富宁龙楼铜镍矿区高精度磁异常推断解释研究

【作者】 简燕；

【导师】 李文尧；

【作者基本信息】 昆明理工大学 ， 地球探测与信息技术， 2011， 硕士

【摘要】 铜和镍是十分重要的有色金属。云南省富宁县有丰富的铜镍矿,经过前人的工作探获铜镍矿床、矿点及矿化点共15个,说明富宁地区具有较好的铜镍矿找矿前景。我校受云南博信矿业委托在富宁龙楼地区开展高精度磁测,寻找铜镍矿。富宁地区铜镍矿矿石矿物主要为磁黄铁矿、镍黄铁矿和黄铜矿,与围岩具有较大的磁性差异,具备开展高精度磁测的条件。此次高精度磁测完成线距50米,点距20米的测线80条,剖面总计102.2公里,控制面积为5.2平方公里,采集磁测数据共6080个,采集磁、电参数岩(矿)标本30件。在系统搜集矿区地质、物化探资料的基础上,归纳总结了龙楼地区的区域地质和测区地质特征。本文介绍了高精度磁测野外数据采集方法、质量,总结了岩(矿)石标本磁、电参数特征和已知铜镍矿的异常特征。本文圈定了16个高精度磁测异常,对所获得的ΔT磁异常进行3D频率域转换处理、向上延拓分析、多尺度小波分解等处理；并根据磁异常特征选择10条剖面进行切线法反演磁性体顶端埋深；选择6条剖面进行2.5D正演拟合,拟合了磁性体的中心埋深、下延深度及厚度。结合地质、物化探资料、岩(矿)石标本磁参数特征和已知铜镍矿的磁异常特征对高精度磁异常进行了推断解释,推断了已知铜镍矿引起的异常2个,找矿有望异常5个,含磁铁矿辉长辉绿岩引起的异常1个,隐伏基性岩体引起的异常2个,浮土干扰异常4个,性质不明异常2个。其中推断的M18号磁异常经钻探验证见到了铜镍矿体。从而为测区铜镍矿的寻找指明了方向。本文对进行高精度磁法勘探工作和铜镍矿勘查工作具有一定的借鉴意义。更多还原

【Abstract】 Copper and nickel are important nonferrous metals.FuNing was rich in copper-nickel ore.Previous results show that there were 15 copper-nickel ore,mineral occurrence and mineralized points deposited in the study area. It shows that prospecting perspective of copper-nickel in Funing is very good. Boxin Mining Industry Group of Yunnan entrusted Kunming University of Science and Technology with high precision magnetic survey for copper-nickel ore in the study area.Pyrrhotite,pentlandite and chalcopyrite are main mineral in Funing. The magnetic difference between mineral and surrounding rock is great which is indispensable conditions in carry out high precision magnetic survey.The magnetic survey have accomplished 80 survey line,the line space is 50 m, the dot pitch is 20 m, the total length is 102.2Km, the control area is 5.2Km2. The magnetic survey have collected 6080 magnetic data, collected 30 rock specimens and specimen of ore.On the basis of geological, geophysical and geochemical data, this paper summarized the geological characteristics of regional geology and survey area. This paper introduced field data collection of high precision magnetic survey and the quality of data, introduced characteristics of magnetic parameters and electrical parameters and anomalous character of known copper-nickel ore.This paper delineated 16 high precision magnetic anomaly and carried out 3-D transformation of magnetic anomaly in frequency domain,up continuation,multi-scale wavelet towards magnetic anomaly. According to magnetic anomaly characteristics selected 10 profile carring out tangent method to inversion burial depth of magnetic substance, selected 6 profile carring out 2.5-D forward fitting burial depth, extended downward depth and thickness of magnetic substance.This paper have proceed interpretation combining geological, geophysical and geochemical data,characteristics of magnetic parameters with anomalous character of copper-nickel ore. It deduced 2 known copper-nickel ore anomaly,5 anomaly which is hopfully caused by copper-nickel ore,1 anomaly which may be gabbro-diabase containing magnetite,2 anomaly which may be buried basic rock,4 anomaly which may be quick soil or interference and anomaly which is character unknown.Copper-nickel ore is founded in M18 anomaly after drilling inspection.This is show clearly direction for exploration of copper-nickel ore in study area. This paper is meanful to carry out high precision magnetic survey and explore copper-nickel ore.更多还原