U-Pb age and Hf isotopes of zircon from basaltic andesite and geochemical fingerprinting of the associated picrites in the Emeishan large igneous province, SW China
Tang, QY; Li, CS; Zhang, MJ(张铭杰); Lin, Y; Zhang, MJ (reprint author), Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China.
收录类别SCIE
2015-02
发表期刊MINERALOGY AND PETROLOGY
卷号109期号:1页码:103-114
出版者SPRINGER
出版地WIEN
摘要The ages of many picrites associated with Permian flood basalts in the Emeishan large igneous province, SW China have been debated for a long time. Some researchers believe that these picrites are co-magmatic with the flood basalts whereas others believe that they are Triassic picritic porphyrites or Cenozoic olivine-rich dikes. We report a U-Pb age of 256.2 +/- 1.4 Ma for the youngest zircon grains from the Binchuan volcanic sequence which contains the disputed picrites. This age is within the range of values reported for the intrusive and extrusive rocks of the Emeishan large igneous province. The epsilon(Hf) values (-0.3 to 6.6) of the youngest zircon crystals from the Binchuan volcanic sequence are similar to those (-5 to 10) of co-magmatic zircon crystals from the intrusive rocks of the Emeishan large igneous province. Our new data confirm that the Binchuan volcanic sequence is an integral part of the Emeishan large igneous province. The disputed and undisputed picrites in Sichuan and Yunnan have similar olivine Fo-Ni-Mn compositions and whole-rock incompatible trace element ratios such as Th/Nb and Ti/Dy. This, together with their spatially close association with the Emeishan flood basalts, indicates that the disputed picrites also belong to the Emeishan large igneous province. The confusing Cenozoic olivine-rich dikes in the region can be distinguished from the picrites of the Emeishan large igneous province by their different olivine Fo-Ni-Mn compositions and whole-rock incompatible trace element ratios such as Th/Nb and Ti/Dy. The results from this study vindicate the use of the previously-disputed picrites as evidences for Permian mantle plume activity in SW China.
作者部门[Tang, Qingyan;
Zhang, Mingjie;
Lin, Yao] Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China;
[Tang, Qingyan;
Zhang, Mingjie;
Lin, Yao] Lanzhou Univ, Gansu Key Lab Mineral Resources Western China, Lanzhou 730000, Peoples R China;
[Li, Chusi] Chinese Acad Sci, State Key Lab Ore Deposit Geochem, Inst Geochem, Guiyang 550002, Peoples R China;
[Li, Chusi] Indiana Univ, Dept Geol Sci, Bloomington, IN 47405 USA
学科领域Geochemistry & Geophysics ; Mineralogy
所属项目编号National Science Foundation of China [41072056, 40973039] ; Key Laboratory of Western China's Mineral Resources of Gansu Province in Lanzhou University [WCRMGS-2014-04] ; China Geology Survey [12120114044401] ; CAS/SAFEA International Partnership Program for Creative Research Teams [KZZD-EW-TZ-20] ; China Scholarship Council [201206180107]
资助项目国家自然科学基金项目 ; 国家留学基金委项目 ; 中央高校基本科研业务费专项资金
项目资助者NSFC ; CSC ; LZU
DOI10.1007/s00710-014-0349-z
ISSN0930-0708
文章类型Article
语种英语
WOS记录号WOS:000348564900008
第一机构
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文献类型期刊论文
条目标识符http://ir.lzu.edu.cn/handle/262010/120665
Collection地质科学与矿产资源学院
通讯作者Zhang, MJ (reprint author), Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China.
Recommended Citation:
GB/T 7714
Tang, QY,Li, CS,Zhang, MJ,et al. U-Pb age and Hf isotopes of zircon from basaltic andesite and geochemical fingerprinting of the associated picrites in the Emeishan large igneous province, SW China[J]. MINERALOGY AND PETROLOGY,2015,109(1):103-114.
APA Tang, QY,Li, CS,Zhang, MJ,Lin, Y,&Zhang, MJ .(2015).U-Pb age and Hf isotopes of zircon from basaltic andesite and geochemical fingerprinting of the associated picrites in the Emeishan large igneous province, SW China.MINERALOGY AND PETROLOGY,109(1),103-114.
MLA Tang, QY,et al."U-Pb age and Hf isotopes of zircon from basaltic andesite and geochemical fingerprinting of the associated picrites in the Emeishan large igneous province, SW China".MINERALOGY AND PETROLOGY 109.1(2015):103-114.
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