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《Journal of Geomechanics》 2017-05
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METALLOGENIC AGES AND THE NATURE OF MAGMA SOURCE OF THE YUJIASHAN CU-NI DEPOSIT,HANNAN COMPLEX:CONSTRAINTS FROM ZIRCON U-PB DATING AND LU-HF ISOTOPE

ZHENG Guanggao;CUI Jianjun;LIU Xiaochun;QIAO Jianxin;QU Wei;CHEN Longyao;LI Miao;ZHAO Wenping;LI Dongdong;Institute of Geomechanics,Chinese Academy of Geological Sciences;School of Earth and Space Sciences,Peking University;Shannxi Mining Industry & Trade Company;The Second Branch Company,Shaanxi Geological and Mineral Survey and Development Corporation;  
The Yujiashan Cu-Ni deposit of Hannan complex is located in the southwest of the Wangjiangshan basic massif,in the west of the northern margin of the Yangtze craton.There is less study on the diagenesis age,mineralization age and the nature of magma source of the outcropped rock mass,which affects the understanding of the deposit genesis.The data of LA-ICP-MS zircon U-Pb dating and in-situ Lu-Hf isotope of the typical outcropped ore-bearing and surrounding rocks were analyzed in the study.The results show that the mineralization age is about or a little late than(791±4)Ma,and the diagenesis age is about(808±6.8)Ma.Furthermore,the in-stiu zircon Hf isotopic analysis indicates that theεHf(t)values of ore-bearing rock range from +9.5~+10.9,with an average value of+10.7 and Hf model ages ranging from 924 Ma to 974 Ma;theεHf(t)values of surrounding rock range from +8.7~+11.1,with an average value of 9.9 and Hf model ages ranging from 924 Ma~974Ma.Coupled with the available published data,it is proposed that the basic massif of the Yujiashan Cu-Ni deposit maybe derived from the partial melting of depleted mantle materials of late Middle Proterozoic-Neoproterozoic age in the active continental margins setting.
【Fund】: 中国地质科学院地质力学研究所基本科研经费(DZLXJK201302);; 陕西省矿产资源勘查与综合利用重点实验室基金(地合字201401);; 中国地质调查局地质调查项目(121201104000160916)
【CateGory Index】: P618.41;P618.63
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