pt" class=MsoNormal>rif’" lang=EN-US>///Duobuza porphyry copper-gold deposit is a newly discovered deposit, which is located in the middle of Tibet plateau and in the west of Bangonghu-Nujiang metallogenic belt. K-feldspar from the potassic alteration zone was analyzed by ⁴⁰Ar/³⁹Ar dating technique, and these results yielded a plateau age of (118.31±0.60) Ma and a reverse isochron age of (118.30±0.79) Ma with initial ⁴⁰Ar/³⁶Ar=291±17, indicating that potassic alteration age in Duobuza porphyry deposit ranges from 119 to 118 Ma and coincide with the mineralization age (molybdenite Re-Os age, 119~118 Ma). The magmatic-hydrothermal evolution of Duobuza deposit should be from magmatic stage (around 120 Ma) to potassic alteration and mineralization (119~118 Ma), then to phyllic alteration(118~115 Ma), and the duration of magmatic-hydrothermal evolution probably persisted 5 million years.rif’; FONT-SIZE: 14pt" lang=EN-US>pace prefix = o ns = "urn:schemas-microsoft-com:office:office" />p>p>