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GIS-Based Spatial Analysis of Regional-Scale Structural Controls on Gold Mineralization Along the Bétaré-Oya Shear Zone, Eastern Cameroon
Natural Resources Research ( IF 4.8 ) Pub Date : 2020-05-16 , DOI: 10.1007/s11053-020-09695-3
Salomon César Nguemhe Fils , Mumbfu Ernestine Mimba , Brunot Nyeck , Melvin Tamnta Nforba , Boniface Kankeu , Philippe Njandjock Nouck , Joseph Victor Hell

Bétaré-Oya is one of the gold mining districts in the eastern region of Cameroon. Structural controls on gold mineralization were examined along the Bétaré-Oya Shear Zone, providing further clues on favorable areas for mineral exploration. GIS-based methods combining point pattern (i.e., quadrat count, Fry analysis) and distance distribution analysis were employed here to delineate the spatial patterns of known gold deposits and to evaluate their spatial association with geological structures. Results show that the gold deposits in this area are spatially clustered. At the regional scale, the Fry plot indicates an alignment of deposits, suggesting that gold mineralization is controlled by structures oriented NNE–SSW and NE–SW. At the deposit scale, an alignment is also evident, indicating that the mineralization is also controlled by ENE–WSW-trending structures. The cumulative relative frequency distribution of distances from lineament features to gold occurrence points (DM) and to non-occurrence points (DN) ratio (DM/DN) was used to rank these two major structural trends and their relative importance as mineralization control. The yielded grades show that NE–SW-trending lineaments, akin to P-type structures, play a major role in controlling the gold mineralization in the area compared to other structures. Beyond the goal to foster mineral prospection in the Bétaré-Oya gold district, information yielded in the present study provides relevant criteria for further exploration in the eastern region of Cameroon.



中文翻译:

基于GIS的喀麦隆东部Bétaré-Oya剪切带金矿化区域尺度结构控制的空间分析

贝塔雷奥亚(Bétaré-Oya)是喀麦隆东部地区的金矿区之一。在Bétaré-Oya剪切带上对金矿化的结构控制进行了检查,为有利的矿产勘探领域提供了进一步的线索。在这里,基于GIS的方法结合了点模式(即方差计数,Fry分析)和距离分布分析,以描绘已知金矿床的空间模式并评估其与地质结构的空间联系。结果表明,该地区的金矿床在空间上是聚集的。在区域尺度上,Fry图表明了矿床的排列,这表明金矿化是由面向NNE–SSW和NE–SW的结构控制的。在存款规模上,一致性也很明显,表明矿化也受ENE–WSW趋势结构控制。从线条特征到金出现点的距离的累积相对频率分布(D M)与非出现点(D N)之比(D M / D N)用于对这两个主要结构趋势及其作为矿化控制的相对重要性进行排名。产出品位表明,与其他结构相比,类似于P型结构的NE–SW趋势谱系在控制该地区的金矿化中起主要作用。除了在Bétaré-Oya黄金地区促进矿产勘探的目标之外,本研究中获得的信息还为喀麦隆东部地区的进一步勘探提供了相关标准。

更新日期:2020-05-16
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