松辽盆地富铀有机质建造发育特征及其对渗出型砂岩型铀矿的制约  

Characteristics of Uranium-rich Organic Matter Formation and Its Constraints on Exudative Sandstone-type Uranium Deposits in Songliao Basin

作　　者：邢作昌 王君贤 吴大坤 宁君[3] 贾立城[1] 刘武生[1] 牟启博 林效宾[1] 田明明[1] XING Zuochang;WANG Junxian;WU Dakun;NING Jun;JIA Licheng;LIU Wusheng;MOU Qibo;LIN Xiaobin;TIAN Mingming(CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology,Beijing Research Institute of Uranium Geology,Beijing 100029,China;Research Institute No.240,CNNC,Shenyang,Liaoning 110032,China;Geologic Party No.243,CNNC,Chifeng,Inner Mongolia 024000,China)

机构地区：[1]核工业北京地质研究院中核集团铀资源勘查与评价技术重点实验室,北京100029 [2]核工业二四〇研究所,辽宁沈阳110032 [3]核工业二四三大队,内蒙古赤峰024000

出　　处：《铀矿地质》2024年第1期105-118,共14页Uranium Geology

基　　金：中核集团集中研发项目“砂岩型铀矿多重耦合地质成矿作用与时空定位”(编号:中核科发2021-143号)资助。

摘　　要：在采用渗出成矿新思路进行松辽盆地砂岩型铀矿勘查时,对盆地中提供铀源的黑色富铀有机质建造研究显得格外重要。文章在系统梳理松辽盆地烃源岩特征的基础上,对松辽盆地富铀有机质建造的产出层位、分布规律与铀含量的研究发现:松辽盆地区域上分布上、中、下3套富铀有机质建造,分别与下白垩统、青山口组底部、嫩江组底部烃源岩对应,其中上部富铀有机质建造对盆地中北部铀成矿作用的影响大,而盆地南部主要受下部富铀有机质建造的制约;松辽盆地铀工业孔空间多产于具有深大断裂沟通的富铀有机质建造铀含量高值中心区边缘,表明富铀有机质建造对松辽盆地砂岩型铀矿化具有明显的制约作用,推断黑色烃源岩不但为铀成矿提供了一定的还原物质,而且可能是砂岩型铀成矿作用的重要的潜在深部铀源。该研究可为以红杂色建造为主的姚家组、四方台组等主攻层位的渗出成矿预测提供“下黑”成矿要素的支持,更好地指导松辽盆地渗出型砂岩型铀矿的勘查。It is particularly important to study the black uranium-rich organic matter formations(UOMF)that provide uranium sources in the basin in exudative sandstone-type uranium deposits in Songliao Basin(SL).Based on a systematic review of occurrence horizon,distribution patterns,and uranium content of UOMF in the Songliao Basin,some conclusions can be draw as follow:Firstly,three sets of UOMFs in Songliao Basin,containing the bottom,middle and top UOMF,correspond to hydrocarbon source rock horizons of the lower Cretaceous,the bottom of the Qingshankou Formation,and the bottom of the Nenjiang Formation.Secondly,the top UOMF and the middle UOMF have a significant impact on uranium mineralization in the central and northern part of SL,while the southern SL is mainly constrained by the lower UOMF.Thirdly,Uranium industrial production boreholes are mainly located at the edge of the relatively high uranium content of UOMF connected by deep and large boundary faults,and this facts shows that the UOMF has a significant constraint on the sandstone type uranium mineralization in SL.It was inferred that black hydrocarbon source rocks not only provided certain reducing substances for uranium mineralization,but also may be an important potential uranium source for sandstone type uranium mineralization.This study can provide support for the"lower black"oreforming elements for the prediction of exudative sandstone-type Uranium deposits,such as Yaojia Formation and Sifangtai Formation,which are dominated by the red formation,and can provide better guide for the exploration of exudative sandstone type uranium deposits in the Songliao Basin.

关 键 词：烃源岩 富铀有机质建造 九佛堂组 沙海组 青山口组 嫩江组 松辽盆地 

分 类 号：P619.14[天文地球—矿床学]