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首页> 外文期刊>Journal of African Earth Sciences >Petrographic and mineralogical study of extended outcrops of lignite layers in Agbor area, southern Nigeria
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Petrographic and mineralogical study of extended outcrops of lignite layers in Agbor area, southern Nigeria

机译：尼日利亚南部阿格博尔地区褐煤层扩展露头的岩石学和矿物学研究

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摘要

Coal layers up to 1 m thick, exposed mainly on river banks in the vicinity of Agbor, Okhuokhuo and Ubiaja, Southern Nigeria, were examined by means of organic petrology, mineralogy and geochemistry, in order to gain coal quality data and understand the palaeoenvironmental conditions during peat accumulation in the broad area of the Ogwashi-Asaba Formation. The obtained results show that coal is of low-rank C; it overlies mainly claystone derived from flooding of branches of the palaeo-Niger River. The precursor peat was accumulating in mires under mesotrophic to ombrotrophic, anoxic conditions. The peat-forming vegetation represented mainly herbaceous plants with minor tree contribution. Though the number of studied samples is low, the distribution of the lignite layers extends further towards N.NW of the known lignite-bearing area. Taking into consideration the low ash yields of some samples, there are encouraging indications for notable lignite deposits of high quality. The mineralogical composition and the activity concentrations of( 238)U, Ra-226, Th-232 and K-40 exclude any severe environmental effect from coal exploitation. Due to all these promising evidences, a detailed exploration in these and between these outcrops is recommended in order to estimate the lignite potential hosted in this area.
机译：通过有机岩石学，矿物学和地球化学检查了厚度最大为1 m的煤层，这些煤层主要暴露于尼日利亚南部阿格博尔，奥克霍霍霍和乌比亚贾附近的河岸上，以获取煤质数据并了解古环境条件在Ogwashi-Asaba组广泛区域的泥炭堆积过程中。所得结果表明，煤的碳含量低。它主要覆盖源自古尼日尔河支流洪水的粘土岩。在中养至非养养性缺氧条件下，前体泥炭堆积在泥潭中。形成泥炭的植被主要是草本植物，树木贡献较小。尽管所研究样品的数量很少，但褐煤层的分布进一步向着已知褐煤承载区域的N.NW延伸。考虑到一些样品的灰分产率低，令人鼓舞的迹象表明有高质量的褐煤矿床。 （238）U，Ra-226，Th-232和K-40的矿物学组成和活性浓度排除了煤炭开采对环境的任何严重影响。由于所有这些有前途的证据，建议对这些露头和这些露头之间进行详细的勘探，以估计该地区的褐煤潜力。

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  • 来源
    《Journal of African Earth Sciences》 |2020年第4期|103659.1-103659.14|共14页
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  • 作者单位

    Delta State Univ Dept Geol PMB 1 Abraka Nigeria;

    Univ Patras Dept Geol 265-04 Rio Patras Greece;

    Fed Univ Petr Resources Dept Earth Sci PMB 1221 Effurun Nigeria;

    Univ Patras Dept Chem 265-04 Rio Patras Greece;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Coal petrology; Palaeoenvironmental reconstruction; Lignite; Nigeria;

    机译：煤炭岩石学;古环境重建;褐煤;奈及利亚;

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