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《Geological Science and Technology Information》 2006-02
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Geochemistry and Petrogenesis of Cretaceous High Sr and Low Y Granodiorite Pluton in Fangshan Area, Beijing

TAO Ji-dong~(1a),ZHANG Chao~(1a),MA Chang-qian~(1b,1c),YANG Kun-guang~(1b),ZHOU Hong-sheng~2(1a.Graduate School;1b.Faculty of Earth Sciences;1c.State Key Lab oratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China;2.Department of City & Environmental Science,Xinyang Normal University,Henan Xinyang 464000,China)  
The geochemical characteristics of Fangshan granodiorite pluton and its enclaves are similar to those of typical adakite,with high w(Sr),w(Sr)/w(Y),and w(La)_N/w(Yb)_N,low w(Y) and w(Yb),Sr positive anomaly and Eu weakly abnormally or positive anomaly.Their Sr-Nd isotopes are similar to those of the Mesozoic igneous rocks from North China craton and the lower continental crust xenoliths formed by the underplated basalts from Hannuoba area during 160-140 Ma.It is suggested that: ①Fangshan granodiorite pluton and its enclaves were formed by partial melting of the thickened lower curst;②The bottom of thickened lower crust was the underplating basalt with the EMI characteristic,which was part of the new lower crust produced by thinning and replacement of North China craton.
【Fund】: 国家自然科学基金资助项目(40334037)
【CateGory Index】: P588.12
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