吉林省伊通县小桥子银多金属矿点矿化地质特征及找矿方向

Mineralization geologic feature and prospecting direction of silver polymetallic ore spot in Xiaoqiaozi village of Yitong County, Jilin Province

吉林省伊通县小桥子银多金属矿点地处大黑山断隆的中段.即吉黑成矿省,小兴安岭-张广才岭-吉林哈达岭太古宙、晚古生代、中生代铁金铜镍银铅锌成矿带;山门放牛沟银多金属成矿带;放牛沟Pb、Zn成矿远景区。矿体产于华力西早期花岗闪长斑岩与石缝组大理岩接触带中,受东西向层间挤压破碎带控制,含矿围岩为奥陶系石缝组大理岩。矿石矿物有:辉银矿、方铅矿、闪锌矿、孔雀石。围岩蚀变有:硅化、石榴石、黄铁矿化、绿泥石化、透闪石化、绢云母化、方解石等。矿床成因初步认为属热液接触交代--矽卡岩型矿床。所以,区内地层与岩浆岩接触带及构造破碎带是本区的有利找矿部位。

The silver polymetallic ore spot of Xiaoqiaozi village in Yitong County, Jilin Province, is located in the middle of Daheishan mountain fault uplift, which is the mineralization of the Jilin and Heilongjiang, the Archean, Late Palaeozoic, Mesozoic iron-gold-copper-nickel-silver-lead-zinc metallogennic belt of Jilin Hada ridge; Silver polymetallic ore belt of the Fangniugou in the Shanmen Town; Pb-Zn metallogenic prospect area in the Fangniugou. The ore body was made in the marble joint between the Early Variscian Epoch of granodiorite and the Shifeng Group, which is controlled by the crushing and crushing zone between the east and west layers, the ore surrounding rock is the Shifeng Group of Ordovician Systen. The ore minerals are argentite, galena, sphalerite and malachite. The wall rock alteration includes silication pyritization, choritization, tremolite of petrochemical, sericitization and calcilization. Initially consider that genesis of mineral deposit is belong to hydrothermal metasomatic type-skarn deposit. Therefore, strata, magmatic contact zone and structural fracture zone in the area are favorable area for prospecting sites.