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In situ perovskite Sr-Nd isotopic constraints on the petrogenesis of the Ordovician Mengyin kimberlites in the North China Craton

文献类型：期刊论文

作者Yang, Yue-Heng1; Wu, Fu-Yuan1; Wilde, Simon A.2; Liu, Xiao-Ming3; Zhang, Yan-Bin1; Xie, Lie-Wen1; Yang, Jin-Hui1
刊名CHEMICAL GEOLOGY
出版日期2009-06-30
卷号264期号:1-4页码:24-42
关键词Laser ablation analyses Sr-Nd-Hf isotopes Perovskite Mengyin kimberlite North China Craton
ISSN号0009-2541
DOI10.1016/j.chemgeo.2009.02.011
文献子类Review
英文摘要Precise Sr, Nd and Hf isotopic data are important indicators in deciphering the evolution of magmatic rocks and their source. However, such data are difficult to obtain for kimberlite, since these rocks are commonly contaminated by both crustal and mantle materials and also show extensive alteration and weathering following emplacement. in this study. numerous kimberlitic samples from Mengyin in northeast China were selected for U-Pb dating and Sr-Nd-Hf isotopic analysis of perovskite. In situ U-Pb analyses of fresh perovskite yield an age of 470 +/- 4 Ma, which is considered the emplacement age of the Mengyin kimberlite. However, the altered perovskite shows Pb loss and yields Paleozoic-Mesozoic ages, indicating that perovskite is not as strongly resistant to isotopic modification as previously thought. In situ Sr-Nd isotopic analyses by laser ablation of perovskite grains collected from the main Mengyin kimberlite record uniform Sr and Nd isotopic compositions with an average initial Sr-87/Sr-86 ratio of 0.70371 +/- 12 and epsilon(Nd)(t) value of 0.13 +/- 0.22, which are identical, within uncertainties, to the values obtained by solution analyses. However, they are significantly different from comparable data obtained from whole rock samples, indicating that initial Sr-Nd isotopic ratios calculated from whole rock measurements on kimberlites are likely to record mixed isotopic signatures, due to crustal contamination and/or subsequent alteration. This conclusion is also supported by the Hf isotopic data for perovskite. Meaningful isotopic ratios for kimberlite can therefore only be obtained from single minerals such as pervoskite. The Mengyin samples investigated in this study have isotopic compositions similar to the Group I kimberlite, as defined in Southern Africa, and are interpreted to reflect derivation from a primitive mantle source. Combined with the fact that the Mengyin kimberlites were emplaced coevally with regional lithospheric uplift in the Ordovician at similar to 470 Ma, it is proposed that a mantle plume triggered kimberlite magmatism in this part of the North China Craton. (c) 2009 Elsevier B.V. All rights reserved.
WOS关键词PLASMA-MASS SPECTROMETRY ; RARE-EARTH-ELEMENTS ; MC-ICP-MS ; LITHOSPHERIC MANTLE BENEATH ; SINO-KOREAN CRATON ; U-PB ; LU-HF ; WEST GREENLAND ; SOUTH-AFRICA ; GROUNDMASS PEROVSKITE
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000267379900003
出版者ELSEVIER SCIENCE BV
资助机构Natural Science Foundation of China(40634019 ; Natural Science Foundation of China(40634019 ; Natural Science Foundation of China(40634019 ; Natural Science Foundation of China(40634019 ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; 40773008) ; 40773008) ; 40773008) ; 40773008) ; Natural Science Foundation of China(40634019 ; Natural Science Foundation of China(40634019 ; Natural Science Foundation of China(40634019 ; Natural Science Foundation of China(40634019 ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; 40773008) ; 40773008) ; 40773008) ; 40773008) ; Natural Science Foundation of China(40634019 ; Natural Science Foundation of China(40634019 ; Natural Science Foundation of China(40634019 ; Natural Science Foundation of China(40634019 ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; 40773008) ; 40773008) ; 40773008) ; 40773008) ; Natural Science Foundation of China(40634019 ; Natural Science Foundation of China(40634019 ; Natural Science Foundation of China(40634019 ; Natural Science Foundation of China(40634019 ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; 40773008) ; 40773008) ; 40773008) ; 40773008)
源URL[http://ir.iggcas.ac.cn/handle/132A11/70826]  
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.Curtin Univ Technol, Dept Appl Geol, Perth, WA 6845, Australia
3.NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 750069, Peoples R China
推荐引用方式
GB/T 7714		 Yang, Yue-Heng,Wu, Fu-Yuan,Wilde, Simon A.,et al. In situ perovskite Sr-Nd isotopic constraints on the petrogenesis of the Ordovician Mengyin kimberlites in the North China Craton[J]. CHEMICAL GEOLOGY,2009,264(1-4):24-42.
APA Yang, Yue-Heng.,Wu, Fu-Yuan.,Wilde, Simon A..,Liu, Xiao-Ming.,Zhang, Yan-Bin.,...&Yang, Jin-Hui.(2009).In situ perovskite Sr-Nd isotopic constraints on the petrogenesis of the Ordovician Mengyin kimberlites in the North China Craton.CHEMICAL GEOLOGY,264(1-4),24-42.
MLA Yang, Yue-Heng,et al."In situ perovskite Sr-Nd isotopic constraints on the petrogenesis of the Ordovician Mengyin kimberlites in the North China Craton".CHEMICAL GEOLOGY 264.1-4(2009):24-42.

入库方式： OAI收割

来源：地质与地球物理研究所

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