江苏栖霞山铅锌银多金属矿床成矿时代探讨

Discussion on the mineralogenetic epoch of the Qixiashan lead-zinc-silver polymetallic deposit,Jiangsu Province

江苏栖霞山铅锌银多金属矿床是长江中下游铁、铜、铅锌、金多金属成矿带宁镇矿集区规模最大的铅锌多金属矿床。自发现铅锌矿以来,众多地质工作者针对栖霞山铅锌银多金属矿床的勘探和综合研究做了大量的工作,但由于在矿区范围内尚未发现与成矿相关的岩体,且缺乏适合于传统同位素定年方法的矿物,因此尚无法确定该矿床具体的成矿时代。本文基于矿床地质特征、区域成矿规律及矿床构造控矿规律的综合对比研究,初步认为栖霞山铅锌银多金属矿床成岩与成矿作用是与宁镇地区燕山晚期主要中酸性侵入岩形成时间同期连续发生的,大致推断其成矿作用应发生在110M^100Ma左右,属早白垩世晚期产物。

The Lead-Zinc-Silver polymetallic deposit in Qixiashan,Jiangsu,which is the largest LeadZinc polymetallic deposit in the area of theMiddle-Lower Yangtze River Valleymetallogenic belt,in Ningzhen ore concentration areas.Since the discovery of Lead-Zinc polymetallic deposit,so many geologists have done a lot of work on the exploration and comprehensive research of Qixiadeposit.However,due to the lack of the Ore-Bearing Granitic Intrusion,and the lack of the mineral,which is suitable for the traditional isotopic dating method,so it is unable to determine the specific metallogenic epoch of the deposit.This paper based on the comprehensive comparative study of the geological characteristics,regional metallogenic regularity and ore-controlling tectonics regularity of the deposit,we initially consider the petrogensis and metallogenyof QixiashanLead-Zinc-Silver polymetallic depositis a form of continuous occurrence time as same as the intermediate-acid intrusive rocks in Ningzhen area,period of LateYanshan Epoch.The mineralization of the QixiashanLead-Zinc-Silver polymetallic deposit is concluded in the about 110M^100Ma,belonging to a product of Late Period of Early Cretaceous.