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    综合物化探方法在明光市柳树庄地区金铜多金属矿勘查中的应用研究

    Study on the application of synthetic geophysical-geochemical methods to gold-copper-polymetallic exploration in Liushuzhuang, Mingguang City

    • 摘要: 明光市柳树庄地区位于华北、扬子两大构造单元的交接部位,郯庐断裂带的中段东侧。区内及周边的金铜矿化点较多,有良好的成矿背景和地质条件。为在研究区寻找金铜多金属矿,该文开展了深层土壤地球化学、激电中梯、磁法及可控源音频大地电磁法(CSAMT)测量工作。根据物探高低阻接触带、化探带状异常,推测出3条NW向断层(编号为F1、F2、F3),圈定3处找矿靶区(编号为Ⅰ、Ⅱ、Ⅲ)。靶区Ⅰ为中高阻高极化和正磁异常特征,经钻孔ZK301验证,物探异常主要为黄铁矿化、黄铜矿化引起,未见金矿(化)体。靶区Ⅱ、Ⅲ金元素异常特征明显且异常成带状沿区内主要控矿构造线展布,存在金(铜)矿点,可能为今后的工作重心。综合地质和物化探成果认为,研究区下一步找矿应以寻找可能的成矿构造为突破口。

       

      Abstract: The Liushuzhuang area of Mingguang City is located in the junction of North China tectonic plate and Yangtze tectonic plate, which is in the east side of the middle section of the Tanlu (Tancheng-Lujiang) fault zone. There are many gold-copper-polymetallic mineral occurrences within and around the area, with favorable metallogenic background and geological conditions. Deep soil geochemistry, IP ladder, magnetic method and Controlled Source Audio Magnetotelluric (CSAMT) method were carried out to search for gold-copper-polymetallic ore in the area. According to high and low resistance contact geophysical anomaly and zonal geochemical anomaly, three NW faults (numbered F1, F2, F3) were speculated and three prospecting targets (numbered target I, II, III) were delineated. Target I is characterized with high resistance, high polarization and positive magnetic anomaly, according to the verification of one borehole(ZK301) plugged in the target I area, the geophysical anomaly was turned to be caused by pyritization and chalcopyritization, and no gold mineralized body was found. The anomaly features of gold elements are obvious and distribute in strip-shaped along the main ore-controlling structural lines in the target I and II, indicating a potential prospecting direction with the occurrences of gold (copper). Based on the results of geological and geophysical-geochemical exploration, it is suggested that the next step of prospecting in the study area should focus on the search of possible metallogenic structures.

       

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