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矿床地质  2010 

661铀矿床矿石U-Pb等时线年龄及其成矿构造背景

Keywords: 地质学,赣杭构造带,火山岩型铀矿床,U-Pb等时线年龄,661铀矿床

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Abstract:

661铀矿床位于赣杭构造火山岩铀成矿带东段大洲铀矿田内,矿体赋存于磨石山群九里坪组流纹岩之中,矿床定位于岩石圈伸展断陷盆地附近,明显受断裂带的控制。利用矿石U-Pb等时线法确定了该矿床两个矿体的成矿时代,分别为(107.0±2.3)Ma和(110.0±3.5)Ma。这些年龄值与断陷红盆底部发育的玄武岩的成岩年龄一致,也与东南沿海地区明显存在的110Ma基性脉岩拉张活动的时间一致,表明岩石圈伸展与铀成矿之间具有良好的对应关系,为岩石圈伸展期与铀成矿关系研究提供了年代学证据。岩石圈伸展控制着富CO2热液形成的时间,因而也大致控制了铀成矿的时代。

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