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花岗岩地区放射性元素含量分布受岩性、构造、岩石蚀变作用和铀矿化等多种因素影响,形成了复杂的放射性异常,为了识别深部矿床产生的矿致异常信息,采用了活性炭吸附测氡(Rn)累积测量和坑内伽马能谱测量相结合,经氡浓度和能谱总道含量比值等处理,消除了近地表放射性的异常,反映了深部铀矿化信息。工作区位于阿拉善台隆龙首山拱断带东段,青山堡岩体的西南缘,岩性为加里东期中粗粒花岗闪长岩和细粒闪长岩组成。区内主要构造为北西向深大断裂,为龙首山拱断带和走廊过渡带的分界线,主要控制青山堡岩体的分布和龙首山南带的铀矿化、铀矿床,该构造对成岩、成矿都起着主导作用。矿床内主要有两组构造,一组为北东向走向、一组为北西向走向,均为深大断裂的次级断裂并且断裂内岩石挤压破碎严重。测量得到的参数有氡(Rn)浓度和能谱测量(铀(U)、钍(Th)、钾(K))的总道含量。理论和试验研究得知氡累积浓度测量是深部铀矿化和近地表铀异常信息的综合反映,在构造控制的深部铀矿体上部有尖锐的峰值异常,具有明显的氡异常浓集中心且梯度变化平缓,而能谱测量反映近地表的铀异常杂乱而且不连续,经氡浓度和能谱总道含量比值处理,消除了近地表铀异常信息,清晰的突出了深部铀矿化的有利信息。异常多位于断裂构造交叉或交汇处,根据异常展布方向反映出北西向控矿断裂,认为控矿断裂是氡气迁移的有利通道,梯度变化反映出断层为北东倾向。经后期地质钻孔验证在矿致异常处见到了工业矿体。根据活性炭吸附测氡的氡浓度和能谱测量的总道含量比值确定铀矿矿致异常的明显效果,认为这两种测量方法的有效组合,可作为今后花岗岩地区寻找深部热液型铀矿化的有效组合手段。
The distribution of radioactive elements in granite is affected by many factors, such as lithology, tectonic alteration, rock alteration and uranium mineralization, forming a complex radioactive anomaly. In order to identify the ore-induced abnormal information in the deep ore deposits, the adsorption of radon by activated carbon (Rn) cumulative measurement and in-pit gamma-ray spectrometry, the combination of radon concentration and the total energy spectrum of the total energy spectrum eliminates the near-surface radioactivity anomalies and reflects deep uranium mineralization information. The working area is located in the eastern section of the Longshan Shoushan arch belt of the Alashan Altay and is located on the southwestern margin of the Qingshanbao pluton. The lithology is composed of coarse-grained granodiorite and fine-grained diorite in the Caledonian period. The main structure in the area is the NW-trending deep fault, which is the dividing line between the Longshenshan arch-belt and the corridor transitional zone, mainly controlling the distribution of the Qingshanbao pluton and the uranium mineralization and uranium deposits in the south of the Longshangshan belt. Diagenesis, mineralization all play a leading role. There are two main types of structures in the deposit, one is north-east direction, the other is north-west direction, which are both secondary faults of deep faults and crushed rocks are severely crushed within the faults. Measured parameters include radon (Rn) concentration and total trace content of energy spectrum measurements (uranium (U), thorium (Th), potassium (K)). Theoretical and experimental studies show that the cumulative concentration of radon is a comprehensive reflection of uranium mineralization and near-surface uranium anomalies in deep uranium ore bodies. There are sharp peak anomalies in the upper part of structurally controlled uranium ore bodies with obvious concentration centers of radon anomalies and gradient The changes of the energy spectrum are gentle. However, the energy spectrum measurement shows that the near-surface uranium is disorderly and discontinuous. The radon concentration and total energy ratio of the spectrum are treated, which eliminates the near-surface uranium anomalies and clearly highlights the favorable information of deep uranium mineralization. The anomalies are mostly located at the intersections or intersections of fault structures. According to the anomaly distribution direction, it reflects northwest ore-controlling faults. It is considered that ore-controlling faults are favorable channels for radon gas migration. Gradient changes reflect that the faults are northeastward. After the late geological drilling verification in the mine induced abnormalities to see the industrial ore body. According to the apparent radon concentration of radon measured by activated carbon adsorption and the total ratio of energy spectrum measured to determine the apparent effect of uranium ore induced abnormalities that the effective combination of these two measurement methods can be used as the future granite area looking for deep hydrothermal uranium mineralization Effective combination of means.