地气与X荧光测量在鄂东南某铀矿勘查区找矿中的应用

发布时间：2018-04-24 15:34

本文选题：地气测量 + X荧光测量　；参考：《成都理工大学》2016年硕士论文

【摘要】：本文选题源自国家自然科学基金项目“隐伏地质体与断裂的地气场研究”(项目编号:41074094)与湖北省核工业地质局项目“湖北通城县某铀矿勘查区地气测量”。提出为该勘查区进一步找矿提供科学依据的目标,在勘查区开展了地气测量找矿应用研究。根据成矿地质条件好、前期发现有地表放射性异常等资料为依据,在勘查区布设了四个地气测区,总计布设了10条测线。在10条测线上完成了615个测点的地气测量与基本同线共点的615个测点的土壤X荧光测量,总计获得23985个地气测量数据,21525个X荧光测量数据。根据实测数据,总计划分了13个地气异常区段。论文从勘查区已知矿体上方的地气异常入手,研究了矿致地气异常的元素组合特征、稀土元素分布特征、多元统计特征、异常的空间分布特征、以及与之相关的X荧光异常特征。总结出矿致地气异常的特征为:异常与含矿构造有确定的关联关系,产出在含矿断裂倾斜一侧的上方,与隐伏铀矿有基本的垂直投影关系;地气异常区段内轻稀土较重稀土富集,Ce表现为严重亏损;元素U、Rb、Sr、Y、Cs、稀土元素(La-Lu)、Pb出现异常或高值,U/Th(衬度比)值相对较高;并且在矿致地气异常及相邻区段伴生有U、Al、Ce、Ga、Pb、Ti的土壤X荧光异常或偏高值,以及U/Th(衬度比)值与U/K(衬度比)值的高值。此外,矿致地气异常还有特定的多元统计特征。将上述矿致地气异常特征作为地气找矿标志,论文对四个测区的13个地气异常区段进行了评价,最后,指出了勘查区的重点找矿区域及进一步找矿方向。论文研究表明,地气测量可以获得地下数百米深度处的矿化元素信息,解决传统放射性物探法探测深度不够的技术瓶颈问题。在研究区赋存于断裂中的花岗岩的这类隐伏铀矿,由于断裂提供的通道,在断裂上方及其相邻区域的土壤中会存在着与铀相关的成矿元素异常,这给开展土壤X荧光测量提供了地质依据。而捕获的土壤X荧光异常,对协助解释地气异常的性质可以提供帮助,提高地气异常解释的准确性与可靠性。
[Abstract]:This paper derives from the project of the National Natural Science Foundation of China "the study of the buried geological bodies and the ground gas field of faults" (item No.: 41074094) and the project "Geogas survey of a uranium deposit exploration area in Tongcheng County, Hubei Province" by the nuclear industry geology bureau of Hubei Province. The aim of providing scientific basis for further prospecting in this exploration area is put forward. The application research of geo-gas survey prospecting is carried out in the exploration area. On the basis of the good geological conditions of metallogenesis and the discovery of surface radioactivity anomalies in the Prophase, four geo-gas survey areas have been set up in the exploration area, with a total of 10 surveying lines. A total of 23985 geogas and 21525 X-ray fluorescence data were obtained from 615 geogas of 615 sites and 615 of 615 from the same line on 10 lines. According to the measured data, a total of 13 ground gas anomaly sections were divided. Starting with the geo-gas anomalies above the known orebodies in the exploration area, the paper studies the characteristics of the element assemblage, the distribution of rare earth elements, the multivariate statistics and the spatial distribution of the anomalies. And the characteristics of X-fluorescence anomalies associated with it. The characteristics of the ore-induced gas anomalies are summarized as follows: the anomalies have a definite correlation with the ore-bearing structures, which occur above the inclined side of the ore-bearing faults and have a basic vertical projection relationship with the concealed uranium deposits; In the anomalous region of earth gas, the enrichment of LREE is seriously depleted, and the rare earth element La-Lun (Pb) is abnormal or the ratio of U / T (contrast ratio) is relatively high. In addition, in the ore induced gas anomaly and adjacent regions, the soil X fluorescence anomalies or higher values of U / T ratio and U / K contrast ratio are also found in the adjacent regions associated with U _ (Al _ 2O) _ ce _ GaGaA _ (Pb) Ti, and the values of U / T ratio and U / K contrast ratio are also found in this paper. In addition, there are specific multivariate statistical characteristics of ore-induced geo-gas anomalies. Taking the characteristics of the above ore-induced geo-gas anomalies as the indicators of geo-gas prospecting, the paper evaluates 13 geo-gas anomaly sections in four survey areas, and finally points out the key prospecting areas and further prospecting directions in the exploration areas. The results show that the earth gas survey can obtain the mineralized element information at the depth of several hundred meters underground, and solve the technical bottleneck problem of the traditional radioactive geophysical method. Because of the channel provided by the fault, there will be uranium related metallogenic elements anomaly in the soil above the fault and its adjacent areas, because of the concealed uranium deposits of granite in the study area. This provides geological basis for soil X-fluorescence measurement. The captured soil X-ray fluorescence anomaly can help to explain the properties of the geogas anomaly and improve the accuracy and reliability of the interpretation of the geogas anomaly.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P619.14

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