高松矿田芦塘坝矿段节理特征分析

Analysis on joint characteristic in Lutangba ore section of Gaosong ore field

根据高松矿田芦塘坝矿段节理系统的实地观测,对岩石节理特征、性质、方位的详细分析,探讨了节理系统发育的特征,发现该矿段三个方位岩石节理优势组:第一组300°～340°∠70°～85°,第二组120°～170°∠50°～65°,第三组250°～280°∠35°～55°,分别占节理总数的55%、23%和18%。对各优势节理组中脉状硫化矿以及氧化矿观察采样,分析测试主要成矿元素Cu、Pb、Sn、Ag、As、Mn,研究了节理与成矿的关系,认为第三组节理与成矿关系最为密切,第二组次之,第一组节理虽发育广泛,但含矿性较差,这可能与NE向断裂主要起导矿作用,而矿液最终充填于控矿构造EW向小断裂中有关。

The field investigation and detailed analysis on ioint 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 to- tal 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 minerali- zation, the joints in the 3rd set are the most significant factors, and the joints in 2nd are the second most im- portant 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.