松辽盆地西斜坡江桥-哈拉海青山口组铀成矿条件

Metallogenic condition of uranium deposit for Jiangqiao-Halahai Qingshankou Formation in the west slope area of Songliao Basin

通过分析松辽盆地西部斜坡区江桥—哈拉海一带青山口组铀成矿背景、铀成矿条件、铀异常信息,认为该区域具有丰富的铀源和平缓的单斜构造、曲流河沉积体系,泥-砂-泥地层结构完整,补-径-排机制较完善,具备优越的砂岩型铀矿成矿地质条件。区内18个石油井在青山口组砂体中发现了放射性异常,呈SN向带状展布,经钻探取样分析,最高铀品位达0.012%。电子探针测试结果显示,铀(U)元素以吸附态和铀矿物两种状态赋存,铀矿物主要包括为铀石、沥青铀矿,说明该区域青山口组具较好的铀矿找矿前景。

On the basis of analysis of the uranium metallogenic background,uranium metallogenic condition and uranium anomaly information of Qingshankou Formation in Jiangqiao-Halahai area on the western slope of Songliao Basin,it is considered that the area has abundant uranium source,gentle monocline structure and meandering river deposition system,complete mud-sand-mud formation structure,relatively perfect compensation-runoff-drainage mechanism,and the superior geological condition for sandstone-type uranium mineralization.At eighteen oil wells in the area there have been discovered for radioactive anomalies in the sandstone of the Qingshankou Formation,which are distributed in a SN belt.The highest uranium grade is 0.012%after drilling sampling and analysis.The electron probe test result shows that uranium element occurs in two states,adsorption state and uranium mineral state.Uranium minerals mainly include uranite and pitchblende.It is indicated that there is a good prospecting prospect of uranium deposit for the Qingshankou Formation in this area.