内蒙古双尖子山银铅锌矿床地质特征及矿床成因探讨

双尖子山银铅锌矿床位于大兴安岭南段,银资源储量达到超大型规模,是我国目前查明的最大银矿床。矿体主要赋存于兴隆山断裂构造带中的二叠系中统大石寨组上段板岩及变质粉砂岩中,含矿岩石具有全岩矿化的特征,构成了一条总体呈北西向展布、向南西陡倾斜的巨大的银铅锌矿化体。矿化体内部有北西向矿体群与北东向矿体,二者构成不对等的格子状矿体群,其中北西向矿体数量多且规模大、呈密集的近平行带状展布,一般呈似层状、脉状,连续性好;北东向矿体数量少且规模一般较小、矿体呈稀疏的近平行状展布,一般呈透镜状断续产出,连续性较差。矿石工业类型属于原生银铅锌矿石。矿床为构造裂隙充填型中低温热液脉状银铅锌矿床。

The geological features and genesis of Shuangjianzi mountain silver-lead-zinc deposit,Inner Mongolia

The Shuangjianzi Mountain silver-lead-zinc deposit in southern Da Hinggan Mountains, with its reserves of silver reaching superlarge size, which is the largest silver deposit ever discovered in China. The orebodies are hosted by the slate and metamorphic siltstone of the Middle Permian Dashizhai Formation in the Xinglong Mountain faulted structure zone. The ore-bearing rocks are whole-rock mineralization, forming a huge silver-lead-zinc mineralized body, which is northwestward distribution and incline to southwest steeply. The north-west orebodies and north-east orebodies in the mineralized body together constitute an unequal lattice ore body group.The number and scale of north-west orebodies are larger. The orebodies occurring as layered, vein, and continuous, dense and nearly parallel banded. The north-east orebodies are smaller in number and scale, distributed nearly parallel manner, which are sparse, lenticular and incontinuous. The ore industry type is primary silver lead zinc ore. The deposit belongs to the middle-low temperature hydrothermal vein silver-lead-zinc type with structural fracture filling.