Crust-derived felsic magmatism in the Emeishan large igneous Province:New evidence from zircon U-Pb-Hf-O isotope from the Yangtze Block,China

作     者：Hao Zou Cheng-Hui Hu M.Santosh Hai-Feng Chen Chang-Cheng Huang Xin-Wei Chen Hong-Kui Li Xin Jin Li-Ming Yu Min Li Hao Zou;Cheng-Hui Hu;M.Santosh;Hai-Feng Chen;Chang-Cheng Huang;Xin-Wei Chen;Hong-Kui Li;Xin Jin;Li-Ming Yu;Min Li

作者机构：State Key Laboratory of Oil and Gas Reservoir Geology and ExploitationChengdu University of TechnologyChengdu 610059China Key Laboratory of Tectonic Controls on Mineralisation and Hydrocarbon Accumulation of Ministry of Land and ResourcesChengdu University of TechnologyChengdu 610059China School of Earth Sciences and ResourcesChina University of GeosciencesBeijing 100083China Department of Earth ScienceUniversity of AdelaideAdelaideSA 5005Australia 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2022年第13卷第3期

页      面：139-155页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：The Everest Scientific Research Program of Chengdu University of Technology  China financially supported this study 

主　　题：Emeishan Large Igneous Province Mafic and felsic magmatism Zircon U-Pb-Hf-O isotopes Crustal partial melting Mantle plume 

摘      要：Numerous intrusive bodies of mafic–ultramafic to felsic compositions are exposed in association with volcanic rocks in the Late Permian Emeishan large igneous province(ELIP),southwestern *** of the granitic rocks in the ELIP were derived by differentiation of basaltic magmas with a mantle connection,and crustal magmas have rarely been *** we investigate a suite of mafic dykes and Ⅰ-type granites that yield zircon U-Pb emplacement ages of 259.9±1.2 Ma and 259.3±1.3 Ma,*** εHf(t)values of zircon from the DZ mafic dyke are–0.3 to 9.4,and their corresponding TDM1 values are in the range of 919–523 *** εHf(t)values of zircon from the DSC Ⅰ-type granite are between–1 and 3,with TDM1 values showing a range of 938–782 *** also present zircon O isotope data on crust-derived felsic intrusions from the ELIP for the first *** δ18O values of zircon from the DSC Ⅰ-type granite ranges from 4.87‰to 7.5‰.The field,petrologic,geochemical and isotopic data from our study lead to the following salient findings.(i)The geochronological study of mafic and felsic intrusive rocks in the ELIP shows that the ages of mafic and felsic magmatism are similar.(ii)The DZ mafic dyke and high-Ti basalts have the same source,i.e.,the Emeishan mantle *** mafic dyke formed from magmas sourced at the transitional depth between from garnet-lherzolite and spinel-lherzolite,with low degree partial melting(10%).(iii)The Hf-O isotope data suggest that the DSC Ⅰ-type granite was formed by partial melting of Neoproterozoic juvenile crust and was contaminated by minor volumes of chemically weathered ancient crustal material.(iv)The heat source leading to the formation of the crust-derived felsic rocks in of the ELIP is considered to be mafic–ultramafic magmas generated by a mantle plume,which partially melted the overlying crust,generating the felsic magma.