东风山前寒武纪含铁建造金矿床的同位素地球化学特征

东风山金矿体赋存在含铁层之下的东风山群角岩层中。赋矿层位中富含磁黄铁矿、黄铁矿、锰铝榴石和锰铁闪石。通过对该矿床的硫、氧、碳和铅同位素研究，表明硫化物中的硫和地层铅主要来自深源，其次地层中的含硫有机物被生物分解形成的硫也产生一定影响。东风山群形成于早元古代。东风山金矿属高温热接触变质的同生床。

The Isotope Geochemical Characteristics of the Precambrian Iron bearing Formation Gold Deposit in Dongfengshan, Heilongjiang Province

Dongfengshan gold deposit is occured in hornstone of Dongfengshan group under iron bearing stratum. Ore-bearing stratum contain richly yrrhotite,pyrite,spessartine and dannemorite. Additionly, there are smaller arsenopyrite and cobaltite. The δ³⁴ S values of pyrrhotite and pyrite are -15.4‰～9.8‰ and -2.7‰～6.1‰，respectively. Sulfur of sulfide occurrence mainly from plutonic sourse. The δ¹⁸ O values of different rocks and minerals show following: marble 13.1‰～23.9‰, magnetite 4.1‰～10.5‰, quarts 13.7‰～20.9‰, grunerite 10.9‰～16.8‰, garnet 9.9‰～17.5‰. These δ¹⁸ O values reflect thermal contact metamorphic character of gold deposit .The δ¹⁸ O values of the Paleozoic granite obviously are of two groups:one is terrene granite in southern ore area ,its δ¹⁸ O values are 8.7‰～11.4‰；another is drill holl plutonic granite in northern ore area, its δ¹⁸ O values are 0.5‰～1.1‰. The granite from drill holl was strongly sericitized. Dongfengshan group was formed in early Proterozoic. Dongfengshan gold deposit is a high temperature thermal contact metamorphic syngenetic deposit.