Study on geological model for prospecting prediction of Shimensi tungsten deposit in northern Jiangxi Province

Based on the theory and method of prospecting prediction in the exploration area, the tungsten polymetallic mineralization of Shimensi ultra-large tungsten deposit in northern Jiangxi Province is summarized systematically. The ore-forming geological body of the veinlet-disseminated orebody is porphyritic biotite granite formed in Yanshanian period, and the ore-forming geological body of the large quartz vein-type and hydrothermal cryptoexplosive breccia-type orebody is granite porphyry. The metallogenic structures are nearly EW-trending and NW-trending faults. The metallogenic structural plane is the contact interface between porphyritic biotite granite and granodiorite, and it is roughly consistent with the distribution of pegmatite-like shell and controlled the distribution of large-scale disseminated orebodies. The metallogenic structural planes of the edges of granite porphyry and cryptoexplosive breccia controlled the large-scale cryptoexplosive breccia-type ore body. The iconic alterations related to mineralization include greisenization, silicification, potassium feldsphaerization and muscovitization, among which greisenization is most closely related to tungsten mineralization. On the basis of the above understanding, a "trinity" geological model for prospecting and prediction of Shimensi tungsten deposit is established in this paper, which provides theoretical support for guiding the prospecting work in the large area of granodiorite.