世界核地质科学2025，Vol.42Issue(1)：45-59,15.DOI:10.3969/j.issn.1672-0636.2025.01.004
准噶尔盆地南缘楼庄子地区头屯河组下段赋铀砂岩地球化学特征及地质意义
Geochemical characteristics and geological significance of uranium-bearing sandstone in the lower member of Toutunhe formation in Louzhuangzi area,southern margin of Junggar basin
摘要
Abstract
This article analyzes the petrological characteristics,geochemical features,provenance composition,structural background,and sedimentary environment of uranium bearing sandstone in the lower member of the Toutunhe formation in the Louzhuangzi area by the methods of geochemical analysis,microscopic identification and core observation,and preliminarily explores their relationship with uranium mineralization.The results show that the tectonic background of the ore-bearing sandstone source rocks in the lower member of the Toutunhe formation is mainly the active continental margin and the passive continental margin.The special tectonic background provided favorable conditions for the migration of uranium.The source of sandstone debris was dominated by neutral igneous rock,and the parent rock was mainly calc-alkaline granite with a small amount of pyroclastic rock,sedimentary rock and metamorphic rock,which indicated the sandstone from multi-source nature,and has a good uranium source.The sandstone formed in a warm and humid paleoclimate and the source rock was strongly weathered.The sandstone is rich in reducing medium,reflecting that the lower member of Toutunhe formation was in a reducing environment and has good primary reduction ability.The content of major elements of the sandstone debris in the target layer has the characteristics of rich alkali,high silicon and weak aluminum,and the ore-bearing sandstone are of lower w(SiO2)and w(Al2O3)and higher w(CaO)than those of the sterile sandstone.The difference of component content in the sand body of the ore-bearing member is characterized by strong clay alteration and carbonate development.U,Mo and Se are relatively enriched,and other trace elements are relatively depleted except for Ga,which is comparable to the sedimentary rocks in China.The content of trace elements in ore-bearing samples of the same borehole is generally higher than that in sterile samples,U,Mo,Se,V,Ge,Ti,Sc and Y are significantly increased,which indicated that the trace elements in the sand body of the target layer also have migrated and enriched in the uranium mineralization process.关键词
楼庄子/头屯河组下段/赋铀砂岩/岩石地球化学Key words
Louzhuangzi/lower member of Toutunhe formation/uranium-bearing sandstone/lithogeochemistry分类
地质学引用本文复制引用
郭超,贾为卫,黄松,王国荣,廉刚..准噶尔盆地南缘楼庄子地区头屯河组下段赋铀砂岩地球化学特征及地质意义[J].世界核地质科学,2025,42(1):45-59,15.基金项目
中国核工业地质局铀矿调查评价项目"新疆准噶尔盆地南缘金沟河-浅水河地区铀矿资源调查评价(编号:202107-2)"资助 Supported by uranium investigation and evaluation project of China Nuclear Geology"Investigation and Evaluation of Uranium Resources in Jingouhe to Qianshuihe Area in the Southern Margin of the Junggar Basin,Xinjiang(No:202107-2)". （编号:202107-2）
