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题名: 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
作者: Tang, QY; Li, CS; Zhang, MJ(张铭杰); Lin, Y
收录类别: SCIE
出版日期: 2015-02
刊名: MINERALOGY AND PETROLOGY
卷号: 109, 期号:1, 页码:103-114
出版者: SPRINGER
出版地: WIEN
英文摘要: 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
通讯作者: Zhang, MJ (reprint author), Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China.
学科分类: Geochemistry & Geophysics; Mineralogy
文章类型: Article
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]
所属项目名称: 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
语种: 英语
DOI: 10.1007/s00710-014-0349-z
ISSN号: 0930-0708
WOS记录号: WOS:000348564900008
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/120665
Appears in Collections:地质科学与矿产资源学院_期刊论文

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Recommended Citation:
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.
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