Abstract:

Gold deposits in Jinchengdong area can be devided into two types,one occur late-Archean metamorphicrocks,another occur granitic entrusives.Gold abundance analyses show that the background value of metamorphic rocks is 2.04×10^-9,the value of the Mesozoic monozonites is 66.07×10^-9,the other granites have low gold abundance.The dissolved experiment of different rocks show that the gold of plaiogoamphioble,monozonite and lamprophyre is easily dissolved,and provide partial ore-forming materials for gold deposits,but it is difficult to dissolve the gold of other rocks.The different rocks have the unifrom sulfar isotope composition and similar with chronide values,this indicates ore-forming materials are from abyssal resoures. Rare earth element curves of differient rocks are parallel,charactered with LREE enrichment and little Eu anomoly,this feature indicates these rocks have the similar resources.Lead isotope of the rocks(ores) plot in area between u=8.5 and u=9.58 line,this further indicate the ore-forming materials come from abyssal resoures(under crust or upper matle).

Key words: Material Resources, Gold Deposits, Jin ChengDong, Jilin Provin