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首页> 美国政府科技报告 >Geology of the Uranium Deposits Related to the sub-Athabasca Unconformity, Saskatchewan
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Geology of the Uranium Deposits Related to the sub-Athabasca Unconformity, Saskatchewan

机译：与萨斯喀彻温省亚萨巴斯卡不合格有关的铀矿床地质情况

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The Athabasca Basin is a large, oval, dish-shaped structure, 425 km by 225 km (80 000 km exp 2 ) containing about 1500 m of mainly flat-lying quartz-rich sandstone of the Athabasca Group. The basin lies with marked angular unconformity across a Hudsonian basement of deformed and metamorphosed Archean and Aphebian sedimentary, volcanic and plutonic rocks trending north to northeast beneath the basin. In the Carswell Circular Structure in the central western half of the basin rocks are brought to surface through 1200 m of sandstone. The rocks of the basin are less than one percent exposed. Overburden locally reaches 90 m thick. Uranium deposits have been found near the southeast edge of the basin, within the Carswell Circular Structure, and along the northern rim of the basin. They are (1) at the unconformity as high-grade masses elongated in and parallel to major faults, hosted mainly in highly-altered white clay feldspar-rich basement rocks and associated with graphitic metasediments and calc-silicate rocks; (2) within the first 40 m above the unconformity in grey to black and multicoloured Athabasca sandstones and shales as a coating on quartz grains, as disseminations in the clay matrix and as veins; and (3) within 100 m below the unconformity as fracture fillings and disseminations in basement rocks. (Atomindex citation 15:005673)

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