松辽盆地中-新生代构造-沉积演化及其对铀成矿地控制作用  

Structural-sedimentary Evolution of Mesozoic-Cenozoic and Its Control on Uranium Mineralization in Songliao Basin

作　　者：贾立城[1] 李真真 黄笑 邢作昌 田明明[1] JIA Licheng;LI Zhenzhen;HUANG Xiao;XING Zuochang;TIAN Mingming(CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology,Beijing Research Institute of Uranium Geology,Beijing 100029,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]核工业二四三大队,内蒙古赤峰024000

出　　处：《铀矿地质》2024年第1期90-104,共15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：松辽盆地为大型断-坳复合型沉积盆地,复杂的盆地演化和充填作用形成了盆地有利的铀成矿地质背景和成矿条件,控制了盆地大规模铀成矿作用,开展盆地构造-充填特征研究是深化盆地铀成矿机理研究的基础性工作。文章通过对松辽盆地构造-充填特征研究,总结了成盆动力学机制,初步恢复了原形盆地形态与特征,查明盆地构造-沉积演化特征与盖层建造类型。研究表明,松辽盆地主要经历早白垩世裂谷(断陷)与晚白垩世坳陷两个主要成盆阶段,形成下断上坳的充填结构,在垂向上发育三套上红下黑的成矿建造组合。将盆地中-新生代演化划分为6个阶段,其中古新统—始新统(E1—E2),盆地在挤压背景下发育全区隆升剥蚀,深部成矿流体大规模渗出改造成矿,是盆地的主成矿期。Songliao Basin is a large fault-depression composite sedimentary basin.The composite evolution and filling produced the favorable geological background and metallogenic conditions for uranium mineralization.The structurefilling characteristics of the basin was studied to deepen the understanding of uranium metallogenic mechanism.Based on the study of the structure-filling characteristics of Songliao Basin,this paper summarized the basin-forming dynamics,preliminarily recovered the shapes and features of prototype basin,and identified the structural-sedimentary evolution characteristics and cover types.The study result showed that the basin mainly experienced two stages of basin formation,the Early Cretaceous rift(fault-depression)and the Late Cretaceous depression,resulted in the formation of filling structure of the lower fault and the upper depression,and three sets of favorable formations of upper red and lower black vertically.The Meso-Cenozoic evolution of the basin can be divided into six stages,in which the Paleocene-Eocene(E1-E2)basin developed uplift and denudation under the background of compression,and the deep ore-forming fluid was exuded and reworked on the mineralization with large scale and compromised the main ore-forming period of the basin.

关 键 词：松辽盆地 构造演化 沉积建造 砂岩型铀矿 

分 类 号：P619.14[天文地球—矿床学]