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Zircon LA-ICP-MS U-Pb age, Ce^4+/Ce^3+ ratios and the geochemical features of the Machangqing complex associated with copper deposit
引用本文:梁华英,喻亨祥,莫测辉,张玉泉,谢应雯.Zircon LA-ICP-MS U-Pb age, Ce^4+/Ce^3+ ratios and the geochemical features of the Machangqing complex associated with copper deposit[J].中国地球化学学报,2006,25(3):223-229.
作者姓名:梁华英  喻亨祥  莫测辉  张玉泉  谢应雯
作者单位:Key Laboratory for Metallogenic Dynamics Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China,Guilin Institute of Technology Guilin 541004 China,Department of Environmental Engineering Ji’nan University Guangzhou 510623 China,Key Laboratory for Metallogenic Dynamics,Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China,Key Laboratory for Metallogenic Dynamics,Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China
基金项目:This work was financially supported jointly by NSFG (No. 40472049), and CAS Key Project (KZCX2-SW-117 and GIGCX-04- 03).Acknowledgements The authors would like to acknowledge the Yunnan No. 3 Geological Team for its help in the fieldwork. Thanks are also due to Dr. Charlotte Allen for his help with the analysis of zircon age and constructive discussion.
摘    要:1IntroductionQuite a number of porphyry copper deposits havebeen found in the Cenozoic alkali-intrusions along theJinshajiang-Ailaoshan-Red River fault zone,whichconstitute the Cenozoic ore belt in China.The Cenozo-ic alkali-intrusive rocks are similar in…

关 键 词:  沉积物  锆石  地球化学

Zircon LA-ICP-MS U-Pb age, Ce4+ /Ce3+ ratios and the geochemical features of the Machangqing complex associated with copper deposit
Liang Huaying,Yu Hengxiang,Mo Cehui,Zhang Yuquan,Xie Yingwen.Zircon LA-ICP-MS U-Pb age, Ce4+ /Ce3+ ratios and the geochemical features of the Machangqing complex associated with copper deposit[J].Chinese Journal of Geochemistry,2006,25(3):223-229.
Authors:Liang Huaying  Yu Hengxiang  Mo Cehui  Zhang Yuquan  Xie Yingwen
Affiliation:(1) Key Laboratory for Metallogenic Dynamics, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China;(2) Guilin Institute of Technology, 541004 Guilin, China;(3) Department of Environmental Engineering, Ji’ nan University, 510623 Guangzhou, China
Abstract:The Machangqing complex is composed of early syenitic-monzonitic porphyry and late granite-porphyry. Geochemically, they are similar in major and trace element characteristics, and are characterized by relatively low TiO2 ( < 0.5) and P2O5 (< 0.4) and high alkali contents (K2O + Na2O > 8% ), with K2O/Na2O > 1, the absence of significant Eu anomaly and pronounced negative anomalies in Nb, Ta, Ti, and enrichment in large-ion lithophile elements and light rare-earth elements. Zircon U-Th-Pb ELA-ICP-MS age determination of the Machangqing complex has revealed two discrete igneous events. The syenitic-monzonitic porphyry has an age of 35. 6 ±3 Ma, MSWD = 2. 80 ; the granite-porphyry, 35. 0 ±0.2 Ma, MSWD =2.91. The lifespan of magmatic activities of the Machangqing complex associated with Cu + Mo mineralization is about 0.6 Ma. The late-stage ore-bearing granite-porphyry has higher Ce4+ /Ce3+ ratios (264) than the early-stage barren syenitic-monzonitic porphyry (102). The increase of zircon Ce4+ /Ce3+ ratios from the early-to late-stage porphyries indicates that the oxidation state of the magmas associated with copper mineralization increases with time. This work was financially supported jointly by NSFG ( No. 40472049), and CAS Key Project ( KZCX2-SW-117 and GIGCX-04-03).
Keywords:igneous petrology  porphyry copper  geochronology  Yunnan
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