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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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Geoscience Frontiers 2021年第2期12卷 573-585页

作者： Jia-Nan Fu Franco Pirajno Fan Yang Espine Shivute Yi-Zhan Sun Ning Ai Kun-Feng Qiu School of Earth Sciences and Resources China University of GeosciencesBeijing100083China The University of Western Australia 35 Stirling HwyCrawleyWA6009Australia Institute of Geophysical and Geochemical Exploration CAGSLangfang065000China Geological Survey of Ningxia YinchuanNingxia750021China

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 *** 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 *** zircons hadε_(Hf)(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 *** 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 *** Nb,Ta,Ti and P anomalies of the Emeishan basalt may reflect crustal *** uneven Nb/La and Th/Ta values distribution throughout the ELIP supported a mantle plume model ***,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.

关键词： Emeishan basalt zircon and apatite Geochronology Lu-Hf isotope Early Eocene superposition Indian-Eurasian plate collision

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