伊犁盆地南缘水西沟群第Ⅶ旋回可地浸砂岩型铀矿的发现

Discovery of in?situ leachable sandstone-type uranium deposit in Ⅶ cycle of Shuixigou group,southern margin of Yili basin

本文简述了伊犁盆地南缘可地浸砂岩型铀矿找矿历史及第Ⅶ旋回铀矿的发现过程。笔者认为 ,本区可地浸砂岩型铀矿控矿的两个最重要因素是目的层存在疏松的可渗流砂体和含铀含氧地下水的持续补给 (即层间氧化带发育 )。铀矿体主要产于目的层砂体层间氧化带尖灭部位。层间氧化带发育的层位一般都含矿 ,在其尖灭带 ,往往矿体规模、形态。

This paper briefly introduces the discovery of in-situ leachable sandtone-type uranium deposits in the Ⅶ cycle at the southern margin of Yili basin.Authors suggest that uranium deposits in the area are controlled by two most important factors--the loose permeable sandstone body in target horizon and the continuous recharge of uranium-bearing and oxygen-bearing ground water (the case for the development of interlayer oxidation zone).Uranium ore bodies are localized at the pinch out site of interlayer oxidation sandstone body in target horizon.Horizons where interlayer oxidation zone occurs is usually uranium-mineralized.However,the size of uranium ore body,the thickness and the grade at pinch out site change from place to place.