世界核地质科学2024，Vol.41Issue(6)：1076-1088,13.DOI:10.3969/j.issn.1672-0636.2024.06.002
柴达木盆地东北缘德令哈地区砂岩型铀矿化特征及找矿方向
Sandstone-hosted uranium mineralization characteristics and prospecting direction in Delingha area,northeast margin of Qaidam basin
摘要
Abstract
Located in the northeastern margin of the Qaidam basin,Delingha area has been surveyed for quite a long time,but no breakthrough was gotten in the exploration of sandstone-hosted uranium deposits.Based on detailed field geological surveys and indoor analysis,the newly discovered uranium prospects of Deke,Dedong,and Wanggaxiu was reviewed and carefully studied.The research reveals that the main host layer for sandstone type uranium deposit in the Delingha area are the Lower Youshashan formation(N1y),Upper Youshashan formation(N2y)and Shizigou formation(N2s)of the Middle Miocene.The uranium-bearing rocks primarily consist of brownish-red,yellow,brownish-yellow,yellow-green medium-to-coarse grained sandstone,as well as gray-green calcareous fine-grained sandstone.The ores also contain a large amount of organic matter,often presenting in the combination of the"organic matter+pyrite+uranium mineral".Field geological survey revealed that,sandstone-hosted uranium mineralization in the study area is closely related to fault structures,mainly occurred near the wing of the anticline structure and also developed in some faults.Data from the petroleum sector indicated the presence of a～200 m thick set of uranium-rich dark mudstones of the Carboniferous Keluke formation(C2h)in Delingha,with uranium contents over(30～50)×10-6,which can serve as a deep uranium source for the later deposited ore-bearing formations.The structural combination of"anticline+fault"in the study area forms a favorable tectonic decompression zone,providing a conducive pathway for the upward migration of deep uranium-rich ore-forming fluids.Based on this analysis,the exploration for sandstone type uranium deposits in the northeastern margin of the Qaidam basin,especially in Delingha,should primarily focus on"exudative"sandstone-type uranium deposits.The target horizons should mainly include the Lower Youshashan formation,Upper Youshashan formation,and Shizigou formation of the Miocene,special attention should paid to the overlapping areas of"anticlines+faults".关键词
渗出铀成矿作用/砂岩型铀矿/德令哈地区/柴达木盆地Key words
exudative uranium metallogeny/sandstone-hosted uranium deposit/Delingha area/Qaidam basin分类
天文与地球科学引用本文复制引用
田明明,王杰,张希梁,李子颖,蔡煜琦,贺锋,周保军,李西得,赵兴齐,李孟华,钟灵..柴达木盆地东北缘德令哈地区砂岩型铀矿化特征及找矿方向[J].世界核地质科学,2024,41(6):1076-1088,13.基金项目
核技术研发项目"柴达木盆地砂岩型铀矿资源高效预测技术及应用研究(编号:地H2301-1)"和中国核工业地质局铀矿调查评价项目"柴达木盆地中部断隆带铀成矿环境调查与远景评价(编号:202419-5)"联合资助 Supported by Nuclear Technology R&D program"Study on efficient prediction technology and application of sandstone-type uranium resources in Qaidam basin(No.地H2301-1)".uranium investigation and evaluation project of China Nuclear Geology"Investigation and prospective evaluation of uranium metallogenic environment in the central fault-uplift of the Qaidam basin(No.202419-5)". （编号:地H2301-1）
