Gamma-ray Spectrometry And Geogas As Detection Of Concealed Granite Uranium Research

Relying on National High-tech R&D Program (863 Program) "high-precision spectroscopy detector research and development " (project number:2012AA061803), the National Natural Science Foundation of China" Concealed geological body and fault of the geogas research " (project number:41074094) and National Geological Survey of the project "research polymetallic mineralization geological conditions and comprehensive prospecting method of uranium exploration zone in southern Guangdong Zhuguangshan ready" (project number:12120113090500), In northern Guangdong, the Yangtze River uranium exploration zone as the research object to be measured with a gamma-ray spectrometry gas as the main means of geological exploration area characteristics, metallogenic regularity, ore-controlling factors and metallogenic model, discussed jointly application air and ground gamma ray spectrometry measurements detect concealed granite uranium approach technical issues in order to provide an effective study area concealed granite uranium exploration comprehensive geophysical and geochemical techniques.According to three years to complete the exploration area in the northern part of Guangdong five to seven geogas measuring line and gamma spectrometry survey lines acquired measured data 732 measuring points, analysis and research, the following conclusions:1. The study area has occurrence of such steep, very thin features concealed granite uranium, to air measurement needs to pitch measuring point encryption to 10m, in key sectors over the possible ore, etc., if necessary to encrypt the distance measurement points 5m; gamma-ray spectrometry pitch can be set to 10-20m.2. In order to achieve effective detection of weak anomalies geogas U, field sampling, liquid collectors need to be connected in series, increasing the capture efficiency gas.3. Through the mine caused by abnormal area of multivariate statistical analysis, summarized U mine gas anomalies caused to have the following characteristics:1) Correlation analysis showed that U related elements include:rare earth elements, Li, Cr, Mn, Ni, Cu, Sr, Y, Th.2) Factor analysis showed abnormalities in the mine caused the first public explanation of the value of the highest factor, U, Th loads are high, reaching more than 60%.3) Cluster analysis showed that the similarity is better known anomalies of U, Th, rare earth elements and other elements, when clusters are together.4. Gamma abnormal formation and rupture on strike nearly parallel anomalous zone, which has good spatial correlation between U anomalies and ore anomalies.5. According to air caused by abnormal mineral distribution patterns and distribution, combined with gamma spectroscopy Anomaly judgment, AB survey line 20m-50m,130m-160m,590m-680m, S survey line 480m-500m,590m-720m exception region has good prospecting, and on the 19th survey lines 435m-450m, N survey lines 560m-580m,950m-960m anomalies may be caused by abnormal structure.