Abstract:

Magmatic activities in the Naoniushan-Julihe copper polymetallic ore belt are mainly composed of two structural cycles，i.e．structural cycle in late Variscan period and early Yanshanian period．The ore-forming ages of the discovered copper polymetallic deposits are dominantly early Yanshanian period，and metallogenesis are related to intrusive rocks in early Yanshanian period，especially to hypabyssal-supper hypabyssal intermediate-acidic and acidic rocks. Total content of rare earth elements in volcanic-subvolcanic rocks in the area is low，and the ratio of ΣCe toΣY is high(2.7 to 14.1)，and Eu anomaly is little．These rocks，which originated from upper mantle to lower crust，belong to calcic-alkalic rock series
that are rich in Si，K and poor in Fe，Mg. Ore-forming elements and associated elements，such as Bi，W，
Sn，Ag，Pb，Cu are characterized by high abundance value，which provide ore-forming material sources for
the copper polymetallic ore belt．

Key words: intrusive and volcanic rock, geochemical characteristic, copper polymetallic ore belt, eastern Inner Mongolia