图们市银洞子铅锌矿床地质特征及成因探讨

Discussion on geological characteristics and genesis of Yindongzi lead-zinc deposit in Tumen City

介绍了银洞子铅锌矿床成矿背景、矿体的空间赋存规律及特征。分析了地层、岩浆和构造控矿因素,即矿化围岩为大理岩、硅质大理岩及角岩;矿化与燕山期侵入岩有关;大部分矿化均赋存在背斜、向斜的轴部及其附近。区内硫同位素具有较好的均一性,反映了矽卡岩型矿床硫同位素的特征。认为该矿床为矽卡岩型矿床,矿区内的细脉浸染型及热液充填型矿化的出现是较晚期中温热液活动叠加的结果。

The metallogenic background, spatial occurrence regularities of orebody and geological characteristics of Yindongzi lead-zinc deposit are introduced. The ore controlling factors of the strata, magma and tectonic are analyzed, that is, the mineralized surrounding rock is marble, siliceous marble and homstone, the mineralization associated with the Yanshanian intrusive rocks, most mineralization occurs in the axis of anticline, syncline and near them. The sulfur isotope within the study region has a good homogeneity, which reflects a characteristic of sulfur isotope in skarn type deposit. It is considered that the deposit is a skam type deposit, there are the mineralization of the fine vein disseminated type and hydrothermal filling type in the mining area, they are he results of the superposition of the thermal fluid activity during the later period.