安基山铜矿含矿裂隙分布特征及其与成矿的关系

本文用定点等积测量法研究安基山铜矿地表含矿裂隙,结果表明:成矿期含矿裂隙集中分布在矿化斑岩中,其含脉率等值线与铜矿化强度率等值线基本吻合。各成矿阶段含矿裂隙及矿体展布方向均以北北西为主,平行于区域最大挤压应力方向。由此推断,斑岩体地表含脉率值可判断深部铜矿化强度,含脉率等值线形态可预测矿体主要延伸方向。

DISTRIBUTION PATTERN OF ORE BEARING FISSURES AND ITS RELATION TO MINERALLZATION IN ANJISHAN COPPER DEPOSIT,JIANGSU PROVINCE

Two kinds of measured parameter, fissure density and fissure abundance, have been studied by the authors to describe features of the fissure system of different stages in Anjishan copper deposit of Jiangsu prevince. Quantitative data are obtained by direct measurement of fissure at 156 observation points in an area of 1.2km² at the surface of mining area. The data of fissure density and fissure abundance are computed and fit precisely to a trend surface. Poles of these fissures are plotted on equalarea nets and the fissure strikes are illustrated by rosette diagrams. The investigation results show: 1. The ore-bearing fissures of mineralization episodes distribute centrally in mineralized prophyry. The configuration of Cu-ore intensity contour is approximately consistent with that of total fissure abundance contour and the fissure abuneance contour of the chief mineralization stage. 2. The predominant trend of ore-bearing fissures of each mineralization stage in the mining area is NNW. It is parallel to the greatest regional compressive stress. 4. The orientation of orebodies is controled by regional tectonic stress field and coincides with the orientation of the greatest regional compressive stress. In brief, the results of study indicate that the values of fissure abundance on the surface of porphyry could be applied to judge the variance of mineralization in the mining area and the configuration of fissure abundance contour could be applied to forecast the main elongate direction of the orebodies.