Abstract:

Taoxikeng tungsten deposit of Jiulongnao orefield in Nanling area is a typical quartzveintype wolframite deposit, and was formed both by the limits of faults and the granites in the south area of Jiangxi Province. In order to do structural analysis of the deposit, eight middletunnels mapping and nearground or hole drillings were completed, by which the geometry and structural and constructional characteristics of orebearing quartz veins, vein group, ore body and ore bearing granites were measured in detail, as well as collected statistical data of occurrences of ore veins and orerelated faults. The quartz vein orebodies existed in long straight plates with pinch out ends, and arranged in sinistral diagonal pattern, and the vein groups in different trend were crossed each other in diamond stockwork shapes. The ore bearing granite is a steplike rectangular block emplaced by stoping and dyke spreading intruded from NE to NW. The deposit and orebearing granite is of multiperiod in metallogeny and was formed by faults in a predominant factor. Thus the paper established a comprehensively structural and magmatic metallogenic model. That is, the conjugate fault grid system was induced by regional geological stress firstly; the granite upwelled and emplaced in diamonds cut by the faults and filled with greisen and orebearing quartz veins secondly; thirdly, reaction of regional tectonic events triggered breaks in wall rock and granite that induced another magma intrusion with ore and greisen veins, such as inner and outer belts of orebearing quartz veins. Although there were some slight displacements in the veins, the whole distribution was unchanged.

Key words: structural analysis of metallogeny, tectono magma event and metallogeny, Taoxikeng wolframite, Jiulongnao orefield in Nanling area