衍生指数法在阳山金矿激电测深中的应用  

Application of Derivative Index Method on IP Sounding of Yangshan Gold Mine

作　　者：喻春[1,2] 熊韬[1] 赵维新[1] 

机构地区：[1]武警黄金第十二支队,四川成都611732 [2]成都理工大学地球物理学院,四川成都610059

出　　处：《黄金科学技术》2014年第3期43-47,共5页Gold Science and Technology

摘　　要：阳山金矿为甘肃省南部的一大型类卡林型金矿,大地构造位置处于扬子、印度和华北板块汇聚形成的倒三角形构造域北缘,松潘—甘孜造山带与秦岭造山带结合部位。含金地质体主要为黑色黄铁矿化碳质千枚岩、黄铁矿化碎裂蚀变灰岩及黄铁矿化斜长花岗斑岩,其中黄铁矿呈他形、细—微细粒浸染状分布,与金矿化关系密切,是重要的找矿标志,局部地段花岗斑岩金矿化强烈,经过岩石电性参数测定显示具有低阻高极化的电性特征。衍生指数法激电测深在找水方面应用较多,并且富水地层与金属矿化建造和破碎蚀变带等均具有低阻高极化的电性特征,所以本次工作尝试利用衍生指数法解释阳山金矿的测深资料,推断地下低阻高极化异常体赋存状态并为重型山地工程布设提供依据。通过衍生指数法解释2条测深剖面并成功布设验证钻孔的工程,结果表明,该方法在阳山金矿是一种切实可行的找矿方法。Yangshan gold deposit is a large carlin-type gold deposit in the south of Gansu Province.It is located at the northern margin of an inverted triangle tectonic domain which converged to form by the Yangtze,India and North China Plate,at the binding site of Songpan-Ganzi orogenic belt and Qinling orogenic belt.Gold-bearing geological mass is mainly the black pyritization carbonaceous phyllite,the pyritization cataclastic altered limestone and the pyritization inclined long granite porphyry.Among them,the pyrite shows anhedral and fine to fine grained disseminated distribution and it is closely related to the gold mineralization,and also an important prospecting mark.In the Partial area,granite porphyry has developed a strong gold mineralization and the electrical characteristics of low resistance-high polarization which passes through the rock electrical parameters measured.The derivative index method of IP sounding is usually more in terms of looking for water.As all of them have the low resistance-high polarization’s electrical characteristics which are water-rich strata,metal mineralization construction,broken alteration zone and so on,this work attempts to use derivative index to explain the bathymetric data of Yangshan gold mine and infer the status of the underground low resistance-high polarization anomaly occurrence,all of which provide the basis for laying heavy mountain project.Using the derivatives Index explains two bathymetric profiles and successfully laid verification drilling,and the project examples show that the method is a practical prospecting method in Yangshan gold mine.

关 键 词：地球物理 黄铁矿化 电性特征 卡林型金矿 

分 类 号：P618.51[天文地球—矿床学]