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首页> 外文期刊>Brazilian Journal of Geology >A mineral potential mapping approach for supergene nickel deposits in southwestern S?￡o Francisco Craton, Brazil
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A mineral potential mapping approach for supergene nickel deposits in southwestern S?￡o Francisco Craton, Brazil

机译：巴西西南弗朗西斯科·克拉顿西南部超表层镍矿床的矿物势测图方法

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Southwestern S?￡o Francisco Craton makes limit with Bras?-lia thrust-fold belt and involves rocks from Archean to formed during the Brasiliano-Pan Africano Neoproterozoic event, including a mafic-ultramafic belt (Morro do Ferro Greenstone Belt) hosted along the Archean counterpart. This greenstone belt hosts two-nickel deposits (Morro do N?-quel and O'Toole, respectively silicate and sulfide types) and occurrences. This study applies an empirical-conceptual model for lateritic nickel deposits formation into geographic information systems with aerogeophysical data (magnetic and gamma-spectrometry) and digital elevation models (terrain relief and slope). Our contribution aims for nickel deposits favorability mapping using a simple mathematical operator over a supporting spatial database translating the conceptual exploration model into evidential layers for geological processes involved on deposit formation. Evidential layers constructed for identification of elements pertaining the supergene nickel mineral system are given by analytic signal amplitude maps, thorium over potassium ratio images, and digital elevation models and slope maps, derived from shuttle radar topography mission digital elevation models. Evidential layers integration through binary layers algebraic sum identified effectively known deposits and occurrences with its outputs highlighting possibilities for unknown resources in this under-explored terrain.
机译：西南S？Franciscoo Francisco Craton限制了Bras？-lia逆冲褶皱带，涉及从太古宙到Brasiliano-Pan Africano新元古代事件期间形成的岩石，包括沿该岩层带承托的镁铁质超音速带（Morro do Ferro Greenro Belt）太古代的同行。这块绿岩带有两个镍矿床（Morro do N′-quel和O'Toole分别为硅酸盐和硫化物类型）和矿床。这项研究应用了经验概念模型，用于将红土镍矿形成到具有航空地球物理数据（磁和伽马能谱法）和数字高程模型（地形起伏和坡度）的地理信息系统中。我们的贡献旨在在支持的空间数据库上使用简单的数学运算符，对镍矿的有利程度进行映射，该空间数据库将概念性勘探模型转化为与矿床形成有关的地质过程的证据层。分析信号振幅图，th钾比图像，数字高程模型和坡度图（从航天飞机雷达地形任务数字高程模型派生而来）给出了用于识别与表层镍矿元素有关的元素的证据层。通过二元层代数和的证据层集成可以有效地识别已知的矿床和矿床，其输出突显了该勘探不足地形中未知资源的可能性。

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