内蒙古通辽地区姚家组沉积特征与铀成矿关系探讨

Sedimentary Characteristics and Its Relationship with the Uranium Mineralization of the Yaojia Formation in Tongliao area,Inner Mongolia

内蒙古通辽地区是我国北方重要的铀矿资源基地,近年来随着勘查投入持续加大,铀矿找矿不断取得新突破。为了深化对通辽地区砂岩铀矿控矿因素的认识,进一步扩大铀矿找矿成果,通过岩(矿)心观察、文献调研和综合分析等方法,对通辽地区找矿目标层姚家组的沉积特征进行了系统研究和总结,提出了姚家组沉积时期古气候经历了较湿热向半温湿的变迁,发育盆地拗陷期湖盆长轴方向冲积扇-河流-浅水三角洲-湖泊沉积体系,灰色砂体受次级凹陷控制等创新性认识,探讨了沉积对铀成矿的控制作用。

Tongliao area in Inner Mongolia is an important uranium resource base in northern China,and several uranium prospecting breakthrough have been achieved by the strong financial support in exploration in recent years.In order to deepen the understanding of the ore-controlling factors of the uranium mineralization and expand the prospecting achievements,systematic analyses and summary on the sedimentary characteristics of the target-Yaojia Formation have been carried out,by the application of geological and ore core observation,literature researches and comprehensive analyses.We suggest that it was evolved from hot,humid climate to semi-humid climate during the sedimentation of the Yaojia Formation.The alluvial fan-stream-shallow water delta-lacustrine sediment systems occurred along the long-axis during the basin depression and the gray sandstone body was controlled by the secondary depression.The control of the sedimentation on uranium formation has also been discussed.