草原覆盖区铅锌银矿床地电化学异常特征及找矿预测--以内蒙古哈达特陶勒盖矿区为例

Features of Geo-Electrochemical Anomaly and Pb-Zn-Ag Exploration Forecast in Plains——Taking Hardattolgoi Lead-Zinc-Silver Polymetallic Deposit of Inner Mongolia as an Example

为了在草原覆盖区寻找隐伏铅锌银矿床,对内蒙古哈达特陶勒盖矿区开展了地电化学法找矿研究。首先对铅锌银矿石进行电化学溶解能力和在已知矿体上的地电化学法找矿可行性试验,结果表明:Zn-Pb-Ag矿可产生很强的电化学溶解;已知矿体上方同步出现Zn、Pb、Ag异常,异常值大小为Zn>Pb>Ag。在工作区开展了找矿预测研究:圈出Zn异常12个、Pb异常8个、Ag异常17个,依(wB)Pb(7.5～15)×10-6、Zn(7～14)×10-6、Ag(0.008～0.016)×10-6划分出异常外带,依Pb(15～30)×10-6、Zn(14～28)×10-6、Ag(0.016～0.038)×10-6划分出异常中带,依Pb≥30×10-6、Zn≥28×10-6、Ag≥0.038×10-6划分出异常内带;确定综合异常区4个;结合地质背景,划分出A、B、C三类异常靶区各一个,其中A类靶区为找矿最有利地段。

In order to find Pb-Zn-Ag ore deposits in plains, geo-electrochemical exploration is carried out in Hardattolgoi lead-zinc-silver ore deposit. In the feasibility experiments of electrochemical dissolution and geoelectrochemical exploration in the Abag County, Inner Mongolia, Zn, Pb and Ag can produce intensive electrochemical solution, and anomalies synchronously on the ore bodies. The geo-electrochemical anomalies are found to range in the order of Zn 〉 Pb 〉 Ag value. By the geo-electrochemical method, twelve Zn, eight Pb, and seventeen Ag anomalies are found in the working area. The low-abnormal belts consist of （ ws ） Pb 7.5 ×10^-6 - 15 × 10^-6, Zn 7 × 10 -^-6 -14 × 10^-6, Ag 0. 008 × 10^-6 - 0. 016 × 10^-6 while the middle abnormal belts of Pbl5 ×10^-6-30×10^-6, Zn 14×10^-6-28 ×10^-6, Ag0.016×10^-6-0.038 ×10^-6, and the high abnormal belts of Pb≥30 ×10^-6, Zn≥28 × l0^-6, Ag≥0. 038 × 10 ^-6. Four synthesis anomalies are divided in this area. According to geological background, three exploration targets （A, B, C） are divided, and target A is the best one.