世界核地质科学2025，Vol.42Issue(5)：958-973,16.DOI:10.3969/j.issn.1672-0636.2025.05.005
银额盆地居延海坳陷新近系苦泉沟组地球化学特征及其对铀成矿的指示
Geochemical characteristics of the Neogene Kuquangou formation in the Juyanhai depression of Yingen-Ejin basin and their implications for uranium mineralization
摘要
Abstract
Kuquangou formation is newly identified Neogene stratum in the western part of the Yingen-Ejin basin,mainly consisting of a set of red variegated clastic rocks.Currently,there are relatively few studies and discussions on the characteristics of its sedimentary and diagenetic environment and the related uranium mineralization.Through the analysis of the major and trace elements of the representative borehole core samples of the Kuquangou formation,several important understanding were achieved.The total amount of rare earth elements(∑REE)in the Kuquangou formation ranges from 35.7×10-6 to 184.5×10-6,the REE pattern is generally a right-inclined type enriched in LREE and low HREE content and the internal fractionation.Trace elements are relatively enriched in V,Cr,Cu,and Zn,large ion lithophile elements such as Rb,Sr,Ba show a slight depletion relative to the upper continental crust of China,but obvious Cs and the depletion in some samples.High field strength elements such as Th,Nb,Ta,Zr,Hf,Tm,and Yb show a slight depletion.The sample values of the element ratio w(Sr)/w(Ba),are all less than 1,representing a freshwater sedimentary environment.The values of w(V)/w(V+Ni)are between 0.59 and 0.85,indicating a reducing and anoxic environment,the values of w(Sr)/w(Cu)of the samples are between 5 and 11,indicating a warm and humid climate environment on the whole.On conclusion,the Kuquangou formation in the western part of the Yingen-Ejin basin,was deposited in the climate was relatively warm and humid,and the sedimentary water body was an anoxic and sub-reducing freshwater environment.With the continuous development of the neotectonic movement since the Neogene-Quaternary,the deep oil and gas reservoirs in this area,the Neogene variegated strata in this area was well developed,the Neogene variegated strata may be reduced to form mineralization by the reducing fluid seeping along the faults connecting to the reservoirs.关键词
苦泉沟组/银额盆地/地球化学/铀成矿Key words
Kuquangou formation/Yingen-Ejin basin/geochemistry/uranium mineralization分类
天文与地球科学引用本文复制引用
齐天骄,邢作昌,刘武生,李伟涛,史清平..银额盆地居延海坳陷新近系苦泉沟组地球化学特征及其对铀成矿的指示[J].世界核地质科学,2025,42(5):958-973,16.基金项目
核技术研发项目(编号:地H2401)资助 Supported by Research and development projects on nuclear technology(No.地 H2401) （编号:地H2401）
