多源信息找矿预测技术研究及其应用——以吉林省砂金沟金矿床为例

Research and Application of Multi-Source Information for Ore Prospecting and Prediction:Taking Jilin Shajingou Gold Deposit as an Example

夹皮沟金成矿带属于滨太平洋成矿带的重要金矿集中区之一。吉林省砂金沟金矿床位于吉林省桦甸市(东/南)部,其大地构造位置处于华北板块北缘东段、吉黑造山带南侧、夹皮沟金成矿带中部,成矿地质条件非常优越。勘查区周边已发现多个大、中、小型金和银矿床,如北西部有二道沟金矿床、庙岭金矿床、云峰铅锌矿床、马家店金矿床,北部有八家子金矿床,区内有大洋岔金矿床等。砂金沟金矿床与以上金矿床地质背景相同,具备产出大、中型金矿床的地质条件。本文地球物理、地球化学和地质综合研究结果显示:区内含矿构造具有低阻高极化的物性特征,低阻发育部位往往指示断裂构造存在,低阻带内呈条带状的中高阻带更具有成矿潜力;土壤地球化学异常表现为Au-Ag-As-Cu-Hg-Sb等综合异常;区内北西和北东矿体分布具等距性、矿体与脉岩空间具相关性、矿体元素具富集性规律,并讨论了成矿具有多因耦合性。最后提出下步找矿方向应为断裂控矿及岩浆侵入构造系统控矿两大类。

The Jiapigou gold metallogenic belt is one of the important gold concentration areas in the marginal-Pacific metallogenic belt.The Shajingou gold deposit is located in the southeast of Huadian City,Jilin Province,which is in the eastern part of the northern margin of the North China plate,the southern side of the JiHei orogenic belt and the central part of the Jiapigou gold metallogenic belt,with superior metallogenic geological conditions.A number of large,medium and small gold and silver deposits have been discovered in the exploration area and surrounding area,such as Erdaogou gold deposit,Miaoling gold deposit,Yunfeng lead-zinc deposit and Majiadian gold deposit in the northwestern area,Bajiazi gold deposit in the north area and Dayangcha gold deposit in the exploration area.With the same geological background as the above gold deposits,the Shajingou gold deposit has the geological conditions of producing large and medium-sized gold deposits.Based on the comprehensive study of geophysics,geochemistry and geology,it is concluded that the ore-bearing structures in study area are characterised by low resistance and high polarization.The development of low resistance areas often indicates the existence of fracture structures,and the medium and high resistance zones within the low resistance zones are striped and have more potential for mineralisation.The soil geochemical anomalies are Au-Ag-As-Cu-Hg-Sb and so on.The distribution of ore bodies in the northwest and northeast of study area is equidistant,the ore bodies are spatially correlated with the vein rocks,and the ore bodies are enriched in elements,and the multi-causal coupling of mineralisation is discussed.The next prospecting should be fault-controlled ore and magmatic intrusion system controlled ore.