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J4 ›› 2010, Vol. 16 ›› Issue (4): 436-447.

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Zircon U-Pb Geochronology and Hf Isotopic Compositions of Hehuaping Granite Porphyry, Southern Hunan Province, and its Geological Significance

ZHANG Rong-qing  LU Jian-jun  ZHU Jin-chu  YAO Yuan   

  1. State Key Laboratory for Mineral Deposits Research, School of Earth Scences and  Engneering, Nanjing University, Nanjing 210093, China
  • Received:2010-05-28 Revised:2010-09-08 Online:2010-12-20 Published:2010-12-20


The Hehuaping granite porphyry  is  located  to  the southeast of Wangxianling granite and  there are cassiterite-sulfide type, porphyry type and altered fragmented-rock type tin deposits related to granite porphyry. Zircon LA-MC-ICP-MS U-Pb age for granite porphyry is 154~156 Ma, with a weighted mean age of (154.7±0.5) Ma (MSWD=0.085, n=21), which suggests an early Yanshanian emplacement. The  in situ Hf  isotope analysis reveals 176Hf/177Hf ratios  from 0.282403  to 0.282597,and ε Hf ( t )  from -2.84 to -10.14 (peak value around -6.5), and the two stage Hf model ages ( tDM2) ranging from 1.38 Ga to 1.84 Ga (peak value around 1.55 Ga),which indicates that its parental magma was derived from the mixed sources of the lower crust and mantle. Based
on several age data of inherited zircons from the tin-bearing granites in the neighbouring Nanling Range, it can be concluded that
the granitoids related to tin deposits were mainly products of remelting of the Mesoproterozoic basement rocks

Key words:  Zircon U-Pb geochronology, Hf isotope, granite porphyry, Hehuaping

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