Abstract:

Shihu gold orefield is located in the middle section of Taihangshan structure-magmatic polymetallic metallogenic belt and the core location of Fuping mantle branch structure.Tectonic deformation and magmatic activity determine the distribution characteristics and metallogenic model of the vein.With the comprehensive analysis for the tectonic stress field and metallogenic elements of the deposit,the following understanding can be concluded：①due to the early Neocathaysian movement of NNE direction,the deposit formed two sets of conjugate shearing joint systems of NW direction and nearly SN direction as the effects of torsion stress field,where in the occurrence is stable,the scale is relatively large,and the conjugate shearing joint systems are superimposed on the complex fold formed earlier;②due to the intrusive rock（Mapeng pluton） of deep fault activities,the surrounding rock is further deformed, and the vicinity there of（such as Tuling） formed with an arch tensile stress field,and the ulterior point（such as Shihu and Xishimen） formed with a compression stress field of nearly north-west direction; ③ the metallogenic hydrothermal solution in the magmatic activity period moved from deep to shallow and from SE to NW by taking the contact zone between the pluton and the surrounding rock as the channel;in Shihu and Xishimen areas of the deposit,the joints of NW direction are in a tension environment and are primary ore spaces and rich metallogenic regions,while the north-south is in an extrusion closed state,and the mineralization is poor;Tuling area is in an arch tensile environment,all the fractures of different occurrences are subjected to the effects of hydrothermal mineralization,and the metallogenic scale thereof is limited.

Key words: Structural ore control, Conjugate joint, Structural stress fields, Ore-forming model, Shihu gold orefield