Analysis Of Gravity And Magnetic Anomalies In The Danchi Metallogenic Belt, Guangxi And Applications In The Detection Of The Rare Metals

Guangxi Dachang tin polymetallic ore field is located in the southeast of Nandan County,Hechi City,Guangxi Province.It is adjacent to the southeastern part of the Qinghai-Tibet Plateau in the west,east of the Yangtze Block and the western edge of the South China Block.It is at the intersection of different tectonic units and has a complicated geological background.Special,faults structure development,rich mineral resources,and one of the most important rare metal enrichment areas in the world.At present,the theory and prospecting research of rare mineral resources are vigorously developed at domestic and abroad,and the Dachang mining area is a good research object.This paper relies on the special project of “deep resource exploration and exploitation”,aiming to carry out research on the rare metal prospecting of 5 km.It is of great significance to study the Moho surface of the mining area,the depth of the crystalline basement and the undulating form for subsequent prospecting.It is known that the ore-controlling rock mass in this area is mainly granite.Using the gravity and magnetic data of Dachang mining area combined with geological background for data inversion analysis,combined with the research results of predecessors,the signs of finding hidden granite are summarized: low gravity and high magnetic anomalies.An important symbol for delineating granite.Analysis of the rare metals metallogenic model,ore-controlling rock mass,associated relationship,etc.in this area,the main achievements and understandings are as follows:1.The gravity anomaly in this area is generally in the northwest-south eastward step zone,which is east positive and west negative,corresponding to the undulating state of the Moho surface;the regional magnetic anomaly is manifested on the lowreduced negative magnetic background field.The magnetic anomaly group with negative phase,the position of the magnetic anomaly is mostly like the alteration zone of the granite in contact with the surrounding rock in this area,which is a favorable sign for prospecting;2.The depth inversion of Moho surface is 34-44 km,the southeast margin is buried shallow,and the northwest is deep,which is in good agreement with the previous calculation results.The depth of gravity and magnetic anomaly crystal base is about 5km,which is the depth of the main ore-carrying strata in the area: the Devonian system,the interface is flat and the change is slow.The overall depth of change is not more than 1 km;3.The main rare metals in the area are indium,cadmium,gallium,etc.,which are enriched in the form of isomorphism and associated with tin polymetallic ore;the orecontrolled orebodies in the area are mainly granite,and once the distribution of concealed granite bodies can be defined,we find the rare metals,indirectly.