摘要
从古构造、古地理重塑入手,系统分析伊犁盆地各沉积时期的沉积建造特征,并探讨其与砂岩型铀矿的关系。研究表明,伊犁盆地双基底建造形成了盆地的富铀基底,盆地早—中侏罗世在弱伸展环境下形成的暗色含煤碎屑岩建造成为盆地的含矿建造形成期,盆地晚白垩世—新近纪在弱挤压环境下形成的红色碎屑岩建造有利于铀的后生改造富集成矿。经统计分析表明,伊犁盆地砂岩型铀矿化与含矿层的沉积相类型、单层砂体厚度及岩性结构等建造特征密切相关。
Starting with the remoulding of palaeostructure,palaeo-geography,Yili Basin are systematically analyzed and their influence on sandstone-type uranium mineralization is discussed in this paper.It＇s proved that the double basements are uranium,and the coal bearing clastic formation formed in the weak extensional tectonic background of Middle-Lower Jurassic is favorable for sandstone-type uranium mineralization,and the red clastic formation formed in the weak compressive tectonic background of Late Cretaceous—Neogene is favorable for epigenetic reworking and uranium concentration.The statistics indicate that the uranium mineralization in Yili Basin is related to the type of sedimentary facies,thickness of single sand body and lithological correlation.
出处
《世界核地质科学》
CAS
2011年第1期1-5,共5页
World Nuclear Geoscience
关键词
伊犁盆地
砂岩型铀矿
沉积建造
Yili Basin
sandstone-type uranium deposit
sedimentary formation
