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首页> 外文期刊>Journal of Earth Sciences and Geotechnical Engineering >Identification of a Schist-Micaschist Transition under a Lateralitic Cover of the Bafia Group, Centre Cameroon, using DC Electrical Resistivity Soundings
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Identification of a Schist-Micaschist Transition under a Lateralitic Cover of the Bafia Group, Centre Cameroon, using DC Electrical Resistivity Soundings

机译：使用直流电阻率测深法确定喀麦隆中部巴菲亚集团红土掩盖下的片岩-弥散岩过渡

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摘要

The shallow subsurface structure along a profile on the Bafia Group in Cameroon has been investigated using data from both DC electric method and pedologic logs. The combination of these approaches aims to resolve the non-uniqueness of solution inherent to inverse problems in geosciences. Results show that the bedrock is located at depth between 11 and 25 m along the line and is overlain from the surface by a thin organo-mineral lateritic cover, an aggregated sandy clay layer, and an altered schistose layer. However, the bedrock displays a change in electrical properties moving from the south (1400 Ωm) to the north (2500 Ωm) of the profile. This observation is correlated with the presence of mica minerals found in logs of pit 1, located in the south of the profile, and its absence in pit 2 in the north. The change in composition resulting to the variation in electrical propertities of the bedrock could be associated to the shallow effect of the Sanaga Faults, known as a major tectonic structure crossing the region. The sandy-clay layers with thicknesses range 1-5 m is believed to represent a potential thin aquifer, due to the resistivities range 15-100 Ωm, common to some aquifers.
机译：沿喀麦隆巴菲亚群剖面上的浅层地下结构已经使用直流电法和岩石学资料进行了调查。这些方法的组合旨在解决地球科学中反问题固有的解的非唯一性。结果表明，基岩沿线位于11至25 m的深度处，表面覆盖着一层薄薄的有机矿物红土覆盖层，聚集的砂质粘土层和蚀变的片状糖层。但是，基岩显示出电气特性的变化，从剖面的南部（1400Ωm）向北部（2500Ωm）移动。该观察结果与在剖面南侧的坑1的原木中发现的云母矿物的存在以及在北部的坑2的不存在云母有关。导致基岩电气性质变化的成分变化可能与Sanaga断层的浅层效应有关，后者被称为穿越该地区的主要构造构造。厚度范围为1-5 m的沙质粘土层被认为是潜在的薄含水层，这是由于某些含水层共有的电阻率范围为15-100Ωm。

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