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《Geoscience》 2018-01
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Geochemistry,Zircon U-Pb Geochronology and Hf-Sr-Nd Isotopic Characteristics of the Rhyolite Porphyry at Heyuanbei in Xiangshan Uranium Ore-field,Jiangxi Province

SI Zhifa;LI Ziying;NIE Jiangtao;LIU Jungang;WANG Jian;TIAN Mingming;Beijing Research Institute of Uranium Geology,CNNC;Key Laboratory of Uranium Resource Exploration and Evaluation Technology,CNNC;  
A suite of rhyolite porphyry was found at Heyuanbei in Xiangshan uranium ore-field of Jiangxi Province,which intruded into the rhyodacite,tuff,argillaceous siltstone. LA-ICP-MS U-Pb isotopic dating on zircons from the rhyolite porphyry yields magmatic crystallization age of( 131. 8 ± 0. 7) Ma( MSWD = 0. 41). The rhyolite porphyry is characterized by high in SiO_2,K_2O,Al_2O_3 and relatively low in MnO and P_2O_5. It is enriched in Rb,Th,U,La,Ce,Nd and light rare earth elements,depleted in Ba,Nb,Sr,P and Ti,and shown slightly negative Eu anomalies( δEu =0. 21-0. 25). The zircon ε_(Hf)( t) values range from -6. 77 to -10. 38,with Hf depleted mantle model ages( T_(DMC)) between 1 619 and 1 846 Ma. The I_(Sr)values range from 0. 710 92 to 0. 712 01. And the ε_(Nd)( t) values range from -8. 18 to -9. 19. The experimental results indicate that the rock was generated by partial melting of crustal rocks during extension in Lower Cretaceous. And a sub-volcanic conduit may exist in the west of Xiangshan.
【Fund】: 中核集团科技创新示范工程项目(LCD116)
【CateGory Index】: P619.14
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