松辽盆地东南缘卡伦湖地区上白垩统泉头组地球化学特征、碎屑锆石年龄与物源分析  

Geochemical Characteristics,Detrital Zircon Age and Provenance Analysis of Upper Cretaceous Quantou Formation in Kalun Lake Area,Southeast Margin of Songliao Basin

作　　者：李彤 俞礽安 王铁军[2] 殷栋法 司庆红 朱强 文思博 涂家润 Li Tong;Yu Reng’an;Wang Tiejun;Yin Dongfa;Si Qinghong;Zhu Qiang;Wen Sibo;Tu Jiarun(Tianjin Geological Survey Center,China Geological Survey,Tianjin 300170,China;Sinosteel Tianjin Geological Research Institute Co.,Ltd.,Tianjin 300181,China;Chinese Academy of Geological Sciences,Beijing 100037,China;Special Technology Exploration Center of China General Administration of Coal Geology,Beijing 100041,China)

机构地区：[1]中国地质调查局天津地质调查中心,天津300170 [2]中钢集团天津地质研究院有限公司,天津300181 [3]中国地质科学院,北京100037 [4]中国煤炭地质总局特种技术勘探中心,北京100041

出　　处：《地球科学》2024年第5期1759-1777,共19页Earth Science

基　　金：中国地质调查局地质调查项目(No.DD20190119);国家重点研发计划“深地资源勘查开采”重点专项项目(No.2018YFC0604200)。

摘　　要：选取吉林长春卡伦湖地区的上白垩统泉头组砂岩,通过X荧光光谱仪、ICP-MS等离子体质谱仪以及锆石LA-ICPMS U-Pb定年等方法进行岩石地球化学及碎屑锆石U-Pb年代学研究,探讨研究区物源以及区域沉积构造背景.结果显示,研究区泉头组源区岩石的主要类型为具有大陆边缘构造背景的火成岩组合;根据研究区主、微量元素和稀土元素特征以及样品锆石的U-Pb年龄,松辽盆地张广才岭地区与研究区所采集样品的地化数据表现出相似性,二者岩石都富集大离子亲石元素以及轻稀土元素,亏损高场强元素和重稀土元素,具有火山弧岩浆岩的地球化学特征等,并且研究区泉头组的碎屑锆石U-Pb年龄分布峰值和比例与前人研究的张广才岭地区的花岗岩锆石U-Pb年龄分布具有极大相似性.结合研究区泉头组砂体展布、沉积体系以及东部隆起区水系展布特征及前人研究结果,综合认为研究区物源来自张广才岭地区,泉头组下段主要沉积作用为填平补齐,充填粗碎屑岩和红色泥岩不整合于阜新组之上,上段以超覆式沉积作用为主,以河流相红色砂泥岩沉积逐渐向盆地中心过渡.对于重塑松辽盆地东南缘构造与物源演化过程、矿产资源分布以及松辽盆地东南缘泉头组砂岩储层评价做出重要贡献,为盆地东南缘潜在铀矿层的预测以及铀矿区铀源的进一步评价等方面提供了重要借鉴.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

关 键 词：碎屑锆石U-PB年龄 泉头组 吉林长春卡伦湖地区 松辽盆地 地质年代学 地球化学 

分 类 号：P597[天文地球—地球化学]