摘要
中侏罗世为直罗组下段沉积期,辫状河道为有利的铀储层砂体,铀矿(化)体主要赋存于辫状河砂体中,受沉积古地貌控制,主要发育在低洼区。晚侏罗世、早白垩世-古新世、始新世-中新世是砂岩型铀成矿期,古地貌控制了地下古水流的流向,控制着氧化还原带的分布和铀矿的富集:晚侏罗世铀预成矿期,古隆起区受到潜水淋滤,含铀物质向斜坡和低洼区迁移;早白垩世-古新世铀主成矿期,古地貌控制了含氧含铀水的水流方向,氧化还原带主要分布在古地貌斜坡区。
During Middle Jurassic period,i.e.,the sedimentary period of Lower Zhiluo Formation,the braided channel was a favorable sand body of uranium reservoir that hosted uranium,and uranium was mainly controlled by palaeogeomorphology and mainly developed in low-lying areas.The Late Jurassic,Early Cretaceous-Paleocene and Eocene-Miocene were main uranium mineralization stages.Palaeogeomorphology controlled the migration of underground water,the distribution of the redox zone and the enrichment of uranium deposits.During the Late Jurassic uranium pre-mineralization period,diving leaching caused the migration of uranium-bearing materials from the uplift to the slope and low-lying areas;during the main uranium mineralization period of Early Cretaceous-Paleocene,palaeogeomorphology controlled the direction of the water flow with oxygen and uranium,and the redox zone was distributed mainly in the slope area of the ancient landform.
作者
贺锋
张字龙
刘红旭
李平
李亚锋
殷龙飞
HE Feng;ZHANG Zilong;LIU Hongxu;LI Ping;LI Yafeng;YIN Longfei(Beijing Research Institute of Uranium Geology, Beijing 100029, China;CNNC Key Laboratory of Uranium Resource Exploration and Evaluation Technology, Beijing 100029, China;No. 203 Research Institute of Nuclear Industry, Xianyang 712000, Shaanxi, China)
出处
《地质通报》
CAS
CSCD
北大核心
2017年第4期527-533,共7页
Geological Bulletin of China
基金
中核集团青年科技创新团队项目<鄂尔多斯盆地东南缘油气耗散与铀成矿的时间配置关系研究>(编号:地HQX1601)
中核集团集中研发项目<鄂尔多斯盆地南部砂岩型铀矿关键因素识别与靶区优选>(编号:2016地LTD1601-3)
中国核工业地质局项目<鄂尔多斯盆地南缘铀成矿地质特征与远景评价>(编号:201586)
国家973项目<北方典型产铀盆地成矿机理与成矿模式>(编号:2015CB453004)
关键词
古地貌特征
沉积期
成矿期
铀成矿
palaeogeomorphology
sedimentary period
mineralization period
uranium mineralization
