利用活性炭和能谱测量识别深部矿致异常

Use of Activated Carbon and Energy Spectrum Measurement Recognition Deep Deposits to Anomalies

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。

Granite area content distribution of radioactive elements by lithology,structure,rock altered function and uranium mineralization and so on many kinds of factors,Formed complex radioactive anomalies,in order to identify from the deep deposit of ore anomaly information,the active carbon adsorption measuring radon(Rn)accumulated measurement and pit gamma ray spectrum measurement,and the combination of the radon concentration and total energy content such as word processing ratio,eliminate the near surface radioactive anomalies,which reflect the deep uranium mineralization information.Coarse grain of granodiorites work area is located in ALaShan a long dragon mountain arch with broken part,castle peak southwest edge of rock mass fort,lithology for Gary east midterm and fine grain of mengshan rock.The main structure for north west to deep fault,dragon mountain for arch with broken and diversity of corridor boundaries,the main control of the rock mass distribution and fort castle peak form the dragon head with the uranium mineralization,uranium deposits,the structure of diagenetic,metallogenic plays a leading role.There are two major groups in the ore deposit structure,one group of north east to to,a group of north west for to trend,are deep fault fracture and fracture in the subprime rock extrusion serious.Measuring parameters have radon(Rn) concentration and the energy spectrum measurement(Uranium(U),Thorium(Th),K(K)) of the total way content.The theoretical and experimental research that radon concentration measurement is accumulated deep uranium mineralization and near surface the comprehensive reflection of uranium anomaly information,in the structure control of deep uranium upper body sharp peak abnormalities,has the obvious radon anomalies strong focus on heart and gradient change gently,widths and reflect the near surface uranium abnormal mixed and disorderly and discontinuous,radon concentration and the total energy spectrum way content ratio processing,eliminate the near surface uranium anomaly information,clear outstanding deep uranium mineralization favorable information..In an extraordinary number of the fracture structure crossing or interchange,according to abnormal exhibition cloth direction reflects the north west to the ore-controlling fracture,think ore-controlling fracture of radon gas migration is good channel,gradient change reflects the fault as north east tendency.The geological drilling verification in the late to meet the abnormal ore in industrial ore body.According to the measuring radon active carbon adsorption of radon concentration and the total way widths of uranium ore ratio to determine the content of abnormal obvious effect,think that the two kinds of measurement methods of effective combination,can be used as granite area in the future for deep hydrothermal type uranium mineralization effective combination means.