Hydrothermal Alteration and Element Migration:Taking the Gaomang Area in the North Motianling as an Example
In recent years,multiple uranium mineralizations have been discovered in the Gaomang area on the northern margin of Motianling,Guangxi,the distribution of which has a certain connection with the types and intensities of surrounding rock alterations.The major and trace elements of fresh granite,altered rocks and mineralized rocks in this area were analyzed by using the mass balance calculation method to explore the geochemical characteristics and migration laws of elements in each alteration zone.The results show that the metallogenic materials of the Gaomang uranium deposit mainly originate from the Motianling granite body of the hosting rock.Silicification runs through the entire hydrothermal alteration process,and the mineralization type is siliceous vein-pitchblende type.The large amount of Eu immigration in the mineralization center zone indicates that the nature of the ore-forming fluid is relatively oxidized,providing favorable conditions for the extraction and enrichment of U.The alterations of chloritization,hematitization and pyritization promote the accumulation of metallogenic elements.The migration laws of trace elements such as Li,Be,Cu,Mo and Cs are similar to that of U,suggesting that they are closely related to U mineralization and can be used as indicator signs for the search of uranium mineralization in the Gaomang area.This study provides a certain basis for the future uranium prospecting and exploration in the Motianling area.
万方数据
维普
