伊通放牛沟多金属硫铁矿床地质特征

吉林伊通放牛沟硫铁矿是吉林省三大硫铁矿之一,规模中型。伊通放牛沟多金属硫铁矿产于以海相火山-沉积为主的地层中。属于海底火山-沉积型热水喷流型多金属矿床。矿体赋存在奥陶系上统石缝组中;矿床成因主要特点是:①层控矿;②海相火山活动与成矿物质来源关系密切;③硫同位素测定资料接近陨石硫,与日本黒矿相近;④Co/Ni比值>1,亦与日本黒矿相近,具有海底热流沉积的块状硫化物矿床面貌;⑤包体测温为320~370℃,PH值为7.5~7.7,Eh值为140~225 mv。为中温弱碱性环境下形成。

Geological characteristics of polymetallic pyrite deposit in Fangniugou,Yitong

Yitong Fangniugou polymetallic pyrite mine is one of the three major pyrite mines in Jilin Province, medium scale. Formed in marine volcanic-sedimentary strata, it mainly belongs to the polymetallic deposits of the type of submarine volcanic exhalation sedimentation. The ore bodies are located in the Shifeng Formation of upper Ordovician System. The main genetic characteristics of the deposit are:① It is strata-bound deposit;②Marine volcanic activities are closely related to the source of the ore-forming material;③ The determination data of sulfur isotopes issimilar to that in the meteorite sulfur and the Kurokoin Japan;④ The cobalt-nickel ratio is greater than 1, which is also similar to the Kuroko in Japan and characterized by the features of massive sulfide deposits deposited by submarine thermal flow;5.The inclusion thermometry is 320-370°C, the PH value is 7.5-7.7, and the Eh value was 140-225 mv, it is formed in the environment of medium temperature and weak alkaline.