扬子西南缘晚三叠世-早侏罗世盆山格局演化过程:来自楚雄盆地碎屑锆石U-Pb年代学的证据  

Evolution of Basin-Range Pattern in Southwest Margin of Yangtze Block during Late Triassic to Early Jurassic:Evidence of Detrital Zircon U-Pb Geochronology from Chuxiong Basin

作　　者：颜照坤 颜晨雨[1] 邵崇建 张自力 叶婷婷 张代柱 任聪 聂舟 赵少泽 龚楚雲 赵文武 Yan Zhaokun;Yan Chenyu;Shao Chongjian;Zhang Zili;Ye Tingting;Zhang Daizhu;Ren Cong;Nie Zhou;Zhao Shaoze;Gong Chuyun;Zhao Wenwu(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;Southwest Oil and Gas Field Company,PetroChina,Chengdu 610041,China)

机构地区：[1]东华理工大学核资源与环境国家重点实验室,江西南昌330013 [2]自然资源部深地动力学重点实验室,中国地质科学院地质研究所,北京100037 [3]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [4]中国石油西南油气田公司,四川成都610041

出　　处：《地球科学》2023年第4期1259-1270,共12页Earth Science

基　　金：国家自然科学基金项目(No.41502116);自然资源部深地动力学重点实验室自主(开放)研究课题(No.J1901);四川省科技计划项目(No.2019YJ0468).

摘　　要：印支期扬子西南缘沉积盆地大地构造性质及盆山格局演化过程长期存在较大分歧.对楚雄盆地西侧祥云剖面上三叠统-下侏罗统砂岩样品进行碎屑锆石U-Pb定年和碎屑物源分析.结果显示,上三叠统云南驿组和罗家大山组碎屑物源主要来自上扬子地区的中-下三叠统和二叠系,而上三叠统白土田组和下侏罗统冯家河组碎屑物源主要来自松潘-甘孜地体和康滇古陆.结合沉积环境演变和区域地质背景,认为在晚三叠世早期,区域内造山作用相对较弱,楚雄盆地碎屑物源供给不足,为欠补偿盆地;晚三叠世晚期-早侏罗世,虽然楚雄盆地的构造演化受哀牢山造山带逆冲推覆作用的控制,但是楚雄盆地的沉积充填过程主要受控于快速崛起的松潘-甘孜造山带.There exist divergent views about the Indosinian tectonic nature of basin and the evolution of basin-range pattern in the southwest margin of the Yangtze block.Detrital zircon U-Pb dating and detrital provenance analysis of sandstone samples from the Upper Triassic-Lower Jurassic of Xiangyun Section in the western Chuxiong basin were carried out.The results show that the detrital sources of the Upper Triassic Yunnanyi Formation and Luojiadashan Formation are mainly from the Middle-Lower Triassic and Permian in the Upper Yangtze region.The detrital sources of the Upper Triassic Baitutian Formation and the Lower Jurassic Fengjiahe Formation are mainly from the Songpan-Ganzi terrane and Kangdian ancient land.Combined with the sedimentary environment evolution and regional geological setting,it is considered that the orogeny is relatively weak during the earlier Late Triassic,and Chuxiong basin is an underfilled basin,whose clastic source supply is insufficient.From the later Late Triassic to Early Jurassic,the tectonic evolution of Chuxiong basin was controlled by the thrust nappe of Ailaoshan orogenic belt,but the sedimentary filling process of Chuxiong basin was mainly controlled by the rapid rise of Songpan-Ganzi orogenic belt.

关 键 词：楚雄盆地 印支期 盆山格局 扬子西南缘 锆石U-PB定年 构造地质学 

分 类 号：P541[天文地球—构造地质学]