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首页> 外文期刊>Geochemistry: exploration, environment, analysis >Use of termitaria in surficial geochemical surveys: Evidence for >125-μm size fractions as the appropriate media for gold exploration in northern Ghana
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Use of termitaria in surficial geochemical surveys: Evidence for >125-μm size fractions as the appropriate media for gold exploration in northern Ghana

机译:白蚁在表层地球化学调查中的应用:大于125微米大小的部分作为加纳北部金矿勘探的适当介质的证据

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摘要

Extensive lateritization and widespread sheet wash and alluvial deposits characterize the thick regolith in the savannah regions of northern Ghana. As often is the case in these areas, the presence of these cover materials mask geochemical gold (Au) response in soils during surficial gold exploration. Anomaly detection thus becomes very difficult perhaps due to gold grain encrustation during lateritization and anomaly dilution by sheet wash deposits. Termite mound samples collected from areas of thick regolith, transported overburden and laterite cap in gold bearing areas of northern Ghana which were analyzed for gold defined anomalous zones. Gold contents were determined from size fractions consisting of -125 μm, +125-250 μm, +250-500 μm and +500 μm. The gold contents show relatively insignificant changes in concentration and in repeat samples in the ~- 125 μm and +125-250 μm size fractions, but there were significant differences when sub-samples were re-analysed in the coarser samples. Gold content repeatability was relatively better in the fine size fractions (~- 125 μm) and decreased in the coarser size fractions. The study showed that termite mounds can be used as a geochemical sample medium to support conventional soil surveys especially in areas under thick regolith and transported cover, and the - 125 μm size fraction appears the most appropriate.
机译:加纳北部稀树草原地区广泛的红土化作用和广泛的片状冲刷及冲积物沉积是其特征。与这些地区一样,这些表层材料的存在掩盖了表层金勘探过程中土壤中的地球化学金(Au)反应。因此异常检测变得非常困难,这可能是由于在重新定型过程中结了金颗粒而造成的,以及由于板材洗涤沉积物造成的异常稀释。从加纳北部含金地区的厚白垩纪地区,上覆运土层和红土带盖区收集的白蚁丘样品,分析了金限定的异常区。从-125μm,+ 125-250μm,+ 250-500μm和+500μm的尺寸分数确定金含量。金含量在〜-125μm和+ 125-250μm尺寸级分中,浓度和重复样品中的浓度变化相对较小,但是当对较粗样品中的子样品进行重新分析时,金含量存在显着差异。金含量的可重复性在细粒度部分(〜-125μm)中相对较好,而在粗粒度部分中则降低。该研究表明,白蚁丘可以用作地球化学样本介质,以支持常规的土壤调查,尤其是在重碎屑岩和运输覆盖层下的地区,并且-125μm的粒径似乎是最合适的。

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