YU Yong1，LI Xiao-feng2，XIAO Rong3，MAO Wei2，JIA Yi-zhen1
(1. College of Earth Sciences, Guilin University of Technology, Guilin 541004, China;
2. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
3. Hunan Institute of Geology Survey, Changshao 410116, China)
Abstract: The Shanhu orefield, one of the typical concentrated ore deposit areas of the Nanling W-Sn metallogenic belt, is located in the southwestern edge of the Guangxi Guposhan-Huashan pluton. Yantianling granite is the only outcrop stock exposed in the orefield. However, the diagenetic relationship between the granite intrusion and how the mineralization of the Shanhu orefield occurred is unclear. This study dated the ages of the Yantianling granite using LA-ICP-MS zircon U-Pb method and the sericite 40Ar-39Ar fast-neutron activation dating technique. Results show that the zircon U-Pb mean age is 106±13 Ma, and the sericite 40Ar-39Ar plateau age and the isochron age are 103.6±1.2 Ma and 103.9±2.1 Ma, respectively. The zircon U-Pb age of the granite indicate the intrusion of Yantianling granite occurred in the later stage of the early Cretaceous, representing the end of the magmatic evolution in the Guposhan-Huashan area. Moreover, the zircon U-Pb age of the granite is also consistent with the sericite 40Ar-39Ar plateau age of the mineralization at the Changyingling W-Sn deposit, suggesting that the formation of the Shanhu orefield is likely related to the intrusion of Yantianling granite.
Key words：zircon U-Pb age; 40Ar-39Ar dating; altered granite; Shanhu orefield; Yantianling; Guangxi Province
ACTA MINERALOGICA SINICA Vol. 34, No. 3, 2014, Page 297-306
