中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
In situ U-Pb age determination and Nd isotopic analysis of perovskites from kimberlites in southern Africa and Somerset Island, Canada

文献类型：期刊论文

作者Wu, Fu-Yuan1; Yang, Yue-Heng1; Mitchell, Roger H.2; Li, Qiu-Li1; Yang, Jin-Hui1; Zhang, Yan-Bin1
刊名LITHOS
出版日期2010-03-01
卷号115期号:1-4页码:205-222
关键词Laser Ablation U-pb Ages Nd Isotopes Perovskite Kimberlite Southern Africa Canada
ISSN号0024-4937
DOI10.1016/j.lithos.2009.12.010
文献子类Article
英文摘要Determination of the emplacement ages and initial isotopic composition of kimberlite by conventional isotopic methods using bulk rock samples is unreliable as these rocks usually contain diverse clasts of crustal- and mantle-derived materials and can be subject to post-intrusion sub-aerial alteration. In this study, 8 samples from 5 kimberlites in southern Africa and twelve samples from 7 kimberlites from Somerset Island, Canada have been selected for in situ perovskite U-Pb isotopic age determination and Nd isotopic analysis by laser ablation using thin sections and mineral separates. These fresh perovskites occur as primary groundmass minerals with grain-sizes of 10-100 pm. They were formed during the early stage of magmatic crystallization, and record data for the least contaminated or contamination-free wkimberlitic magma. U-Pb isotopic data indicate that the majority of the southern Africa kimberlites investigated were emplaced during the Cretaceous with ages of 88 +/- 3 to 97 +/- 6 Ma, although one sample yielded an Early Paleozoic age of 515 +/- 6 Ma. Twelve samples from Somerset Island yielded ages ranging from 93 +/- 4 Ma to 108 +/- 5 Ma and are contemporaneous with other Cretaceous kimberlite magmatism in central Canada (103-94 Ma). Although whole-rock compositions of the kimberlites from southern Africa have a large range of epsilon(Na)(t) values (-0.5 to + 5.1), the analysed perovskites show a more limited range of + 1.2 to + 3.1. Perovskites from Somerset Island have epsilon(Nd)(t) values of -0.2 to + 1.4. These values are lower than that of depleted asthenospheric mantle, suggesting that kimberlites might be derived from the lower mantle. This study shows that in situ U-Pb and Nd isotopic analysis of perovskite by laser ablation is both rapid and economic, and serves as a powerful tool for the determination of the emplacement age and potential source of kimberlite magmas. (C) 2009 Elsevier B.V. All rights reserved.
WOS关键词TRACE-ELEMENT COMPOSITION ; MC-ICP-MS ; RARE-EARTH ELEMENTS ; NORTH-AMERICAN KIMBERLITES ; LASER-ABLATION ; PERIDOTITE XENOLITHS ; GEOLOGICAL-MATERIALS ; ZIRCON MEGACRYSTS ; MASS-SPECTROMETRY ; ION MICROPROBE
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000276042700015
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 ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; De Beers Consolidated Mines Ltd ; De Beers Consolidated Mines Ltd ; De Beers Consolidated Mines Ltd ; De Beers Consolidated Mines Ltd ; 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 ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; De Beers Consolidated Mines Ltd ; De Beers Consolidated Mines Ltd ; De Beers Consolidated Mines Ltd ; De Beers Consolidated Mines Ltd ; 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 ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; De Beers Consolidated Mines Ltd ; De Beers Consolidated Mines Ltd ; De Beers Consolidated Mines Ltd ; De Beers Consolidated Mines Ltd ; 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 ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; De Beers Consolidated Mines Ltd ; De Beers Consolidated Mines Ltd ; De Beers Consolidated Mines Ltd ; De Beers Consolidated Mines Ltd ; 40773008) ; 40773008) ; 40773008) ; 40773008)
源URL[http://ir.iggcas.ac.cn/handle/132A11/72788]  
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,Yang, Yue-Heng,Mitchell, Roger H.,et al. In situ U-Pb age determination and Nd isotopic analysis of perovskites from kimberlites in southern Africa and Somerset Island, Canada[J]. LITHOS,2010,115(1-4):205-222.
APA Wu, Fu-Yuan,Yang, Yue-Heng,Mitchell, Roger H.,Li, Qiu-Li,Yang, Jin-Hui,&Zhang, Yan-Bin.(2010).In situ U-Pb age determination and Nd isotopic analysis of perovskites from kimberlites in southern Africa and Somerset Island, Canada.LITHOS,115(1-4),205-222.
MLA Wu, Fu-Yuan,et al."In situ U-Pb age determination and Nd isotopic analysis of perovskites from kimberlites in southern Africa and Somerset Island, Canada".LITHOS 115.1-4(2010):205-222.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。