摘要
鄂尔多斯盆地晚三叠世延长组长7段是一套深湖相富铀烃源岩,铀含量很高,其矿物学特点是富含胶磷矿、草莓状黄铁矿、有机质等。通过光片、扫描电镜、电子探针、能谱分析、α放射性照相等研究方法,分析了长7段富铀烃源岩中铀的赋存状态,结果表明铀除了以类质同象赋存于胶磷矿中,以及以吸附态赋存于黄铁矿和有机质中以外,还在长7富铀烃源岩中发现铀以独立铀矿物形式存在于胶磷矿中,铀矿物颗粒大小在2~14μm,矿物类型为铀石、含钛铀矿物。两种独立铀矿物的存在表明其生成环境为中低温、还原—强还原环境,认为长7优质烃源岩曾遭受过低温热液作用。总之,长7富铀烃源岩中铀的赋存主要以类质同象、独立铀矿物和离子吸附三种状态存在。
The 7th member of Yanchang Formation 0f Late Triassic in Ordos Basin is a U-rich hy-drocarbon source rocks rich in collophane,frambodial pyrite,and organic matter.In this paper the uranium occurrence in the rock of the Chang-7Member is studied using Ray,Scanning electron microscope,electron microscopy,energy spectrum analysis,and α radiography photo.The result shows that the uranium exists not only in an isomorphism uranium form but also in pyrite and oganic matters in organic matter in an adsorption form.In addition,for the first time,find that the uranium exists incollophane mineral in an independent form of uranium minearal,with the particle size between 2-14μm.It can be roughly divided into two types of uranium minerals： uranium stone,titanium.
出处
《西北地质》
CAS
CSCD
2011年第2期124-132,共9页
Northwestern Geology
基金
陕西省"13115"科技创新工程重大科技专项项目(2008ZDKG-48)
国家重点基础研究发展计划(973)项目(2003CB214608)
西北大学大陆动力学国家重点实验室科技部专项经费资助
关键词
富铀烃源岩
铀的赋存状态
铀矿物
长7段
胶磷矿
黄铁矿
U-rich hydrocarbon source rocks
uranium occurrence
uranium minerals
Chang-7 Member
collophane
pyrite
