Ground Magnetic Investigation of Iron Occurrence in the Basement Rocks ofDadoru and Environs, Adamawa Massif, North East Nigeria

A. Yusuf, B. N.E, J. Barka, Y. Yero.U.
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引用次数: 1

Abstract

The study area is located in the northwestern part of the Adamawa massif of northeastern Nigeria and lies between longitude 11 0 50 / E and 12 0 00 / E and latitude 8 0 49 / N and 8 0 55 / N. Lithologies of the area include: granite-gneisses, porphyritic granites, and biotite hornblende gneiss. A G-856 Memory-Mag TM proton precision magnetometer was used to acquire ground magnetic data of the area following a regular grid pattern. The magnetic data were subjected to diurnal correction and contoured using Surfer 11surface mapping software to produce a magnetic map. Areas characterized by anomalous magnetic values (34342 -34348 nT) are interpreted as areas of iron occurrences. The computer software WingLink was been used to generate 2-D subsurface geologic models for the computation of the depths to the anomalous bodies. The average depth to the source of anomalous bodies is 351.67 m, which is interpreted as average depth to iron mineral occurrence. Ground geologic mapping confirmed areas of surface iron occurrences as veins in granite gneiss. Geological investigation of the discovery is suggested to determine the tenor and tonnage for possible economic exploitation as part of Nigeria’s government plan to revitalize the solid mineral/mining industry.
尼日利亚东北部阿达马瓦地块达多鲁及其周边基岩中铁赋存的地磁调查
研究区位于尼日利亚东北部阿达马瓦地块西北部,位于东经11 0 50 / E ~ 12 0 000 / E,北纬80 0 49 / N ~ 80 0 55 / N之间,区内岩性主要有:花岗片麻岩、斑岩花岗岩、黑云母角闪片麻岩。采用G-856 Memory-Mag TM质子精密磁强计,按规则网格模式采集该区域的地磁数据。磁数据进行日校正,并使用Surfer 11地表测绘软件绘制等高线,生成磁图。以异常磁值(34342 -34348 nT)为特征的区域被解释为铁的赋存区。利用计算机软件WingLink建立了二维地下地质模型,计算了异常体的深度。异常体离源的平均深度为351.67 m,解释为距铁矿物产状的平均深度。地面地质填图证实,地表铁矿为花岗片麻岩脉。建议对该发现进行地质调查,以确定可能进行经济开采的数量和吨位,这是尼日利亚政府振兴固体矿物/采矿业计划的一部分。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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