Analysis on geological conditions and tectonic settings of uranium metallization in the central south Longyuanba pluton, southern Jiangxi Province

Lying in the northern of Nanling late-mesozonic granite belt, Longyuanba composite granite body belongs to Variscan-Yanshanian period in age. Also, lying in the southern of Taoshan-Zhuguang uranium metallogenic belt. The body is composed of 6 granite plutons, namely Gaotukeng, Longyuanba, Jiachakeng, Fangdingdong, Diaomazhai and Dafengnao, which are cale-alkaii granites with rich silica, poor femic, oversaturated alumina and rich uranium. The study area had found three uranium deposits: Liangsanzhai, Egongtang and Shangjiao, and a large number of uranium occurrences, anomaly points and anomaly belts. Based on an analysis of uranium ore-forming geological conditions in the study area such as regional geological background, pluton condition, tectonic framework, regional alteration and uranium characteristics, the authors hold that rich uranium backgrounds, plentiful thermal sources, well-developed structures, intense alterations and moderate erosions constitute the main favorable prospecting conditions in the body. These results are guiding significance in search for deep-seated uranium deposits in the ore district and similar areas. (authors)