Geochemical Characteristics,Detrital Zircon Age and Provenance Analysis of Upper Cretaceous Quantou Formation in Kalun Lake Area,Southeast Margin of Songliao Basin
In this paper,the sandstone of Upper Cretaceous Quantou Formation in Kalun Lake area,Changchun,Jilin Province is selected to study the rock geochemistry and detrital zircon U-Pb chronology by means of X-fluorescence spectrometer,ICPMS plasma mass spectrometer and zircon La-ICP-MS U-Pb dating,so as to explore the provenance and regional sedimentary tectonic background of the study area.The results show that the main types of rocks in the source area of Quantou Formation in the study area are igneous rock assemblages with continental margin tectonic background;According to the characteristics of major elements,trace elements and rare earth elements in the study area and the U-Pb age of zircon samples,the geochemical data of samples collected in Zhangguangcailing area of Songliao basin and the study area show similarity.Both rocks are rich in large ion lithophile elements and light rare earth elements,and depleted in high field strength elements and heavy rare earth elements,showing the geochemical characteristics of volcanic arc magmatic rocks.The peak value and proportion of detrital zircon U-Pb age distribution of Quantou Formation in the study area are very similar to that of granite zircon U-Pb age distribution in zhangguangcailing area.Combined with the sand body distribution,sedimentary system and water system distribution characteristics of the eastern uplift area in the study area and the previous research results,it is comprehensively considered that the material source in the study area comes from Zhangguangcailing area.The main sedimentation of the lower section of Quantou Formation is leveling and filling,and the filled coarse clastic rock and red mudstone are not integrated on Fuxin Formation,and the upper section is dominated by overlapping sedimentation.The red sandstone and mudstone deposits of fluvial facies show gradual transition to the center of the basin.This paper makes an important contribution to reshaping the structure and provenance evolution process,mineral resource distribution and sandstone reservoir evaluation of Quantou Formation in the southeast edge of Songliao basin,and provides an important reference for the prediction of potential uranium deposits in the southeast edge of Songliao basin and the further evaluation of uranium sources in uranium mining areas.
detrital zircon U-Pb ageQuantou FormationKalun Lake area,Changchun,Jilin ProvinceSongliao basingeochronologygeochemistry
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