云南省施甸东山铅锌矿地质特征及成矿成因探讨

东山铅锌矿区是云南保山隆阳―龙陵铅锌矿整装勘查区重要区块之一,位于近SN向的怒江断裂、柯街―大山断裂及NE向的南汀河断裂和勐波罗河断裂及NW向的瓦窑河―云县断裂派生次级特提斯成矿域。对区域成矿地质背景、矿床地质特征、构造特征、岩浆岩活动、矿石的类型,矿石的结构构造及化学组分等进行详细地研究,进而提出铅锌矿床的成因机制。结果表明:(1)该矿区二叠系下统沙子坡组下段(P1s1)为矿区主要含矿地层,香山组地层(C1x)在矿区北部的西邑矿区为含矿地层。(2)成矿可能与隐伏花岗岩有关,矿液来源于深部。推测东山炭质层以下存在类似西邑受地层及构造控制的喷流沉积型铅锌矿体。

Geological characteristics and metallogenic genesis of Dongshan Pb-Zn deposit in Shidian of Yunnan

Dongshan Pb-Zn mining area is one of the key blocks in Longyang-Longling Pb-Zn integrated explo-ration area,and it locates at secondary Tethyan metallogenic domain which is derived from nearly SN tren-ding Nujiang fault,Kejie-Dashan fault and NE trending Nanting River fault and Mengboluo River fault and NW trending Wayao River-Yunxian fault.After detailed study of regional metallogenic settings,geological characteristics of the deposit,structural characteristics,magmatic activities,types of ores,the author pro-poses a formation mechanism of Pb-Zn deposits.The results indicate that：1）the lower segment of Lower Permian Shazipo Formation （P1 s 1 ）in the mining area is the primary ore-bearing strata,and the strata of Xiangshan Formation （C1 x）in Xiyi mining area which locates at the north of the mining area is the ore-bear-ing strata;2）the mineralization is possibly related to concealed granite,and the ore fluid originates from the deep level.It is supposed that sedimentation-exhalation type Pb-Zn ore-bodies which is controlled by strata and structure exist below Dongshan carbon-bearing layer.