高寒冻土区地电提取法找矿预测研究

发布时间：2018-04-21 10:29

本文选题：高寒冻土区 + 地电提取　；参考：《中国地质大学(北京)》2016年博士论文

【摘要】：青藏高原是近年来地质找矿突破的热点之一,以高寒冻土区为主要景观,但是特殊的景观条件使得常规勘查方法遇到了巨大困难与挑战。地电提取法作为勘查新方法之一,在多个景观条件下都取得了良好效果,但高寒冻土区的适用性还有待研究。本文以青海祁连县尕大阪铜多金属矿区为例,开展了地电提取法的技术条件对比和可行性研究,讨论高寒冻土区不同技术参数的合理性,并分析不同元素的异常特征,确定最佳技术参数。在此基础上,在相同景观条件下的其他两个矿床(多才玛、扎家同哪)也进行了可行性验证和找矿预测。利用现代统计学方法对地电提取数据的统计分布特征进行观察,合理地圈定异常,科学地划分异常类型。主要取得以下认识:1、对供电电压、提取液用量、提取液浓度、供电时间、提取电极间距等5种技术条件的不同参数进行对比,发现在高寒冻土区地电提取法的最佳工作参数是9-12V电压、1000mL且15%浓度的硝酸、24-48h时间、1m间距。2、在尕大阪矿区地电提取11种元素中,找矿效果最好的是Ti、Ni,其次为Cu、Zn、Bi,稍差的是Pb,其他元素基本无异常。3、在三个矿区的可行性试验中,均出现了包含主成矿元素在内的多元素组合异常。尕大阪铜多金属矿区以Ti、Ni、Cu、Zn、Bi等元素异常为主;多才玛铅锌矿区以Cd、Pb、Zn、Au等元素异常为主,Cu、Ag次之;扎家同哪金矿区Au、Ag、As、Sb异常均较明显。4、各预测区的元素组合特征与已知剖面大致相同,并且都出现了明显的异常浓集中心和浓度分带现象。尕大阪预测区出现了2个异常浓集中心,控矿断裂F39从两者附近通过。多才玛预测区在中部出现了一个较大规模的异常浓集中心,其范围包含了3条已知矿体所在位置以及其东延部位,有3条近EW向的控矿断层通过。扎家同哪金矿预测区其他元素与Au的异常重合性不好,没有明显的浓集中心。5、在高寒冻土区的两个多金属硫化物矿床中,以主成矿元素的地电提取异常较为明显。尕大阪铜多金属矿中Cu、Zn的异常明显,Pb不明显。而在多才玛铅锌矿中Pb、Zn异常明显,Cu不明显。Pb异常与土壤含量更密切。6、高寒冻土区金矿的地电提取异常以Au为主,其他元素与Au的重合性不好。7、提出因子分析与元素含量等值线相结合的方法,利用因子得分宏观控制单元素异常的圈定和多元素异常的组合,取得了良好效果。一定程度上排除了无效(零散)异常。
[Abstract]:The Qinghai-Xizang Plateau is one of the hotspots of geological prospecting breakthrough in recent years, taking the alpine frozen soil region as the main landscape, but the special landscape conditions make the conventional exploration methods meet with great difficulties and challenges. As one of the new exploration methods, geoelectric extraction method has achieved good results in many landscape conditions, but the applicability of alpine permafrost region needs to be studied. Taking GaOsaka copper-polymetallic mining area in Qilian County, Qinghai Province as an example, the technical conditions and feasibility of geoelectric extraction method are compared and studied. The rationality of different technical parameters and the anomalous characteristics of different elements are discussed. Determine the best technical parameters. On this basis, the feasibility verification and prospecting prediction of the other two deposits under the same landscape conditions are also carried out. By using modern statistical method, the statistical distribution characteristics of geoelectric data are observed, the anomalies are reasonably delineated, and the abnormal types are scientifically classified. The main conclusions are as follows: 1. The different parameters of five technical conditions, such as the power supply voltage, the amount of the extract solution, the concentration of the extract solution, the power supply time, the distance between the extracted electrodes, etc., are compared. It is found that the optimum working parameters of the method for geoelectric extraction in the frozen and alpine regions are as follows: (1) the distance of 1m m ~ (-1) m ~ (-1) 路2 ~ (2) in a range of 10 ~ 12 V voltage of 1000ml and 15% concentration of nitric acid in 24-48 h, and 11 elements are extracted from the geoelectric extraction in GaOsaka mining area. The best prospecting effect is Tiji-Ni, the next is Cuznzn Bi. the other elements have no anomaly. 3. In the feasibility tests of the three mining areas, there are multi-element assemblage anomalies including the main ore-forming elements. In the GaOsaka copper polymetallic ore area, the elements such as Tigniao, Cu, Zn, O, Bi and so on are mainly anomalous; in the Docima lead and zinc mine, the major anomalies of the elements, such as CD Pb, Zn, O, au, au, Ag, and so on, and the au Ag Ag are obvious in the Zhajiatong gold ore area, and the element assemblage characteristics of each predicted area are approximately the same as those of the known profiles, and the results show that the elements in the predicted area are similar to those in the known sections. And there are obvious abnormal concentration centers and concentration zonation phenomenon. There are two abnormal concentration centers in GaOsaka prediction area, and the ore-controlling fault F39 passes from them. There is a large concentration center in the middle of Docima prediction area, which includes three known orebodies and their eastward extension, and three ore-controlling faults in EW direction. The anomalous coincidence of other elements with au in Zhajiatongna gold ore prediction area is not good, and there is no obvious concentration center. In the two polymetallic sulphide deposits in the alpine permafrost region, the geo-electric extraction of the main ore-forming elements is obvious. The anomaly of Cu Zn in GaOsaka copper polymetallic deposit is not obvious. In Docima lead-zinc ore, the Pb anomaly is not obvious. The Pb anomaly is more closely related to the soil content, and au is the main anomaly in the geoelectric extraction of gold deposits in the high frozen soil area. The coincidence of other elements with au is not good. 7. The method of combining factor analysis with element content isoline is put forward. Good results are obtained by using factor score macroscopically controlling the delineation of element anomaly and the combination of multi-element anomaly. Invalid (piecemeal) anomalies are ruled out to some extent.
【学位授予单位】：中国地质大学(北京)
【学位级别】：博士
【学位授予年份】：2016
【分类号】：P631.3

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