鄂尔多斯盆地北部下白垩统环河组铀成矿地质特征及成矿机理研究
Geological characteristics and metallogenic mechanism of Lower Cretaceous uranium mineralization in northern Ordos basin
摘要
Abstract
The Ordos basin is the second largest energy basins in China,and several large uranium ore deposits have been discovered.The upper member of Lower Cretaceous Huanhe formation in the basin is the main prospecting horizon.In this paper,the uranium mineralization characteristics and metallogenic mechanism of Lower Cretaceous Huanhe formation in northern Ordos basin are studied by means of geological characteristics,altered mineral association,rock geochemistry and the metallogenic model is established.The three superimposed system domains of Lower Cretaceous Huanhe formation formed a fine-coarse-fine stratigraphic structure,which provided a foundation for the migration of uranium ore-forming fluids in the later period.In the early stage of mineralization,the scale of the oxidation zone was limited,and the main alteration minerals were hematite,limonite,pyrite,chalcopyrite,sphalerite,calcite and coffinite,etc.The metallogenic environment were of strong reducing capacity,the ore-forming fluid were strongly alkaline,and intense water-rock interaction occured.In the middle and late stage of mineralization,the oxidation zone advanced into the basin,a strong REDOX reaction developed,the primary ore zone and reduction zone were formed,and the metallogenic environment maintained the early strong reducibility.The main altered minerals in this period were hematite,limonite,pyrite,montmorillonite,chlorite and uranite.With the mixing of ore-forming fluids,ore-forming fluids gradually turn to weak alkaline,uranyl silicate ions decomposed,and a large amount of uranite was formed.关键词
下白垩统环河组/蚀变矿物组合/成矿流体/成矿模式/鄂尔多斯盆地北部Key words
Lower Cretaceous Huanhe formation/altered mineral association/ore-forming fluid/ore-forming model/northern Ordos basin分类
地质学引用本文复制引用
王果,刘波,白一鸣,王龙辉,李华明,芦帅帅..鄂尔多斯盆地北部下白垩统环河组铀成矿地质特征及成矿机理研究[J].世界核地质科学,2025,42(3):485-503,19.基金项目
中国核工业地质局项目"鄂尔多斯盆地北部鄂托克前旗-东胜地区铀矿资源调查评价与勘查"(编号:202201)、内蒙古自治区"草原英才"项目"鄂尔多斯盆地北部铀资源成矿理论创新和铀矿大基地资源保障能力提升"和中国工程科技发展战略内蒙古研究院项目"内蒙古铀矿大基地资源保障能力研究"(编号:2024NMYB-07)联合资助 Supported by China Nuclear Geology Bureau Project"Investigation,Evaluation and Exploration of Uranium Resources in EtuoKe QianQi-Dongsheng Area,Northern Ordos Basin"(No.202201) （编号:202201）
the Inner Mongolia Autonomous Region"Grassland Talents"project"Uranium resource mineralization theory innovation in the north of Ordos basin and the improvement of resource support capacity of large uranium mine base" （）
the Inner Mongolia Research Institute of Engineering Science and Technology Development Strategy project"Inner Mongolia Uranium Mine Resource Support Capacity"(No.2024NMYB-07) （No.2024NMYB-07）
