深穿透地球化学多方法组合在中条山厚层黄土覆盖区找矿试验研究

Study on Prospecting Test of Deep-Penetrating Geochemical Multi-Mathod in Thick Loess Coverage Area of the Zhongtiao Mountain

在运城盆地厚层黄土覆盖区所开展的深穿透地球化学找矿试验，采用黏土吸附态金属离子（Cu、Co、Nj、Zn等）、热释碳酸盐（△C）、电导率【类似n％】、F离子选择性电极四种方法同时进行。试验对象是深埋在黄土下200—300m以深两个铜镍多金属硫化物矿床。通过本次试验，所选四种方法均不同程度捕捉到巨厚黄土覆盖200m以深的金属矿床成矿地球化学信息，初步证明所选方法是有效的、可行的。其中粘土吸附态金属离子Co、N1、Cu、Zn异常强度与在矿体中的浓集强度呈明显的正相关关系，间接找矿信息热释碳酸盐（△C）、电导率【类似n％】也有一致的趋势。进一步将四种方法的异常信息进行叠加，所形成的组合异常更好地克服了单信息微弱、不稳定的缺陷，可更有效地指示深埋隐伏多金属矿体，明显增大异常对矿体的反映率。本次所选的四种方法，野外采样方法简单，操作简便，与常规土壤化探工作方法基本一致，生产与测试成本能为基层单位接受；对同类土壤覆盖区开展深穿透地球化学方法找矿有推广价值。

We carry out the deep-penetrating geochemical prospecting test for thick loess coverage area in the Yuncheng basin. This work adopts four methods simultaneously, including clay absorption phase metal ions （Cu Co Ni Zn etc.）, thermal released carbonates （AC）, conductivity 【类似n%】 and fluoride ion selective electrode. The test objects are two copper-nickel-polymetallic sulfide deposits buried in 200-300 meters deep under the loess. In the experiment, the four methods all captured the geochemical information from 200-meter-deep metal deposits covered by the thick loess in different degrees. It proves that the methods are effective and feasible preliminarily. There is obvious positive correlation between the anomaly intensity of the clay absorption phase metal ions （Cu Co Ni Zn） and the concentrating strength in the mineral ore. The indirect prospecting information including thermal released carbonates （AC） and conductivity 【类似n%】 shows the same tendency. Furthermore, we superimpose the anomaly information of the four methods and form the assemblage anomaly, which overcome the defect of single information weak and unstable, indicate the buried polymetallic ore effectively, and reflect the mineral ore anomaly more obviously. The cost of production and test of the four methods can be accepted by grass-roots unit, because the field sampling techniques are simple and easy in operation, consistent with conventional soil geochemi- cal exploration methods. The development of the deep-penetrating geochemical prospecting method has the popularization value in similar soil coverage area.