辽东青城子矿集区成矿规律及找矿预测地质模型

Metallogenic regularity and prospecting prediction geological model of Qingchengzi ore concentration area in Eastern Liaoning Province

青城子矿集区位于华北板块北缘,辽东裂谷带中段,矿集区内产有众多大型、中型铅锌矿床、金矿床、银矿床。为深入了解矿集区内铅锌矿床、金矿床、银矿床空间分布的差异性及成矿热液的运移方向,在收集整理前人研究成果的基础上,总结了矿床的时空分布规律。结果表明:铅锌矿床的成矿年龄集中于225~221 Ma,金矿床和银矿床的成矿年龄集中于238~197 Ma;空间上,以印支期双顶沟岩体为中心依次向外产出铅锌矿床、银矿床、金矿床;成矿流体的运移方向以甸南—榛子沟一带为中心,分别向东西两侧及沿断裂迁移。结合矿集区的成矿规律与野外地质调查,初步建立了青城子矿集区找矿预测地质模型。研究可为推动在青城子矿集区内开展进一步找矿工作提供新思路。

Qingchengzi ore concentration area is located in the northern margin of North China Block and the central segment of Liaodong Rift Belt,and contains a great many medium and large ore deposits of lead-zinc,gold,and silver.In order to deeply understand the spatial distribution differences of lead-zinc,gold,and silver ore deposits in the ore concentration area and the migration direction of ore-forming hydrothermal fluids,the authors summarized the temporal and spatial distribution patterns of the deposits,based on the collection and organization of previous research results.The results show that the mineralization age of lead-zinc deposits is concentrated between 225 and 221 Ma,while the mineralization age of gold and silver deposits is concentrated between 238 and 197 Ma.Spatially,lead zinc ore,silver ore,and gold ore are successively produced outward from Shuangdinggou rock mass in Indosinian period as the center.The trace elements research indicates that the migration direction of ore-forming fluids is centered around Diannan-Zhenzigou area,moving towards the east and west sides and along the fault.Based on the study of the mineralization laws in the ore concentration area,and combined with recent field geological surveys,the authors established a preliminary geological model for prospecting prediction in Qingchengzi ore concentration area,wich could provide new ideas for promoting further prospecting work in the area.