摘要
查汗通古凹陷为库米什盆地北西端一个山间小凹陷,位于富铀古生代花岗岩基底之上。中侏罗统西山窑组赋存有厚度巨大的超低品位砂岩型铀矿化。从铀源、含矿建造、构造演化、氧化带、铀矿化特征等方面进行论述,认为该区铀源丰富。西山窑组属一套冲积扇体系的含碳碎屑岩建造,砂体发育,含矿层为第二、第三、第四等3个岩性段。构造演化上存在中侏罗世、渐新世两次沉降接受沉积过程,及晚侏罗—始新世、中新—全新世两次抬升剥蚀过程。西山窑组第一、第五岩性段发育面状潜水氧化带,第二、第三、第四等3个岩性段局部发育氧化带,铀矿化产于氧化-还原过渡带附近,多为砂岩型,少量泥岩型。成矿后压实与构造挤压作用使砂体胶结致密,现有技术条件下难以地浸开采铀。
Chahantonggu sag which located above the Paleozoic granitoid basement is a inter-mountain small sag in the northwest of. The Xishanyao group in middle Jurassic forms large area of thickly sandstone type uranium mineralization of very low-grade ore.The paper discusses the uranium metallogenetic as follows：the uranium sOurce, the producing formation, the tectonic evolution, the oxidized zone,the uranium mineralized characteristics and so on.The sag wasrich in uranium source,Xishanyao group is carbon-beating elastic rock building, steady sand body has more carbon,the ore-bearing layer is the second,third and forth rock sections.They have two subesidences and accept sedimentations in J2 and E3,two uplifts and suffer corrode in J3-E2 and N1-Q in tectonic evolution course, the Xishanyao group had planar dive oxidized with the first and fifth rock sections,partial oxidized zone with the second,third and forth rock sections.The uranium mineralization from the zone of oxidized-reduced transition, which major in sandstone type, a few mudstone type. Deficiency is the time of interstratified oxidized mineralization in the Chahantonggu sag may be very short,mineralization mater disperses in the huge sand bodies,Uranium mineralization reached grade are present thin layer only, and has considerable resources reserves of uranium.The compaction and tectonic extrusion after mineralization made the sand body cementation and further densification.
出处
《新疆地质》
CAS
CSCD
北大核心
2012年第4期477-481,共5页
Xinjiang Geology
基金
新疆维吾尔自治区地质勘查基金(周转金)项目(2009003)资助
关键词
库米什
查汗通古
凹陷
铀成矿特征
西山窑组
Kumishi
Chahantonggu
Sag
Uranium metallogenic features
Xishanyao group
