Characteristics Of Gold Geochemical Block And Resources Assessment Of Guangdong Province, China

Geochemical block is defined a giant rock block with high content of one or more elements within the upper earth's crust. It can provide large metal endowments necessary for the formation of large to giant ore deposits or ore camp. Based on the geochemical block concept and developed methodology,nine gold geological blocks are delineated by calculating the data obtained in regional geochemical mapping in Guangdong and getting 2.0 ng/g as the threshold of the blocks . In this thesis the author summarizes the regional geology and gold mineralization characteristics, describes the spatial distribution of Au geochemical blocks in Guangdong and the characteristics of hierarchically nested geochemical patterns, and analyses the spatial relationship of these blocks with known Au deposits.The study indicates that all the large gold deposits in Guangdong are located within Au geochemical blocks. It demonstrates clearly that large gold endowment is the prerequisite to the occurrence of large gold deposits, and the large blocks indicate the high occurring possibility of large gold deposits . The studies of internal structure of the blocks also reveal that different kind of gold deposits has different spatial relationship. The faults control type gold deposits usually locate on high concentration anomalies and the type of spatial relationship is concentric. The sediment hosted microdisseminated type gold deposit locate on low concentration anomalies, the spatial relationship is uncertain.The mineralization coefficients (Mc) is determined in some blocks on which many explorations has be carried out, the number scale from 0.05%~1.07%. By using Mc the potential Au resources in Guangdong is estimated, the total potential assessed resource of Au in Guangdong is about 813 tons and 550.97 tons.