| Integration of zircon and apatite U–Pb geochronology and geochemical mapping of the Wude basalts(Emeishan large igneous province):A tool for a better understanding of the tectonothermal and geodynamic evolution of the Emeishan LIP |
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| 引用本文： | Jia-Nan Fu,Franco Pirajno,Fan Yang,Espine Shivute,Yi-Zhan Sun,Ning Ai,Kun-Feng Qiu. Integration of zircon and apatite U–Pb geochronology and geochemical mapping of the Wude basalts(Emeishan large igneous province):A tool for a better understanding of the tectonothermal and geodynamic evolution of the Emeishan LIP[J]. 地学前缘(英文版), 2021, 12(2): 573-585. DOI: 10.1016/j.gsf.2020.08.004 |
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| 作者姓名： | Jia-Nan Fu Franco Pirajno Fan Yang Espine Shivute Yi-Zhan Sun Ning Ai Kun-Feng Qiu |
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| 作者单位： | School of Earth Sciences and Resources;The University of Western Australia;Institute of Geophysical and Geochemical Exploration;Geological Survey of Ningxia |
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| 基金项目： | the National Natural Science Foundation of China(91962106,41702069);the National Key Research Program(2019YFA0708603);the Fundamental Research Funds for the Central Universities,China(2652018125);the 111 Project of the Ministry of Science and Technology,China(BP0719021);the China International Science and Technology Cooperation Award and the Overseas Experts Exchange Project of the Ministry of Science and Technology,China(G20190001257);the Beijing Nova Program(No.Z201100006820097);the National Natural Science Foundation of China. |
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| 摘 要： | Radiogenic isotopic dating and Lu–Hf isotopic composition using laser ablation-inductively coupled plasma-mass spectrometry(LA-ICP-MS)of the Wude basalt in Yunnan province from the Emeishan large igneous province(ELIP)yielded timing of formation and post-eruption tectonothermal event.Holistic lithogeochemistry and elements mapping of basaltic rocks were further reevaluated to provide insights into crustal contamination and formation of the ELIP.A zircon U–Pb age of 251.3±2.0 Ma of the Wude basalt recorded the youngest volcanic eruption event and was consistent with the age span of 251-263 Ma for the emplacement of the ELIP.Such zircons hadεHf(t)values ranging from7.3 to+2.2,identical to those of magmatic zircons from the intrusive rocks of the ELIP,suggesting that crust-mantle interaction occurred during magmatic emplacement,or crust-mantle mixing existed in the deep source region prior to deep melting.The apatite U–Pb age at 53.6±3.4 Ma recorded an early Eocene magmatic superimposition of a regional tectonothermal event,corresponding to the Indian–Eurasian plate collision.Negative Nb,Ta,Ti and P anomalies of the Emeishan basalt may reflect crustal contamination.The uneven Nb/La and Th/Ta values distribution throughout the ELIP supported a mantle plume model origin.Therefore,the ELIP was formed as a result of a mantle plume which was later superimposed by a regional tectonothermal event attributed to the Indian–Eurasian plate collision during early Eocene.
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| 关 键 词： | Emeishan basalt Zircon and apatite GEOCHRONOLOGY Lu-Hf isotope Early Eocene superposition Indian-Eurasian plate collision |
| 收稿时间： | 2020-05-13 |
Integration of zircon and apatite U-Pb geochronology and geochemical mapping of the Wude basalts(Emeishan large igneous province):A tool for a better understanding of the tectonothermal and geodynamic evolution of the Emeishan LIP |
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| Jia-Nan Fu,Franco Pirajno,Fan Yang,Espine Shivute,Yi-Zhan Sun,Ning Ai,Kun-Feng Qiu. Integration of zircon and apatite U-Pb geochronology and geochemical mapping of the Wude basalts(Emeishan large igneous province):A tool for a better understanding of the tectonothermal and geodynamic evolution of the Emeishan LIP[J]. Geoscience Frontiers, 2021, 12(2): 573-585. DOI: 10.1016/j.gsf.2020.08.004 |
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| Authors: | Jia-Nan Fu Franco Pirajno Fan Yang Espine Shivute Yi-Zhan Sun Ning Ai Kun-Feng Qiu |
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| Affiliation: | School of Earth Sciences and Resources,China University of Geosciences,Beijing,100083,China;School of Earth Sciences and Resources,China University of Geosciences,Beijing,100083,China;The University of Western Australia,35 Stirling Hwy,Crawley,WA,6009,Australia;Institute of Geophysical and Geochemical Exploration,CAGS,Langfang,065000,China;Geological Survey of Ningxia,Yinchuan,Ningxia,750021,China |
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| Abstract: | Radiogenic isotopic dating and Lu–Hf isotopic composition using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) of the Wude basalt in Yunnan province from the Emeishan large igneous province (ELIP) yielded timing of formation and post-eruption tectonothermal event. Holistic lithogeochemistry and elements mapping of basaltic rocks were further reevaluated to provide insights into crustal contamination and formation of the ELIP. A zircon U–Pb age of 251.3 ?± ?2.0 ?Ma of the Wude basalt recorded the youngest volcanic eruption event and was consistent with the age span of 251–263 ?Ma for the emplacement of the ELIP. Such zircons had εHf(t) values ranging from ?7.3 to +2.2, identical to those of magmatic zircons from the intrusive rocks of the ELIP, suggesting that crust-mantle interaction occurred during magmatic emplacement, or crust-mantle mixing existed in the deep source region prior to deep melting. The apatite U–Pb age at 53.6 ?± ?3.4 ?Ma recorded an early Eocene magmatic superimposition of a regional tectonothermal event, corresponding to the Indian–Eurasian plate collision. Negative Nb, Ta, Ti and P anomalies of the Emeishan basalt may reflect crustal contamination. The uneven Nb/La and Th/Ta values distribution throughout the ELIP supported a mantle plume model origin. Therefore, the ELIP was formed as a result of a mantle plume which was later superimposed by a regional tectonothermal event attributed to the Indian–Eurasian plate collision during early Eocene. |
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| Keywords: | Emeishan basalt Zircon and apatite Geochronology Lu–Hf isotope Early Eocene superposition Indian–Eurasian plate collision |
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