AMS（anisotropic magnetic susceptibility） has been developed for more than 60 years and has become a mature technology in the field of geology. Its application in igneous rock research can effectively divide rock mass（lithofacies）boundary

analyze the direction of magmatic flow

explore the location of caldera

extract magmatic uplift emplacement process

regional deformation history and other information. The Xiangshan volcanic basin in Jiangxi Province is the world’s third largest volcanic-type uranium deposit and is associated with deep Pb-Zn-Ag mineralization. The ore-hosting rocks in the mine area are mainly the Early Cretaceous rhyolite dacite and lacustrine lava. The study history is more than 60 years

and accumulated a lot of basic geological data. Although the research is deepening

the problems of the ancient volcano passages in Xiangshan area are still in dispute. The introduction of this technology can clearly define the position of Xiangshan ancient caldera

and solve the related problems.