海拉尔盆地克鲁伦凹陷中-新生代构造演化及其对铀成矿的控制作用  

Cenozoic Tectonic Evolution and Its Influence on Uranium Mineralization in Kelulun Depression,Hailar Basin

作　　者：王长虹 周文博[1] 崔雅男 张荣 赵曙光 万宏峰 WANG Changhong;ZHOU Wenbo;CUI Yanan;ZHANG Rong;ZHAO Shuguang;WAN Hongfeng(Geologic Party No.243,CNNC,Chifeng,Inner Mongolia 024000,China)

机构地区：[1]核工业二四三大队,内蒙古赤峰024000

出　　处：《铀矿地质》2024年第5期921-930,共10页Uranium Geology

基　　金：内蒙古呼伦贝尔市海拉尔地区铀矿资源调查评价项目(编号:202102);海拉尔盆地克鲁伦凹陷关键控矿要素研究及远景预测项目(编号:202210-3)联合资助。

摘　　要：海拉尔盆地是我国基础能源勘探开发的重要盆地之一,富含煤、石油、天然气等多种能源矿产。文章通过构造演化分析,将海拉尔盆地西部的克鲁伦凹陷中-新生代构造演化分为裂陷阶段、断陷阶段、断坳转换阶段和萎缩阶段4个阶段,并梳理了不同演化阶段的构造特征;以成矿系统的角度,从“源—运—储—变—保”出发系统地分析了不同构造演化阶段对铀成矿的控制作用,并认为南屯组及伊敏组沉积末期的构造挤压活动,有利于凹陷西侧阿敦楚鲁花岗岩体进一步剥出地表,并为凹陷提供铀源;同时构造演化控制了凹陷扇三角洲沉积体系的发育和展布,进而控制了含矿沉积建造的发育。根据构造演化特征推断,自伊敏组沉积后,凹陷与蚀源区一直保持水力联系,在地下水的长期的渗入作用下铀成矿作用一直持续进行。Kelulun depression are believed to be a new resource area for coal,oil and gas.However,low level of exploration and research on basic theories and key ore control elements of uranium,no breakthroughs were gotten in uranium exploration.This article systematically analyzed structural evolution and the control effect on uranium mineralization.With the view of mineralization system,the process of"source-transport-storage-transformationpreservation"was studied,and it was believed that the tectonic compression activity at the end of Nantun Formation and Yimin Formation is conducive to the uplift and erosion of Adunchulu pluton which provided uranium sources for the depression.At the same time,the tectonic evolution controls the distribution of the depression fan delta.It can be inferred that Yimin Formation has been originated to the uranium provenance area since its sedimentation,and result in the uranium mineralization process till present.

关 键 词：构造演化 铀成矿 新生代 克鲁伦凹陷 海拉尔盆地 

分 类 号：P619.14[天文地球—矿床学]