伊犁盆地阔斯加尔地区西山窑组下段岩性岩相特征及与铀成矿关系  

Lithology-lithofacies Characteristics and It's Relationship to Uranium Deposit of Lower Xishanyao Formation in Kuosijiaer Area of Yili Basin

作　　者：邱余波[1,2] 伊海生[3] 张占峰[2] 王果[1,2] 刘俊平[2] 蒋宏[2] 张虎军[2] 李彦龙[2] 郝以泽[2] 

机构地区：[1]成都理工大学核技术与自动化工程学院,成都610059 [2]核工业二一六大队,乌鲁木齐830011 [3]成都理工大学沉积地质研究院,成都610059

出　　处：《沉积学报》2015年第4期687-696,共10页Acta Sedimentologica Sinica

基　　金：全国铀矿资源调查评价计划项目"新疆伊犁盆地南缘可地浸砂岩型铀矿远景调查"(编号:1212011220775);整装勘查关键基础地质研究计划项目"新疆伊犁盆地砂岩型铀矿整装勘查区关键基础地质研究"(编号:12120114007601)联合资助

摘　　要：研究伊犁盆地阔斯加尔地区含铀层系西山窑组下段的岩性岩相特征,总结其与铀成矿的关系,为该区下一步铀矿地质勘查提供理论依据。根据研究区西山窑组下段岩性特征、二维连井剖面特征、砂体发育特征、岩相平面结构展布特征,结合整个盆地南缘的沉积地质背景,阔斯加尔地区主要赋矿层位中侏罗统西山窑组下段下亚段主要为扇三角洲前缘沉积,并发育有朝北和北东方向展布的水下分流河道以及河道间的水下分流间湾等沉积微相。通过对研究区目的层段岩性岩相与铀成矿关系的研究,阔斯加尔地区西山窑组下段赋存的铀矿体主要受分流河道砂体展布方向、分流河道砂体厚度、沉积作用的水动力、沉积微相的形态或突变,以及沉积期后的构造演化等因素的控制。Studying lithology-lithofacies characteristics of Lower Xishanyao Formation, the main uranium-bearing stra- tum, in Kuosijiaer area of Yili Basin, summarizing it＇ s relationship to uranium deposit, it will provide important theo- ry evidence for following uranium exploration in the study area. Based on the characteristics of lithology, lithofacies structure of connecting-well profile, development of sand bodies, plane distribution of lithofacies structure, and com- bined with sedimentary geological features of the whole southern margin of Yili Basin, our analysis suggests that the sedimentary subfacies of mainly ore-bearing layer, the Lower sub-member of Lower Xishanyao Formation Middle Juras- sic in Kuosijiaer area was fan delta front, and sedimentary micro-facies including the underwater distributary channel with distribution direction towards north and northeast and interdistributary estuary was further detected. Through the study of relationship between lithology-lithofacies characteristics and uranium deposit of target intervals in the study ar- ea, the uranium ore bodies occurred in Lower Xishanyao Formation in Kuosijiaer area were mainly controlled by the distribution direction of distributary channel sandbody, the thickness of distributary channel sandbody, the hydrody- namics of sedimentation, the shape or sudden change of sedimentary micro facies, and the post-sedimentary tectonic evolution.

关 键 词：伊犁盆地南缘 阔斯加尔地区 西山窑组下段 砂岩型铀矿 岩性岩相 

分 类 号：P534.52[天文地球—古生物学与地层学]