新疆尼勒克坳陷侏罗系沉积演化及与铀成矿的关系  

Sedimentary Evolution and Its Relationship to Uranium Deposit of Jurassic in Nileke Depression,Xinjiang

作　　者：邱余波[1] 刘俊平[1] 蒋宏[1] 张占峰[1] 张磊[1] 陈虹[1] Qiu Yubo;Liu Junping;Jiang Hong;Zhang Zhanfeng;Zhang Lei;Chen Hong(No.216 Geologic Party,CNNC,Urumqi,Xinjiang,830011,China)

机构地区：[1]核工业二一六大队,新疆乌鲁木齐830011

出　　处：《新疆地质》2018年第4期513-517,共5页Xinjiang Geology

基　　金：中国核工业地质局铀矿地勘费项目(201608);国家自然科学基金联合基金项目(U1403292)共同资助

摘　　要：尼勒克坳陷位于我国砂岩型铀矿产基地伊犁盆地东北部,具铀源、层间氧化带、地球化学障等砂岩型铀矿成矿条件,由于构造变形较强、工作程度偏低,该区铀成矿潜力不明晰。以铀矿勘查钻孔岩心观测、典型钻孔剖面沉积相分析为基础,结合伊犁盆地构造背景及断陷湖盆演化规律,分析尼勒克坳陷侏罗系沉积演化及铀成矿作用。研究表明,尼勒克坳陷侏罗系主要发育湖泊-扇三角洲沉积,八道湾-三工河沉积期尼勒克地区整体处于浅湖环境,吉林台等局部地区发育有滨浅湖滩坝砂体;西山窑沉积期为扇三角洲-湖泊沉积,发育有较大规模平原沼泽。尼勒克坳陷铀成矿潜力集中于构造相对稳定的吉林台及以西地区,铀矿体赋存于该区西山窑组扇三角洲分流河道砂体中。Nileke depression is located in the northeast of Yili basin,which is a sandstone type uranium mineral base in China.It has the sandstone type uranium ore-forming conditions,such as uranium source,interlayer oxidation zone,and geochemical barrier.Because of its strong structural deformation and low working degree,the uranium metallogenic potential in this area is unclear.The sedimentary evolution and uranium mineralization of the Jurassic in Nileke depression are analyzed on the basis of the core observation of uranium exploration drilling,the sedimentary facies analysis of typical borehole sections,the tectonic setting of the Yili basin and the evolution of the faulted lake basin.The study shows that the Jurassic in Nileke depression mainly developed lake-fan delta deposit,in the sedimentary period of Badaowan-Xishanyao,Nileke area was in shallow lake environment,and the sand body of shallow lake-beach bar was developed in Jilintai and other areas.In the sedimentary period of Xishanyao there was fan delta-lake environment and developed a large scale of swamp.The uranium mineralization potential in Nileke depression is concentrated in the relatively stable Jilintai and its western area,and the uranium deposits were possibly located in the sand body of fan delta distributary channel of Xishanyao Formation.

关 键 词：尼勒克坳陷 侏罗系 沉积演化 砂岩型铀矿 

分 类 号：P534.52[天文地球—古生物学与地层学] P619.14[天文地球—地质学]