关键词: 含铁建造, 同位素组成, 同生矿床

Abstract: 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.

Key words: ironbearing formation, isotope composition, syngenetic deposit