The Evolution of Relin Uplex Rock Masses in Yanshan Phase and Ar-Ar Dating Age and Copper-molybdenum Mineralization Characteristics of Zhongdian Volcanic-magma Arc

The Relin composite rock body along the northeast margin of Gezhavolcanic-magmatic island arc of Zhongdian can be divided into 4intrusive bodies of fine grained quasi-porphyritic adamellite,medium grained quasi-porphyritic adamellite and adamelite porphyry of marginal complementary phase from the earlier to the later and from the margin to the center,Which form a cognate magmatic fine grained-medium grained-porphyritic structural evolution series.The petrochemistry,REE and trace element of rock body generally show the characteristics of syntactic granite.There is the metallogenesis of veinlet pyrite and nodular molybdenite in the marginal fine grained granite and the inner zone of hornfels.And the hydrothermal filling metasomatic metallogenesis of molybdenite takes place in the medium grained granite of central part.We have the Ar-Ar isotopic isochron age 81.7±1.1Ma,plateau age 82.01±0.86 Ma of Relin Ⅱ medium grained quasi-porphyritic biotite adamellite.