广西大厂矿田拉么锌铜矿床成矿期次和成矿阶段划分

The Metallogenic Period and Metallogenic Stages Dividing in the Lame Zinc-copper Deposit of the Dachang Ore Field,Guangxi

拉么矿床位于大厂矿田中矿带笼箱盖岩体的南西侧，该矿床既存在矽卡岩型锌铜矿化，又存在中～低热液型钨-锑矿化．矽卡岩型锌铜矿化，根据产状特征可分为两组：似层状矿化、脉状矿化；同时可分为三种类型：缓倾斜似层状锌铜矿化，陡倾斜裂隙充填、交代细脉状矿化，以及陡倾斜大脉状矿化．通过坑下地质调研和室内光片鉴定，拉么锌铜矿矿区的成矿作用可划分为两个成矿期、5个成矿阶段：①矽卡岩型锌（铜）矿成矿期，包括早期硫化物阶段（铁铜矿阶段）、晚期硫化物阶段（铅锌矿阶段）；②钨一锑成矿期，包括星散浸染状白钨矿矿化阶段、星散浸染状辉锑矿矿化阶段、脉状辉锑矿一方解石矿化阶段．

Lame deposit is located in the southwestern side of the Dachang ore field the belt Longxianggai rock mass, the deposit both skarn-type zinc-copper mine, and there is a medium-low hydrothermal tungsten-antimony mineralization. Skarn-type zinc-copper mineralization can be divided into two groups according to the characteristics of occurrence： stratiform mineralization and vein mineralization, at the same time, can be divided into three types： gently inclined stratiform zinc copper mineralization, steeply dipping fissure filling and account of the fine stockwork mineralization, steeply inclined vein mineralization. Through the pit following geological research, and the indoor light chip identification, the mineralization of Lame zinc-copper mine is divided into two mineralization periods and the five stages of mineralization： ①the skarn rock type zinc （copper） mineralization period, induding the early stages of sulphide （iron, copper stage）, and the late stages of sulphide （pb-zn phase） ; ②tungsten-antimony mineralization period, including the scattered disseminated scheelite mineralization stages, scattered disseminated stibnite mineralization stage and vein stibnite mineral-calcite mineralization stage.