对松辽盆地钱家店凹陷铀成矿作用的重新认识

钱家店凹陷中的含矿层位主要为上白垩统姚家组，前人认为其中的红色砂岩为原生成因，但大量的证据证实砂岩原生应以灰色为主，红色砂岩为后生氧化蚀变造成，并控制着钱家店铀矿床铀矿化的产出。在此基础上建立该矿床的后生蚀变分带，依次为红色蚀变带、黄色蚀变带、灰白色蚀变带、过渡带、原生带，红色蚀变带为主要的氧化带，铀矿化主要集中在过渡带。平面上铀矿化主要分布于层间氧化带前锋线附近的位置，并在氧化舌状体的前端和两个氧化舌状体之间存在铀的富集。文章最后还建立了该矿床的成矿模式，并对区域上层间氧化带的展布进行了讨论。

Re Disscussion on Uranium Metallogenesis in Qianjiadian Sag, Songliao Basin

Ore-bearing sequence of the Qianjiadian sag is the Upper-Cretaceous Yaojia Formation.Predecessors considered that the red sandstone in this area was original in genesis.But a great volume of evidence substantiates that primary sandstone is gray and the red sandstone resulted from epigenetic oxidation aleration and controls the distribution of uranium metallogenesis.Our research divided the deposit into epigenetic altered zone,consisting of red,yellow and light grey altered zones,transitional zone;and original zone,in which the red altered zones are main oxidization zone and uranium mineralization occurred mainly on the transitional zone.The uranium mineralization on the plane is distributed mainly near the front line of the interlayer oxidation zones.Uranium is always concentrated in the front area of lingulate oxidation zone and areas between two adjacent lingulate oxidation zones.At last,the study proposed a metallogenetic model for the Qianjiadian uranium deposit and discussed the distribution of the regional interlayer oxidation zone.