鲁西铜石地区金成矿预测靶区矿体埋藏深度估算及其意义

摘要

Tongshi is located in the west of Yishu fault western Shandong uplift area,also it is a newly discovered gold-bearing concentrated area last century.Yanshan period’ Tongshi igneous complex intrusive and control the distribution of gold deposits.According to the previous experience of deposit exploration,and combining with the similar conditions adjacent areas’ prospecting experience inferred that Tongshi the forming limit depth of gold is under the bottom of Cambrian Changqing Group Zhushadong Group Dingjiazhuang dolomite paragraph.That is between Cambrian sedimentary cover with Precambrian crystalline basement unconformity.Above the unconformity surface is a favorable location for gold mineralization.According to the thickness of true formation and combining with stratigraphic occurrence.Calculating out of the ground to a vertical distance of unconformity is corresponding metallogenic gold prospecting target ore bodies buried depth. Estimating the depth of mineralization to provide a basis for deep drilling engineering design.%鲁西铜石地区位于沂沭断裂带西侧的鲁西隆起区，是20世纪末新发现的金矿聚集区，燕山期侵入的铜石杂岩体控制了金矿床的分布。根据矿床勘查经验并结合成矿地质条件相似的邻区找矿实践，推断铜石地区金矿形成的极限深度为寒武系长青群朱砂洞组丁家庄白云岩段之底，即寒武系沉积盖层与前寒武系结晶基底之间的不整合面，不整合面之上是金矿形成的有利部位。根据地层真厚度，结合地层产状计算出地面至不整合面的铅直距离就是相应找矿靶区的金成矿预测靶区矿体埋藏深度，估算矿体埋藏深度为深部钻探工程设计提供了依据。