摘要
层间氧化带精细结构的量化表征对揭示砂岩型铀成矿规律至关重要.利用系列沉积学和地球化学编图对松辽盆地钱家店铀矿床层间氧化带结构进行了量化表征,发现该矿床层间氧化带主要由红色砂岩、浅黄色砂岩、灰白色砂岩、灰色含矿砂岩和原生灰色砂岩构成,分别对应于强氧化亚带、弱氧化亚带、微弱氧化亚带、过渡带和还原带.铀矿化与层间氧化带内部结构关系密切:工业铀矿体主要发育在过渡带,微弱氧化亚带矿体连续性相对较差,弱氧化亚带发育零星铀矿化,还原带靠近过渡带一侧发育低品位的零星铀矿化.铀储层内部结构和沉积相对层间氧化带发育具有重要制约作用:辫状河砂体及辫状分流河道砂体是氧化带发育区域;辫状分流河道边部及分流间湾中决口扇砂体是过渡带发育区域.
Quantitative characterization of architecture of the interlayer oxidation zone is very important to reveal the regularity of uranium mineralization. In this study, the interlayer oxidation zone of the Qianjiadian uranium deposits in the Songliao basin was quantitatively characterized by sedimentological and geochemistry mappings. It is found that the interlayer oxidation zone of the deposit is mainly composed of red sandstone, light yellow sandstone, gray white sandstone, gray mineralized sandstone and primary gray sandstone, respectively corresponding to strong oxidised subzone, weak oxidised subzone, faint oxidised subzone,transitional zone and reduction zone. The uranium mineralization is closely related to the internal architecture of interlayer oxidation zone. The main industrial uranium ore bodies are strictly developed in the transitional zone. A few ore bodies whose continuity is poor occur in the faint oxidised subzone. The ore bodies are sporadically distributed in the weak oxidation subzone. The low-grade uranium ore bodies are found in the side of reduction zone close to transitional zone. Formation of the interlayer oxidation zone is restricted by the heterogeneity of uranium reservoir sandstones and depositional systems. The oxidised zone is mainly developed in sand bodies of the braided river and braided distributary channel, and the transition zone primarily distributed at the edge of the braided distributary channel or in the crevasse fan.
作者
曹民强
荣辉
陈振岩
焦养泉
里宏亮
王岩
李青春
Cao Minqiang;Rong Hui;Chen Zhenyan;Jiao Yangquan;Li Hongliang;Wang Yan;Li Qingchun(Development Company of New Energy Sources of Liaohe Petroleum Exploration Bureau,Panjin 124010,China;Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education,China University of Geosciences,Wuhan 430074,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2021年第10期3453-3466,共14页
Earth Science
基金
国家重点研发计划项目(Nos.2018YFC0604200,2018YFC0604202,2018YFC0604205)
国家青年科学基金项目(No.41502105)
中国地质大学(武汉)学科杰出人才基金项目(No.102-162301192664)。
关键词
层间氧化带
砂岩型铀矿
钱家店铀矿床
松辽盆地
铀储层
沉积学
interlayer oxidation zone
sandstone-type uranium deposit
Qianjiadian uranium deposit
Songliao basin
uranium reservoir
sedimentology
