MODELING OF STRESS FIELD OF FENGHUANGSHAN OREFIELD DURING MINERALIZATION

This paper analyses the characteristics of structural compounding of Fenghuangshan orefield,and brings to light that the deformations during D₄ and D₅ phases are main structures controlling mineralization.The information obtained by analysis of the compounding of structural systems together with the data of regional geology and geophysics indicates that NNE-trending sinistral ductile-shear zones which lie on the east and west sides of the pluton may provide the main dynamic source for structural control of mineralization.From the above,the synmineralization stress field of Fenghuangshan orefield is modeled by means of finite element method.The results indicate that anomalously concentrated stress and strain are located along the contrat zone between the pluton and country rock and the outer ductile-shear zones.Low stresses occur where different systems of structures meet.Such places are favorable for the formation of deposits.