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首页> 外文期刊>Journal of Environment and Earth Science >Geochemical Dispersion of Elements and Their Correlation with Gold in the Regolith at the Tetteh Prospect of the Chirano Gold Mines in the Sefwi Belt of the Birimian, Southwestern Ghana
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Geochemical Dispersion of Elements and Their Correlation with Gold in the Regolith at the Tetteh Prospect of the Chirano Gold Mines in the Sefwi Belt of the Birimian, Southwestern Ghana

机译：加纳西南部Birimian塞夫维带奇兰诺金矿的特兰特矿区特格特矿区元素的地球化学扩散及其与金的关系

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The processes controlling gold (Au) mineralization in Chirano, a gold prospect in south-western Ghana have been investigated using a detailed geochemical dataset of 45 variables from 197 sampling locations. The data were subjected to advanced statistical analyses and bivariate graphical interpretations in the light of the underlying lithology. Four processes of significance have been identified from the multivariate analysis in terms of the geochemistry of the soil in the area. The most important process accounts for almost half of the total variance in the dataset and also correlates strongly with Au. Although Arsenic (As) registers the highest loading under this factor, Aluminium (Al), Silver (Ag), Manganese (Mn), Copper (Cu), and Iron (Fe) record higher correlations and could serve as better pathfinders than As in the study area. This study also shows that there is a second, less prominent process contributing to the availability of Au in the area. This process ranks third amongst the processes of significance in terms of the geochemistry, and correlates negatively with As, suggesting that the latter is not suitable as a pathfinder for Au in the traditional sense. However, since this third process is weaker compared to the first, the implication of this interpretation may be limited to only some locations in the study area. In addition to the revelations from the multivariate statistics, the regolith in the study area has evolved over the years and therefore the changes in regolith should be factored into the exploration protocols. The pre-existing preserved surfaces were found to be masked predominantly by transported materials consisting of ferruginized and exotic sediments. Within the surficial regolith and especially in the Fe-oxyhydroxide rich horizons, Au concentrations increase to significant values that are higher than those of the bedrock or saprolite thereby showing the significant Au re-distribution within the regolith. This study also highlights the apparent Au depletion in the mottled clay zones and in the saprolite and the enrichment of the metal in lateritic residuum and the topsoil. The high Au expressions in the upper parts of the regolith generally are transported whereas the residual soil anomalies have low Au concentrations and do not merit further exploration follow up. Keywords: Regolith, Gold mineralization, Pathfinder elements, Chirano mine, Sefwi belt, southwestern Ghana.
机译：已使用来自197个采样点的45个变量的详细地球化学数据集，对控制Chirano（加纳西南部的金矿前景）中金（Au）矿化的过程进行了研究。根据基础岩性，对数据进行了高级统计分析和双变量图形解释。从该区域土壤的地球化学方面进行的多元分析已确定了四个重要过程。最重要的过程几乎占数据集中总方差的一半，并且也与Au密切相关。尽管在此因素下砷（As）的负载最高，但是铝（Al），银（Ag），锰（Mn），铜（Cu）和铁（Fe）的相关性更高，并且可以比As中更好的探路者。学习区。这项研究还表明，还有第二个不太突出的过程有助于该地区的金的获得。就地球化学而言，该过程在重要过程中排名第三，并且与As呈负相关，这表明As不适合作为传统意义上Au的探路者。但是，由于与第一个过程相比，第三个过程较弱，因此该解释的含义可能仅限于研究区域中的某些位置。除了来自多元统计的启示外，研究区的重钙体已经发展了多年，因此应将重钙体的变化纳入勘探方案中。发现预先存在的保存表面主要被铁素化和稀有沉积物组成的运输材料所掩盖。在表层灰岩中，特别是在富氧羟基氧化物的地层中，Au的浓度增加到显着高于基岩或腐泥土的值，从而显示出Au在重灰岩中的显着重新分布。这项研究还强调了斑驳的粘土区和腐泥土中明显的金耗竭，以及红土残渣和表土中金属的富集。一般在灰泥岩上部的高Au含量被输送，而残留的土壤异常具有低的Au浓度，不值得进一步勘探。关键词：Regolith，金矿化，探路者元素，Chirano矿，Sefwi带，加纳西南部。

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