摘要
鞍山齐大山铁矿王家堡子采区产出鞍山式沉积变质型铁矿,铁矿石多以磁铁贫矿为主,局部产出富铁矿,目前钻探工程控制标高为-600m,采区深部的资源潜力是急待解决的问题,为此对采区进行音频大地电磁测量和研究工作。齐大山铁矿的电性变化复杂,通过先期的实验剖面确定了矿区铁矿体的3种不同电阻率特征,然后对王家堡子采区的3760线、4050线、4500线进行音频大地电磁测量、数据处理和断面反演分析。推测3760线的低阻由磁铁贫矿引起,局部高阻为假象赤铁贫矿引起;推测4050线和4500线浅部的低阻由磁铁贫矿引起,深部的高阻为假象赤铁贫矿及磁铁贫矿引起。同时预测3760线、4050线和4500线西侧深部均有低电阻率显示,反映出隐伏铁矿床的存在特征,推测在-1 000m标高以下仍存在有隐伏的富矿体或板状磁铁贫矿。经过钻探验证,获得了预期的找矿效果。
In Wangjiabuzi block of Qidashan Fe deposit in Anshan city occurs Anshan style sedimentary metamorphic Fe ore. The ore is generally poor dominated by magnetite but rich ore occur locally and is controlled to elevation -600m by drilling. Audio magnetotelluric sounding survey was conducted to solve the urgent problem of ore potential evaluation to depth in the block. The deposit is complicated in electric property. Based on the pre -existing experimental section are determined 3 types of different resistivity characteristics then the survey conducted along line 3760, 4050 and 4500 of the block and the data pro cessed and inversion analysis of the sections completed. It is deduced that at line 3760 the low resistivity is caused by poor magnetite ore and local high resistivity by pseudomorphic hematite; shallow low resistivity by poor magnetite ore and deep high resistivity by pseudomorphic hematite at line 4050 and 4500. Display of low resistivity at west side of line 4050 and 4500 is the reflection of blind ore body to depth. It is predicted that blind rich ore body and tabulate poor magnetite ore body occur beneath elevation -1000m and the prediction verified by drilling.
作者
刘明军
王洪波
于昌明
LIU Mingjun;WANG Hongbo;WANG Changming(Liaoning metallurgical geology exploration institute Co.Itd,Anshan 114038,Liaoning,China;Geological and Geophysical Institute of Chinese Acadermy of Sciences,Beijing 100029,China)
出处
《地质找矿论丛》
CAS
CSCD
2018年第4期627-633,共7页
Contributions to Geology and Mineral Resources Research
基金
国家自然科学基金项目(编号:41672078)资助
关键词
齐大山铁矿王家堡子采区
音频大地电磁测深
找矿预测
鞍山市
辽宁省
Wangjiabuzi blpck of Qidashan Fe deposit
audio magnetotelluric sounding
prospecting prediction
Wangjiapuziblock
Anshan city
Liaoning province
