黑龙江省东安金矿地球物理勘查应用效果  

Application of Geophysical Methods to Exploration at the Dong’an Gold Deposit,Heilongjiang Province

作　　者：刘伟[1,2] 余友 张秀鸿[2] 

机构地区：[1]中南大学信息物理工程学院,长沙410083 [2]黑龙江省有色金属地质勘查703队,哈尔滨150300 [3].黑龙江省有色金属地质勘查703队,哈尔滨150300

出　　处：《地质与勘探》2010年第4期657-663,共7页Geology and Exploration

摘　　要：东安金矿为一大型低硫浅成低温热液型金矿床,矿体产于印支晚期碱长花岗岩和早白垩世中酸性火山～侵入杂岩接触部位的强硅化蚀变岩中。在矿床普查和详查过程中,利用高精度磁法确定蚀变矿化带,利用电阻率中梯追索圈定含金强硅化蚀变带,利用对称四极和偶极装置电剖面及高密度电阻率法判断矿体倾向及埋深。获得的物探异常规模大、强度高、结构清晰,高阻异常带、正负磁场过渡带或磁力低区与矿体、矿化体空间位置对应关系良好。根据物探异常布置槽探及钻探工程见矿效果良好,地球物理勘查有效地指导了山地工程施工。The Dang＇ an gold deposit is a large-scale low sulphidation epitheral Au deposit in Heilongjiang Province. It occurs in the intermediate-acidity volcanic-invasion rock and the silicon alternation zone of the late Indo-China epoch alkali-feldspar granite. In the process of general survey and detailed investigation, the mineralized alteration zone is delineated by high-precision magnetic survey, the strong silicified gold-beating alteration zone is identified with the resistivity method using central-gradient array, the tendency and depth of ore bodies are judged by the resistivity method based on Schumberger array and dipole-dipole array as well as the high density resistivity method. Large-scale and high-amplitude geophysical anomalies reveal a clear structure. There are good corresponding relations between the low magnetic field or positive and negative magnetic field gradient zones or the high resistivity anomaly zones and ore bodies or mineralization bodies in spatial positions. The result demonstrates that the geophysical prospecting is very effective to guide the trenching and drilling work, and a large number of ore bodies are found according to the geophysical anomalies.

关 键 词：低硫浅成低温热液型金矿 硅化蚀变岩 高精度磁法 电阻率法 东安 

分 类 号：P618.51[天文地球—矿床学]