伊犁盆地南缘中新生代构造样式与铀成矿关系  

Mesozoic Structural Styles and Their Relationship with Uranium Deposits in the Southern Margin of Yili Basin

作　　者：陈奋雄[1,2] 聂逢君[1] 张成勇[1] 

机构地区：[1]东华理工大学,江西南昌330013 [2]核工业二一六大队,新疆乌鲁木齐830011

出　　处：《地质与勘探》2016年第3期480-488,共9页Geology and Exploration

基　　金：国家重点基础研究发展规划(973计划)(资助号:2015CB453002);整装勘查关键基础地质研究计划项目(编号:12120114007601)资助

摘　　要：伊犁盆地是我国最早发现砂岩型铀矿的地区,近十几年来一直保持砂岩型铀矿找矿的不断突破,盆地南缘自西向东查明了一系列砂岩型铀矿床,这些铀矿床的分布与盆地南缘构造关系密切。本文总结了伊犁盆地南缘构造样式类型,分析了不同构造样式下氧化流体补给、运移规律,并结合铀矿体的空间分布,指出构造样式差异是造成砂岩型铀矿体空间分布的关键因素;从氧化流体补给窗的开启、流体的汇聚和还原性气体聚集的控制等方面讨论了构造样式对铀矿体空间定位的机制,指出单斜稳定地层中纵弯背斜是控制铀空间分布的主要构造,要注意不同构造样式约束下成矿区域的稳定型和地下水补给的多样性,在此基础上讨论了伊犁盆地南缘铀矿的找矿方向及主要矿物类型。The Yili basin is the area where sandstone type uranium deposits were found earliest,keeping constant breakthroughs in discovery of such deposits in the southern margin of the basin. From west to east, a series of deposits have been clarified, of which the distribution is closely related to struc- tural styles. This work summarized the structure style types in this area,and analyzed the characteristics of oxidation fluid supply and migration law in dif- ferent structures. Combined with the spatial distribution of uranium ore bodies, we suggested that the structural style is a key factor to control of the pattern of such ore bodies. Then we discussed the control mechanism of structural styles on the uranium location from the open of the oxidation fluid supply, con- vergence of fluid flows,and gathering of reducing gas. It was pointed out that the longitudinal bending anticline on the stable slope is the main structure controlling the orebody location. It is very important to analyze the regional stable mineralization and diversity of groundwater recharge under the constraints of different structural styles. Finally this work discussed the prospecting direction and the main uranium ore types in this area.

关 键 词：伊犁盆地 砂岩型铀矿 构造样式 纵弯背斜 矿体定位 

分 类 号：P631.3[天文地球—地质矿产勘探]