摘要
河南省夜长坪钼矿床位于东秦岭钼成矿带中,赋存于官道口群龙家园组(Pt_2l)地层中,受燕山期中酸性浅成-超浅成花岗斑岩体控制,产于花岗斑岩和矽卡岩接触带中.矿层中部上凸,向四周及深部倾斜.该矿床深部工程控制程度低,为避免下一步探矿投资的盲目性、缩短工期、实现深部找矿预测的突破,本文阐述了综合利用频谱激电法(SIP)和音频大地电磁法(AMT)两种物探方法有针对性地预测、筛选出深部有利成矿区.通过SIP法,推断整个工作区域内含有较密集的浸染状金属硫化物的矽卡岩和花岗斑岩体.通过AMT法,视电阻率异常与第四系盖层、矿体和浅成-超浅成侵入花岗斑岩体有较好的对应关系.通过钻孔验证,SIP法、AMT法和钻探资料吻合程度较好,说明SIP法和AMT法在该区深部找矿预测是有效的,同时表明该区深部仍有较好的地质找矿前景,这种综合物探方法为该区的深部找矿预测、地质勘探以及资源整合开发提供了有力依据.
Yechangping Mo deposit is a concealed porphyryskarn deposit of the East QinLing Mo metallogenic belt.It was born in the Longjiayuan Fm.dolomite of Guandaokou.Group.The deposit is controlled by the small hided hypabyssalsuperhypabyssal intermediate-aci d granite porphyry body,and located in the contacting zone of granite-porphyry and adjoining rock.The orebodies are lenticular,and swell in the middle,stretche deeply on all sides.The depth of YeChangping Mo deposit is less controlled by the drills.To avoid blindness in the next phase of investment in exploration,shorten the building time,make a new breakthrough of prediction in deep,in this paper,we utilize integrated geophysical prospecting methods of Spectrum Induced Polarization（SIP） and Audio Magnetotelluric（AMT）.Through the method of SIP,it infers that thereare skarn and granite-porphyry rocks containing densely disseminated metal sulphide in the whole work area.Besides,AMT method preferably matches the apparent resistance ratio anomalies to quaternary Quat,ore body and hypabyssalsuperhypabyssal granite-porphyry.It makes it possible for us to predicti and select ore zones in the deepth directly.The solution has been verified by some boreholes.Recent studies show that the integrated geophysical method is a useful tool for predicting deep ore body in Yechangping Mo deposit.In conclusion,this compositive geophysical prospecting method also provides a theoretical basis for predicting deep ore prospecting,geological exploration,resources integration and exploration in Yechangping molybdenum deposit.
出处
《地球物理学进展》
CSCD
北大核心
2015年第1期325-331,共7页
Progress in Geophysics
基金
国家自然科学基金项目资助(4117-4016)
中国博士后基金(2012M521498)
中央高校基本科研业务费专项资金联合资助
关键词
音频大地电磁法
频谱激电法
深部矿体
夜长坪钼矿
Audio Magnetotelluric（AMT）
Spectrum Induced Polarization（SIP）
deep ore body
Yechangping molybdenum mines
