低纬度地区磁异常化极技术在铬铁矿勘查中应用——以柬埔寨王国菩萨省布蔑地区为例  

The application of Reduction to the Pole of Magnetic anomalies at low latitude in Chromite deposit survey——the case of Puokmea Area Pursat Province of Cambodia

作　　者：胡庆辉 HU Qing-hui(No.4 Geological Team of Shandong Bureau of Geology and Mineral Resources,Weifang 261021)

机构地区：[1]山东省第四地质矿产勘查院

出　　处：《矿产勘查》2019年第7期1679-1686,共8页Mineral Exploration

基　　金：国外矿产资源风险勘查专项资金项目柬埔寨王国菩萨省瓦腕县布蔑地区铬铁矿靶区优选与评价资助

摘　　要：磁异常化极转换是磁测资料解译的重要环节。相同地质条件下,由于近水平磁化的影响,低纬度地区磁异常形态比高纬度地区要复杂,主要表现为负异常明显,伴生异常增多,传统化极处理会导致特定方向上明显的"幅值放大",出现"极值条带",严重影响磁测资料的解译精度。对近年来资料的综述表明,"阻尼因子法"可以较好地实现低纬度地区磁测资料的化极处理,满足地质解释的需要。将该化极方法应用在柬埔寨布蔑地区铬铁矿普查项目中,化极磁异常明确指示了超基性岩体的分布范围,为后续勘查工作提供了详实依据。Reduction to the pole of magnetic anomalies is an important part of magnetic data interpretation.Under the conditions of the same geological background,magnetic anomalies will be more complicated at low latitude than at high latitude due to the almost horizontal magnetizing.More negative and accompanying anomalies will be shown in contour map.Traditional data processing will lead to obvious amplitude blow-up in given direction and cause peak belt.It will be severely disrupted the magnetic data interpretation.By means of reviewing the files of recent years,reduction to the pole with damping factor method can be better fulfilled the magnetic data processing at low latitude and meet the geologic demand.It has been effectively applied in Chromite deposit survey of Puokmea Area.Magnetic anomalies clearly indicate the distribution range of ultrabasic rock and provide full and accurate basis for the follow-up prospecting job.

关 键 词：低纬度 磁异常 化极 铬铁矿 

分 类 号：P631.2[天文地球—地质矿产勘探]