河北省承德某斑岩型铅锌矿床外围及深部找矿意义研究

老旧矿山外围及深部找矿已成为当前及今后一段时期地质找矿的重点，如何利用现有理论或结合实际工作成果来实现老旧矿山外围及深部找矿突破，亟待深度研究。对于河北省承德地区某斑岩型铅锌矿床，以往勘查工作集中在斑岩体本身及其与碳酸盐岩的接触带（矽卡岩型矿床），忽略了外围构造裂隙内矿体及深部铜钼矿体的研究。近年来的地质勘查工作表明，该区铅锌银等元素地球化学异常发育，激电异常与控制矿体延伸一致。钻探工作发现，斑岩体外围石英砂岩中分布有热液脉型铅锌银富矿体，深部存在铜钼矿体，岩芯原生晕样品分析显示该矿床矿化具有垂直分带性。通过对区域地质、矿区地质及矿体围岩蚀变、矿化分带等特征的总结研究，并将这些特征与斑岩型矿床典型矿化分带模型进行对比，发现其与斑岩型矿床成矿系列特征一致，找矿潜力巨大，从而明确了该区外围寻找铅锌银矿，岩体内浅部寻找铅锌银矿、深部寻找铜钼矿的找矿方向。在此基础上，结合物化探异常划定了2处找矿靶区，为预测该斑岩型铅锌多金属矿床外围及深部找矿前景和指导今后地质勘查工作提供了重要参考。

Study on the Prospecting Significance for Peripheral and Deep Parts of a Porphyry Lead-zinc Deposit in Chengde City of Hebei Province

Prospecting for the peripheral and deep parts of old mines has been the focus for geological exploration at present and future.How to use the existing theories or combined with the actual results to achieve a breakthrough in the exploration for the peripheral and deep parts of old mines，which needs further study urgently.For a porphyry lead-zinc deposit in the Chengde City of Hebei Province，previous works focused on the porphyry body and its contact zone with carbonate rocks (skarn-type deposits)，ignoring study on ore bodies in structural fractures of outer zone or deep copper molybdenum ore bodies.Recently geological surveys indicate that the geochemical anomalies are developed in this area for lead，zinc，silver as well as other elements，and the polarization anomalies are consistent with the extension of controlled orebodies.Drilling results show that hydrothermal vein-type lead-zinc-silver rich ore bodies are distributed in quartz sandstones around the porphyry body， and copper-molybdenum ore bodies are present in the deep parts.Analysis results of core halo samples indicate that the deposit is characterized by vertical mineralization.In this paper，it is pointed that these characteristics are same as porphyry deposit series and show great prospecting potential through study on regional geology，mining area geology，alteration of surrounding rocks， and mineralization zoning as well as compared with typical mineralization zoning models of porphyry deposits.Thus，the prospecting directions are defined in this area that looking for lead-zinc-silver deposits in the periphery of the area，lead-zinc-silver deposits in the shallow parts of the rock body，and copper-molybdenum deposits in the deep parts.On this basis，two prospecting target areas were delineated in combination with geophysical and geochemical anomalies，which provided an important reference for predicting the prospects in peripheral and deep parts of porphyry-type lead-zinc polymetallic deposit as well as guiding future geological exploration work.