摘要
松辽盆地构造演化划分为前中生代克拉通基底演化、晚侏罗世挤压火山穹窿演化、早白垩世伸展断陷、晚白垩世早期热冷却坳陷、晚白垩世晚期反转褶皱隆升萎缩剥蚀、古近纪伸展断陷隆升剥蚀及新近纪—第四纪挤压坳陷等7个演化阶段。本文系统讨论了松辽盆地北部构造演化与铀成矿作用的关系,指出晚白垩世早期冷却坳陷、晚白垩世晚期反转褶皱隆升萎缩剥蚀、古近纪伸展断陷隆升剥蚀3个阶段为区内主要铀成矿阶段。铀矿化的分布受基底断裂及反转构造带联合控制。松辽盆地北部构造演化对各构造分区铀矿床成矿类型具有明显的控制作用:西部斜坡区以寻找"古层间氧化"型、层间氧化型砂岩型铀矿床为主要类型;中央坳陷区及东北隆起区应围绕大庆长垣、绥棱背斜带等构造剥蚀天窗寻找"钱家店"式砂岩型铀矿床;北部倾没区及东北隆起区盆缘以寻找层间氧化型砂岩型铀矿床为主要类型。
The structural evolution of Songliao basin can be divided into seven evolution stages: The pre Mesozoic craton basement evolution, the Late Jurassic compressional volcanic dome evolution, the Early Cretaceous extensional fault depression, the early stage of Upper Cretaceous cooling depression, the late stage of Upper Cretaceous reverse fold uplift and atrophy, the uplift and denudation of Paleogene extensional fault, and the Neogene Quaternary compression depression.The relationship between the structural evolutions and the uranium mineralization in the North of Songliao basin was studied systematically. The results show that the main stages of uranium mineralization are in the early stage of Upper Cretaceous cooling depression, late stage of Upper Cretaceous reverse fold uplift and atrophy, uplift, and denudation, and Paleogene extensional fault depression uplifting and denuding. The distribution of uranium mineralization is jointly controlled by the basement fracture and the reverse tectonic zone.The uranium metallogenic types of each tectonic division are controlled by the structural evolutions: The "paleo-interlayer oxidation" and interlayer oxidation sandstone type uranium deposit are the main types in the western slope area.The type of "Qianjiadian sandstone type uranium deposit" should be searched in the structural denudation skylight of Changqi Placantieline and Suileng anticline belt of central depression and northeastern uplift area;While the interlayer oxidation type sandstone type uranium deposit is the main type in the northern tilted area and the basin margins of the northeastern uplift area.
作者
席海银
范月野
王广婷
张杨
Xi Haiyin;Fan Yueye;Wang Guangting;Zhang Yang(Hunan Mining and Metallurgy Bureau of Nuclear Industry,Changsha 410016,China;Research Institute No.240,CNNC,Shenyang 110032,China)
出处
《吉林大学学报（地球科学版）》
CAS
CSCD
北大核心
2021年第4期1030-1041,共12页
Journal of Jilin University：Earth Science Edition
基金
中国核工业地质局铀矿地质勘查项目(202024)。
关键词
松辽盆地北部
构造演化
基底断裂
构造反转
砂岩型铀矿床
Northern Songliao basin
tectonic evolution
basement fracture
structural inversion
sandstone type uranium deposit
