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In situ U-Pb age determination and Sr-Nd isotopic analysis of perovskite from the Premier (Cullinan) kimberlite, South Africa

文献类型：期刊论文

作者Wu, Fu-Yuan1; Mitchell, Roger H.2; Li, Qiu-Li1; Sun, Jing1; Liu, Chuan-Zhou1; Yang, Yue-Heng1
刊名CHEMICAL GEOLOGY
出版日期2013-08-30
卷号353页码:83-95
关键词Emplacement age Nd-Sr isotopes Perovskite Premier kimberlite
ISSN号0009-2541
DOI10.1016/j.chemgeo.2012.06.002
文献子类Article
英文摘要South Africa is characterized by multiple episodes of kimberlite intrusion. However, the age and Sr-Nd isotopic compositions of the primary magma of most of the earlier emplacement events remain unresolved. Using in situ secondary ion mass spectrometry and laser ablation multi-collector inductively coupled plasma mass spectrometry, the U-Pb ages and Sr-Nd isotopic compositions were obtained for perovskite from the Premier (Cullinan) kimberlite: one of the oldest diamondiferous kimberlites. The U-Pb perovskite ages are 1150 +/- 16, 1151 +/- 9, and 1156 +/- 12 Ma for the brown, black, and green kimberlites, respectively, demonstrating that the different phases of the kimberlite were emplaced contemporaneously at similar to 1150 Ma. In situ Sr-Nd isotopic analyses of perovskite yield initial Sr isotopic ratios and epsilon(Nd)(t)(1150) values of 0.7031 +/- 4 and 1.9 +/- 0.9 for the brown; 0.7025 +/- 1 and 1.8 +/- 0.4 for the black; and 0.7030 +/- 2 and 0.8 +/- 0.7 for the green kimberlites. These are essentially identical within analytical uncertainties and suggest that the kimberlites were derived from a moderately-depleted mantle source. In contrast, whole-rock data yield variable Sr-Nd isotopic compositions, confirming that whole-rock isotopic data cannot be used to constrain the character of the source of kimberlitic magma due to crustal contamination, later alteration and/or weathering. Our data also indicate that kimberlite emplacement might be considered as a prelude to mantle plume activity beneath a craton. (c) 2012 Elsevier B.V. All rights reserved.
WOS关键词IONIZATION MASS-SPECTROMETRY ; LARGE IGNEOUS PROVINCE ; LA-MC-ICPMS ; LITHOSPHERIC MANTLE ; PERIDOTITE XENOLITHS ; MINERAL INCLUSIONS ; KAAPVAAL CRATON ; SUBCONTINENTAL MANTLE ; EASTERN ZIMBABWE ; SOMERSET ISLAND
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000324469400007
出版者ELSEVIER SCIENCE BV
资助机构Natural Science Foundation of China(41130313) ; Natural Science Foundation of China(41130313) ; Natural Science Foundation of China(41130313) ; Natural Science Foundation of China(41130313) ; Natural Science Foundation of China(41130313) ; Natural Science Foundation of China(41130313) ; Natural Science Foundation of China(41130313) ; Natural Science Foundation of China(41130313) ; Natural Science Foundation of China(41130313) ; Natural Science Foundation of China(41130313) ; Natural Science Foundation of China(41130313) ; Natural Science Foundation of China(41130313) ; Natural Science Foundation of China(41130313) ; Natural Science Foundation of China(41130313) ; Natural Science Foundation of China(41130313) ; Natural Science Foundation of China(41130313)
源URL[http://ir.iggcas.ac.cn/handle/132A11/87818]  
专题中国科学院地质与地球物理研究所
通讯作者Wu, Fu-Yuan
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Lakehead Univ, Dept Geol, Thunder Bay, ON P7B 5E1, Canada
推荐引用方式
GB/T 7714		 Wu, Fu-Yuan,Mitchell, Roger H.,Li, Qiu-Li,et al. In situ U-Pb age determination and Sr-Nd isotopic analysis of perovskite from the Premier (Cullinan) kimberlite, South Africa[J]. CHEMICAL GEOLOGY,2013,353:83-95.
APA Wu, Fu-Yuan,Mitchell, Roger H.,Li, Qiu-Li,Sun, Jing,Liu, Chuan-Zhou,&Yang, Yue-Heng.(2013).In situ U-Pb age determination and Sr-Nd isotopic analysis of perovskite from the Premier (Cullinan) kimberlite, South Africa.CHEMICAL GEOLOGY,353,83-95.
MLA Wu, Fu-Yuan,et al."In situ U-Pb age determination and Sr-Nd isotopic analysis of perovskite from the Premier (Cullinan) kimberlite, South Africa".CHEMICAL GEOLOGY 353(2013):83-95.

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来源：地质与地球物理研究所

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