平庄盆地北缘铀异常分布特征及铀成矿地质条件分析  

The analysis of distribution characteristics of uranium anomalies and geological conditions of uranium mineralization in the northern margin of Pingzhuang Basin

作　　者：吕东霖 董方升 王生文 张松 杨成峰 彭虎 马小东 LU Donglin;DONG Fangsheng;WANG Shengwen;ZHANG Song;YANG Chengfeng;PENG Hu;MA Xiaodong(Liaoning Province Geology and Minerals Group Energy Geology Co.,Ltd.,Shenyang 110013,Liaoning,China;China University of Geosciences(Wuhan),Wuhan 430074,Hubei,China)

机构地区：[1]辽宁省地矿集团能源地质有限责任公司,辽宁沈阳110013 [2]中国地质大学(武汉),湖北武汉430074

出　　处：《矿产勘查》2023年第5期766-775,共10页Mineral Exploration

基　　金：辽宁省地质勘查项目“辽西北地浸砂岩型铀矿成矿地质条件研究(JH20-210000-05760)”资助。

摘　　要：平庄盆地位于松辽盆地西南部,前人在盆地内进行煤田及放射性勘查时发现了大量的铀异常线索,但对铀异常特征及成矿地质条件研究尚不深入。本文基于大量钻孔资料,以六家和黑水地区为重点通过分析钻孔综合柱状图、自然伽马测井曲线和测试数据,对平庄盆地北缘铀异常分布特征及铀成矿地质条件进行深入研究。研究发现平庄盆地北缘铀异常发育广泛,六家和黑水地区异常厚度较大,稳定性较好。铀异常发育层位为白垩系阜新组上段、孙家湾组下段以及孙家湾组上段,赋矿岩性为灰黑色泥岩、细砂岩及灰色中粗砂岩和砂砾岩。通过统计各钻孔含铀矿目的层地层厚度、砂体厚度、铀异常厚度等数据,绘制铀储层与铀异常叠合图等分析图件,发现平庄盆地北缘砂岩型铀矿床成矿地质条件较好,其中铀源条件、铀储层条件、氧化作用条件及还原介质条件均有利于铀矿化作用的发生。研究区下一步找矿方向为六家地区北部和黑水地区东北部。Pingzhuang Basin is located in the southwestern part of the Songliao Basin,previous researchers discovered a large number of uranium anomaly clues during coal field and radioactive exploration within the basin,but the study of uranium anomaly characteristics and mineralization geological conditions is not yet in-depth.This paper is based on a large amount of drilling data,with a focus on the Liujia and Heishui areas.By analyzing the comprehensive borehole bar chart,natural gamma logging curve,and test data,the distribution characteristics of uranium anomalies and geological conditions of uranium mineralization in the northern edge of the Pingzhuang Basin are thoroughly studied.Research has found that uranium anomalies are widely developed in the northern edge of the Pingzhuang Basin,with larger thickness and better stability in the Liujia and Heishui areas.The abnormal development of uranium is located in the upper section of the Fuxin Formation,the lower section of the Sunjiawan Formation,and the upper section of the Sunjiawan Formation of the Cretaceous System.The ore-forming lithology is gray black mudstone,fine sandstone,gray medium coarse sandstone,and sandy conglomerate.By collecting data on the thickness of target layers,sand bodies,and uranium anomalies in each borehole,and drawing analysis maps of uranium reservoirs and uranium anomalies,it was found that the geological conditions for uranium mineralization in the sandstone type uranium deposits on the northern edge of the Pingzhuang Basin are good,with uranium source conditions,uranium reservoir conditions,oxidation conditions,and reduction medium conditions all favorable for the occurrence of uranium mineralization.The next exploration direction in the research area is the northern part of Liujia area and the northeastern part of Heishui area.

关 键 词：铀异常 分布特征 成矿地质条件 六家和黑水地区 平庄盆地北缘 

分 类 号：P612[天文地球—矿床学]