June 2012 Volume 2, Issue 2, PP.52-61 Scientific Journal of Earth Science AVS 52 内蒙嘎达坂铅锌多金属矿区综合物探研究 * 徐新学,马为,李世斌,林星,范剑,刘涛,王茜 天津市地球物理勘探中心,天津 300170 摘 要:物探可在矿产勘查的各个阶段发挥作用,并在研究控矿构造,圈定成矿有利地段,进行矿床(体)空间定位方面有着不 可替代的作用。物探方法一般用于间接找矿,其反演问题存在多解性,采用综合物探,充分与地质、化探相结合,扬长避短,是 提高解的唯一性的基本思路。文章结合内蒙嘎达坂矿区研究成果,针对物探方法组合所解决的地质问题进行了分析研究,并探讨 了在靶区优选和成矿位置预测方面的作用。分析研究认为具备低阻、高极化、相对高磁与地表蚀变套合一体是矿区矿(化)体存在 的组合特征,其中断裂及异常带交汇部位的异常组合是重点靶区。同时对于含有磁黄铁矿等浸染状硫化物矿床而言,面积性激电、 高磁工作相结合对矿区域构造格局、断裂构造展布及局部成矿异常带圈定,继而进行浅地表矿体位置定位有直接的指导意义;激 电测深、音频大地电磁法有机组合,辅以精测阶段频谱激电多参数相补充,是实现由浅及深,由已知到未知进行深部地质物探找 矿的基本思路。 关键词:嘎达坂矿区;铅锌多金属;综合物探 Application of Integrated Geophysical Prospecting to the Research of Polymetallic Silver-lead-zinic-copper Mining Areas in Gadaban, Inner Mongolia Xinxue Xu ﹡ , Wei Ma, Shibin Li, Xing Lin, Jian Fan, Tao Liu, Qian Wang Tianjin Geophysical Exploration Center, Tianjin, China, 300170 ﹡ [email protected]Abstract: Geophysical prospecting plays an important role in each stage of minerals resources exploration, especially in punctuating favorable metallogenic area, studying ore-controlling structure and mine specialization deposit. Geophysics prospecting is commonly used in indirect exploration for its multiplicity of solutions in inversion, so it is the basic method of integrated geophysical prospecting to improve the uniqueness of solution. Based on the theory and effect of each method, author analyses what the geological problems the different combinations could solve in different stages of geological exploration, which has instructive effects on forecasting the metallogenic location and optimization of targets. Research results show that the combination of low resistivity, high magnetics, high polarizability and surface alteration is the combined features of ore body existing in research area, and it is the optimization targets of high-grade ore zone in fault assemblage or intersection of anomaly belt. For the impregnated sulfide deposit containing pyrrhotite, the combination of area IP and high magnetic measurement have directly instructive signification to study the tectonic framework and fracture distribution and find the local metallogenic anomaly zones. The combination of IP sounding, AMT, and SIP is the fundamental method of exploration of deep geology. Key words: Gadaban; Lead-zinic-copper Mining; Integrated Geophysical Prospecting 引言 地球物理(物探)方法一般只能测量到目标物的物理场或晕,而不是测量目标物本身,测量结果需经过推断解 释才能与目标物联系起来。任何地球物理场的反演问题都没有唯一性解答,或者,任何一种地球物理观测资料的解 释都不可避免地存在着多解性,即同样的异常可由不同类型的目标物引起,不同埋深、形状和尺寸的目标物可引起 * 基金项目:天津华北地质勘查局 2011 年度科研项目,项目编号:HK2011-06。
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Application of Integrated Geophysical Prospecting to the Research of Polymetallic ……
Geophysical prospecting plays an important role in each stage of minerals resources exploration, especially in punctuating favorable metallogenic area, studying ore-controlling structure and mine specialization deposit. Geophysics prospecting is commonly used in indirect exploration for its multiplicity of solutions in inversion, so it is the basic method of integrated geophysical prospecting to improve the uniqueness of solution. Based on the theory and effect of each method……
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June 2012 Volume 2, Issue 2, PP.52-61 Scientific Journal of Earth Science