Magnetic rocks distribution and depth to basement analysis on an old Quarry Site, Abeokuta, SW Nigeria

IF 1 Q4 GEOSCIENCES, MULTIDISCIPLINARY
A. Ojo, Mubor Adeloye, I. Egbedele, Feyisayo Akinwande
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引用次数: 1

Abstract

Geomagnetic study was carried out to investigate the distribution and depth of formations of different magnetic rocks on an old quarry site, Abeokuta, Southwestern, Nigeria. Eight ground magnetic profiles were established with 10 m spacing intervals orientated in West-East and North-South directions, and ranged between 110 and 190 m. A total of 223 data sets were acquired and corrected for all forms of magnetic variations. The resulting residual anomalies were plotted against distance using Microsoft Excel tool. Also, these anomalies were modeled into 2D and 3D contour sections using Surfer 10. The depth to basement analysis was carried out using Peter’s half slope graphical method. The resulting profiles and contour sections revealed variable anomalies which indicated contrast in the magnetic distributions of the subsurface. Mineral rocks with average (0-150 nT) magnetic susceptibilities dominated the profiles, and this indicated that the study area is on pegmatite or Quartz vein which probably harbored Beryl, Graphite, Sandstone, Quartz, Tantalite and Mica in both massive and disseminated quantities. Regions with high (150-300 nT) and low (0 to -150 nT) magnetic susceptibilities were also observed across the profiles. Mineral rocks with very thin bodies were observed at depths 3.48-17.42 m, intermediate bodies were buried at depths 2.61-13.06 m, while very thick bodies were located at depths between 2.09 and 10.45 m. The depth of the magnetic sources revealed that the major and minor mineral rock contact in the study area.
尼日利亚西南部Abeokuta一个旧采石场的磁性岩石分布和基底深度分析
在尼日利亚西南部Abeokuta的一个旧采石场进行了地磁研究,以调查不同磁性岩石的分布和形成深度。建立了八个地面磁剖面,间隔10米,方向为西-东和北-南,范围在110至190米之间。共采集了223个数据集,并对所有形式的磁变化进行了校正。使用Microsoft Excel工具绘制了所产生的残余异常与距离的关系图。此外,使用Surfer 10将这些异常建模为2D和3D轮廓剖面。基底深度分析采用Peter半斜率图解法进行。所得到的剖面图和等高线剖面显示了各种异常,这表明地下的磁性分布存在差异。剖面中以平均(0-150 nT)磁化率的矿物岩石为主,这表明研究区域位于伟晶岩或石英脉上,可能含有大量和分散的绿柱石、石墨、砂岩、石英、钽铁矿和云母。在剖面上还观察到具有高(150-300nT)和低(0-150nT)磁化率的区域。在3.48-17.42m深处观察到具有非常薄的矿体的矿物岩石,在2.61-13.06m深处埋有中间矿体,而在2.09-10.45m之间的深处则发现了非常厚的矿体。磁源的深度表明,研究区域内的主要和次要矿物岩石接触。
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来源期刊
Iranian Journal of Earth Sciences
Iranian Journal of Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
1.40
自引率
12.50%
发文量
0
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