further assessed by replicated analyses of sixteen rock standards with MgO contents from 0.28 wt.% to 49.4 wt.%. The delta Mg-26 of USGS rhyolite standards RGM-1 and RGM-2 are -0.188 +/- 0.031 parts per thousand (2 sigma, n = 35) and -0.182 +/- 0.041 parts per thousand (2 sigma, n = 72), respectively; granite standard GA is -0.165 +/- 0.038 parts per thousand (2 sigma, n = 57), G-2 is -0.129 +/- 0.045 parts per thousand (2 sigma, n = 34), GS-N is -0.204 +/- 0.059 parts per thousand (2 sigma, n = 33), GSP-2 is 0.042 +/- 0.020 parts per thousand (2 sigma, n = 15), and GSR-1 is -0.234 +/- 0.016 parts per thousand (2 sigma, n = 17). Based on repeated analyses of standards, the long-term external precision of our method is better than +/- 0.05 parts per thousand for delta Mg-26. This precision allows us to distinguish the fractionation of Mg isotopes in low-Mg granites and rhyolites as well as that between mantle minerals. (C) 2014 Elsevier B.V. All rights reserved.
WOS关键词	PLASMA-MASS SPECTROMETRY ; NORTH CHINA CRATON ; PERIDOTITE XENOLITHS ; MAGNESIUM ISOTOPES ; RATIO MEASUREMENTS ; CONTINENTAL-CRUST ; FRACTIONATION ; MANTLE ; EARTH ; SYSTEMATICS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000345442400002
资助机构	National Science Foundation of China(41173031 ; National Science Foundation of China(41173031 ; National Science Foundation of China(41173031 ; National Science Foundation of China(41173031 ; 111 Project ; 111 Project ; 111 Project ; 111 Project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(SKL1301) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(SKL1301) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(SKL1301) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(SKL1301) ; 41325011 ; 41325011 ; 41325011 ; 41325011 ; 40873009) ; 40873009) ; 40873009) ; 40873009) ; National Science Foundation of China(41173031 ; National Science Foundation of China(41173031 ; National Science Foundation of China(41173031 ; National Science Foundation of China(41173031 ; 111 Project ; 111 Project ; 111 Project ; 111 Project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(SKL1301) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(SKL1301) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(SKL1301) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(SKL1301) ; 41325011 ; 41325011 ; 41325011 ; 41325011 ; 40873009) ; 40873009) ; 40873009) ; 40873009) ; National Science Foundation of China(41173031 ; National Science Foundation of China(41173031 ; National Science Foundation of China(41173031 ; National Science Foundation of China(41173031 ; 111 Project ; 111 Project ; 111 Project ; 111 Project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(SKL1301) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(SKL1301) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(SKL1301) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(SKL1301) ; 41325011 ; 41325011 ; 41325011 ; 41325011 ; 40873009) ; 40873009) ; 40873009) ; 40873009) ; National Science Foundation of China(41173031 ; National Science Foundation of China(41173031 ; National Science Foundation of China(41173031 ; National Science Foundation of China(41173031 ; 111 Project ; 111 Project ; 111 Project ; 111 Project ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(SKL1301) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(SKL1301) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(SKL1301) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(SKL1301) ; 41325011 ; 41325011 ; 41325011 ; 41325011 ; 40873009) ; 40873009) ; 40873009) ; 40873009)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/85561]
专题	中国科学院地质与地球物理研究所
通讯作者	Xie, Liewen
作者单位	1.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 3.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210093, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	An, Yajun,Wu, Fei,Xiang, Yuanxin,et al. High-precision Mg isotope analyses of low-Mg rocks by MC-ICP-MS[J]. CHEMICAL GEOLOGY,2014,390:9-21.
APA	An, Yajun.,Wu, Fei.,Xiang, Yuanxin.,Nan, Xiaoyun.,Yu, Xun.,...&Huang, Fang.(2014).High-precision Mg isotope analyses of low-Mg rocks by MC-ICP-MS.CHEMICAL GEOLOGY,390,9-21.
MLA	An, Yajun,et al."High-precision Mg isotope analyses of low-Mg rocks by MC-ICP-MS".CHEMICAL GEOLOGY 390(2014):9-21.