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首页> 外文期刊>Canadian journal of earth sciences >Topographic features of the sub-Athabasca Group unconformity surface in the southeastern Athabasca Basin and their relationship to uranium ore deposits
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Topographic features of the sub-Athabasca Group unconformity surface in the southeastern Athabasca Basin and their relationship to uranium ore deposits

机译：阿萨巴斯卡盆地东南部亚阿萨巴斯卡群不整合面的地形特征及其与铀矿床的关系

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摘要

Topographic features of the sub-Athabasca unconformity surface, such as paleovalleys, topographic highs, and fault scarps, have been documented locally in the eastern Athabasca Basin, and available data indicate that they are spatially associated with mineralization. However, the mechanisms by which such topographic features were generated, their size and distribution at the regional scale, as well as their relationship to mineralization, are still not completely understood. A 100 by 60 square kilometre area of the southeastern Athabasca Basin, encompassing the McArthur River, Phoenix, and Key Lake deposits, was selected to study the relationship between these topographic features and U mineralization. In this region three dominant sets of sub-vertical faults were identified on the basis of aeromagnetic data: northeast-trending, north-northwest-trending, and northwest-trending. A detailed three-dimensional (3-D) model of this part of the basin was constructed using data from more than 1200 drill holes. This model reveals numerous dominantly northeast-trending ridges and valleys in the unconformity surface. Among these, a prominent northeast-trending ridge is situated close to the McArthur River - Key Lake deposits trend. Structural interpretation and cross-sections illustrate that the topographic features that have been documented in previous studies are a function of three principal factors: (i) pre-Athabasca group ductile-brittle faulting and alteration; (ii) differential weathering and erosion; and (iii) syn- to post-Athabasca ductile-brittle reactivation of pre-existing graphite-rich ductile shear zones. The topographic features and associated faults may have acted as conduits and barriers to fluid flow and thus controlled alteration patterns and uranium mineralization.
机译：在阿萨巴斯卡盆地东部局部记录了亚阿萨巴斯卡亚不整合面的地形特征，如古椭圆形，地形高点和断层陡坡，现有数据表明它们在空间上与矿化有关。然而，产生这种地形特征的机制，它们在区域尺度上的大小和分布以及它们与矿化的关系仍然没有被完全理解。选择了阿萨巴斯卡盆地东南部一个100 x 60平方公里的区域，该区域涵盖了麦克阿瑟河，凤凰城和Key Lake矿床，以研究这些地形特征与U矿化之间的关系。在该地区，根据航磁数据确定了三个主要的亚垂直断层：东北向，北西北向和西北向。使用来自1200多个钻孔的数据，构造了盆地这一部分的详细三维（3-D）模型。该模型揭示了不整合面中大量的东北向隆起和隆起。其中，靠近麦克阿瑟河（McArthur River）-Key Lake矿床的趋势靠近东北部一个突出的山脊。结构解释和横截面表明，先前研究中已记录的地形特征是三个主要因素的作用：（a）阿萨巴斯卡前期组韧性脆性断裂和蚀变; （ii）不同的风化和侵蚀; （iii）与阿萨巴斯卡球后韧性脆性再活化同时存在的富石墨延性剪切带。地形特征和相关的断层可能已成为流体流动的导管和屏障，从而控制了蚀变模式和铀矿化。

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