古地理学报2017，Vol.19Issue(6)：999-1012,14.DOI:10.7605/gdlxb.2017.06.077
鄂尔多斯盆地北部侏罗系直罗组沉积特征与演化
Sedimentary characteristics and evolution of the Jurassic Zhiluo Formation in northern Ordos Basin
摘要
Abstract
The sandstones in the Lower Member of the Jurassic Zhiluo Formation in northeastern Ordos Basin has been recognized as major reservoirs of uranium in northeastern Ordos Basin.Although previous studies on the sedimentology of the uranium-bearing sandstones in the basin have been usually focused on regional distribution of the uranium-bearing sandstones in northern Ordos Basin received very few attention.Based on large quantities of well data and outcrop measurements in this study,the Lower Member of Zhiluo Formation is divided into two sub-members (J2z1-1,J2z1-2) in northern Ordos Basin.The main types of sedimentary facies identified in the Zhiluo Formation include fluvial facies and deltaic facies.During the deposition of the lower sub-member,the main depositional facies developed include gravelly to sandy braided fluvial deposits and deltaic deposits in the northeastern part of the study area.The main depositional facies gradually changed to sandy braided and meandering fluvial deposits during the deposition of the upper sub-member.Meandering fluvial systems were widely developed during deposition of the upper member,especially toward the top of the member.This study found that the development of uranium ore is mainly controlled by factors such as material composition of the source rock,distribution and evolution of favorable depositional systems,and climate condition.The analysis of facies and the development of the depositional model of the Zhiluo Formation could potentially have important applications for the exploration of uranium deposits in northern Ordos Basin.关键词
沉积相/侏罗系/直罗组/砂岩型铀矿/鄂尔多斯盆地北部Key words
sedimentary facies/Jurassic/Zhiluo Formation/sandstone-hosted uranium deposits/northern Ordos Basin分类
天文与地球科学引用本文复制引用
薛锐,赵俊峰,闫占冬,杨瑶,赵旭东,赵中平..鄂尔多斯盆地北部侏罗系直罗组沉积特征与演化[J].古地理学报,2017,19(6):999-1012,14.基金项目
国家自然科学基金重点项目(编号:41330315)、中国地质调查局地质调查项目(编号:12120114009201)、西北大学大陆动力学国家重点实验室科技部专项经费项目(编号:201210122)联合资助.Co-funded by the State Key Program of National Natural Science Foundation of China(No.41330315),the Geological Survey Project of China Geological Survey(No.12120114009201),and the Ministry of Science and Technology Special Fund Project of State Key Laboratory of Continental Dynamics,Northwest University(No.201210122) （编号:41330315）
