十五里桥金矿区物化探异常特征及应用  

The effect of applying geophysical and geochemical anomalies to the Shiwuliqiao gold deposit in Heilongjiang Province

作　　者：张富程[1] 杨言辰[1] 李向文[2] 江秉忠[2] 

机构地区：[1]吉林大学地球科学学院,吉林长春130061 [2]武警黄金第三支队,黑龙江哈尔滨150086

出　　处：《物探与化探》2015年第2期262-267,共6页Geophysical and Geochemical Exploration

基　　金：武警黄金指挥部黄金工作专项(2011-1301);中国地质调查局地质大调查项目(1212011120342)

摘　　要：十五里桥金矿床位于上黑龙江盆地南缘,是近年来通过物化探综合方法查证小比例尺化探异常新发现的又一金矿床。通过土壤测量成矿元素统计分析,Au含量高,变异系数大,局部富集特征明显,为主要成矿元素,其所形成的异常是金矿找矿的直接标志,As、Sb、Cu、Bi异常可作为间接找矿标志;通过电磁场及其异常特征分析,区内存在北北东向隐伏断裂带多组,以高磁、低阻、中低极化为标志,推断为脉岩沿断裂充填引起的;而北东—北东东向控矿构造显示为高阻高极化,且与北北东向断裂构造交汇部位金矿化显示较好。十五里桥金矿床的发现进一步证明了物化探综合方法是大兴安岭北部森林沼泽景观区金及多金属找矿的有效方法。Located on the southern margin of upper Heilongjiang foreland basin,the Shiwuliqiao gold deposit was discovered in recent years though checking the small-scale geochemical anomaly by integrated geophysical and geochemical methods. The soil geochemical survey suggests that Au,which is characterized by high content,higher coefficient of variations and obvious local concentration,is the main ore- forming element. Besides,Au element anomaly is a direct indicator for prospecting,whereas element anomalies of As,Sb,Cu,Bi can be used as indirect indicators in prospecting. An analysis of the electromagnetic field and anomalies show that many sets of NNE- striking concealed faults are characterized by high magnetism,low resistivity,and medium-low polarization,caused probably by filling of dikes. The NE—NEE ore-controlling structures exhibit high resistivity and high polarization,and their intersections with NNE trending faults display better gold mineralization. The discovery of the Shiwuliqiao gold deposit suggests that geophysical and geochemical methods are effective means in search for gold and polymetallic deposits in northern areas of marsh landscape in the Da Hinggan Mountains.

关 键 词：化探异常 十五里桥金矿区 高精度磁测、激电中梯 找矿标志 森林沼泽景观区 多金属矿 

分 类 号：P631[天文地球—地质矿产勘探]