江苏栖霞山铅锌银多金属矿床硅钙面控矿特征研究及其找矿意义

The characteristics and prospecting significance of silicon-calcium surface ore-controlling in Qixiashan lead-zinc-silver polymetallic deposit,Jiangsu province

江苏栖霞山铅锌银多金属矿床是当前华东地区规模最大的铅锌银多金属矿床,自发现铅锌矿以来,众多地质工作者对栖霞山矿区的勘探和综合研究工作没有停止过,对于矿床的成因认识,至今仍众说纷纭,归纳起来主要有4种,即深源岩浆热液成因、火山(次火山)热液成因、同生沉积成因、层控-热液复成成因。栖霞山铅锌银多金属矿床矿体围岩主要为碎屑岩(砂岩、石英砂岩、页岩等硅铝质岩石)+碳酸盐岩(灰岩、白云质灰岩等钙质岩石)组合。经过研究,认为该矿床中的大部分矿体并非受具体层位控制,而是受硅钙面控制,矿床应属于受硅钙面控制的特殊的岩浆期后中低温热液矿床。厘清硅钙面在成矿作用过程中的具体作用,对于指导该矿床的成矿理论研究和深部找矿工作具有十分重要的意义。

The Qixiashan lead-zinc-silver polymetallic deposit is the largest one of this type of deposits in the East China.There are still four statements about the knowledge of the deposit genesis,they are respectively:Deep source magmatic hydrothermal genesis,Volcano(or sub-volcano)hydrothermal genesis,Syngenetic sedimentary genesis,the stratabound hydrothermal genesis.The deposit is mainly hosted by clastic rocks consisting of sandstone,quartz sandstone,and shale,and carbonate rocks including limestone and dolomitic limestone.Our studies indicate that the Qixiashan deposit is controlled by the Silicon-Calcium Surface rather than by the strata.This deposit is a post magmatic mesothermal epithermal and SiliconCalcium Surface controlled deposit.The identification of the role of silicon-calcium surface in ore formation is of importance to develop the metallogenic model and aid in Deep Prospecting.