东风山前寒武纪含铁建造金矿床的同位素地球化学特征  

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

作　　者：魏菊英[1] 曾强[1] 

机构地区：[1]北京大学地质学系

出　　处：《北京大学学报（自然科学版）》1996年第4期472-480,共9页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：国家自然科学基金

摘　　要：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。Dongfengshan gold deposit is occured in hornstone of Dongfengshan group under iron bearing stratum. Ore bearing stratum contain richly pyrrhotite,pyrite,spessartine and dannemorite. Additionly, there are smaller arsenopyrite and cobaltite. The δ 34 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 δ 18 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 δ 18 O values reflect thermal contact metamorphic character of gold deposit .The δ 18 O values of the Paleozoic granite obviously are of two groups:one is terrene granite in southern ore area ,its δ 18 O values are 8.7‰～11.4‰;another is drill holl plutonic granite in northern ore area, its δ 18 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.

关 键 词：同位素组成 同生矿床 金矿床 同位素地球化学 

分 类 号：P618.510.5[天文地球—矿床学]