摘要
The field investigation and detailed analysis on joint system in Lutangba ore section of Gaosong ore field reveal the dominant orientation sets of rock joints in this ore section: 1) 300° ~ 340°∠70°~ 85°;2) 120°~ 170°∠50°~ 65°;and 3) 250°~ 280°∠35°~55°.Each set accounts for 55%,23% and 18% of the total joints respectively.A sampling analysis on the main ore-forming elements Cu,Pb,Sn,Ag,As,Mn in veined sulphide ores and oxidized ores of each dominant joint set was carried out.The relationship between developmental characteristics and mineralization of joints and wall rocks was discussed.In terms of mineralization,the joints in the 3rd set are the most significant factors,and the joints in 2nd are the second most important ones.The joints in the 1st set are widely developed with a relatively low ore-bearing potentiality.This may results from that the NE trending fault plays a significant role in ore-transmitting,while the ore fluid eventually fills the small EW trending fractures in the ore-controlling structure.
