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上扬子西南待补地区下三叠统飞仙关组锆石年代学、岩石地球化学及其地质意义
投稿时间:2020-04-30  修订日期:2020-06-02  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2021067
摘要点击次数: 111
全文下载次数: 138
作者单位地址
缪 宇 中国地质调查局昆明自然资源综合调查中心 云南省昆明市西山区春雨路1566号
田瑜峰 中国地质调查局昆明自然资源综合调查中心 
吴 亮 中国地质调查局昆明自然资源综合调查中心 
吕晓春 中国地质调查局成都自然资源综合调查中心 
李仕忠 中国地质调查局昆明自然资源综合调查中心 
宋文婷 云南工商学院 
基金项目:中国地质调查局西南沿边及特殊地区地质矿产调查《云南待补(G48E011006)、务德(G48E011007)、李子沟 (G48E012006)、得德卡(G48E012007)幅1:5万区域地质矿产调查》项目(编号:12120115041601)
中文摘要:晚二叠世以来受印支造山运动及峨眉山玄武岩喷发事件的影响,上扬子西南缘地区沉积物源及沉积模式发生了重大改变,引发学术界热议。本文以上扬子西南待补地区下三叠统飞仙关组碎屑岩为例,从岩相学、岩石地球化学和碎屑锆石U-Pb年代学等方面对飞仙关组源岩属性、物源、沉积及构造环境进行约束。飞仙关组碎屑岩整体成熟度较低,岩石风化程度中等,源区曾经历过持续的构造抬升剥蚀,并于早三叠世扬子西南缘浅海-滨海相的氧化环境中沉积。其碎屑锆石U-Pb年龄主要集中在257±2.9Ma,与晚二叠世峨眉山玄武岩主喷发时限一致,岩石地球化学特征表现出与峨眉山高钛玄武岩的高度一致特性,指示飞仙关组主要物源区为近源的峨眉山大火成岩省,源岩主要为板内拉张环境形成的峨眉山高钛玄武岩,并在玄武质岩浆上涌过程中混染了少量扬子陆块古老结晶基底成分。此外,康滇古陆及扬子克拉通也提供了部分物源,主要为Rodinia超大陆汇聚及裂解背景下产生的岩浆岩。年代学证据显示,Rodinia超大陆汇聚及裂解事件在区内具有较好的沉积物源响应,为全球性Rodinia超大陆汇聚及裂解事件的时限约束提供了重要参考依据。
中文关键词:上扬子西南缘  飞仙关组  岩石地球化学  碎屑锆石  物源  构造环境
 
Zircon U-Pb chronology、petrochemistry and its geological significance of the Lower Triassic Feixianguan Formation in the Daibu area,Southwest of Upper Yangtze
Author NameAffiliationAddress
Miao Yu Kunming Natural Resources Comprehensive Investigation Center, China Geological Survey, Kunming 650001, Yunnan, China
 
云南省昆明市西山区春雨路1566号
Tian Yufeng Kunming Natural Resources Comprehensive Investigation Center, China Geological Survey, Kunming 650001, Yunnan, China
 
Wu Liang Kunming Natural Resources Comprehensive Investigation Center, China Geological Survey, Kunming 650001, Yunnan, China
 
Lü Xiaochun Chengdu Natural Resources Comprehensive Investigation Center, China Geological Survey, Cheng du 610000, Sichuan, China
 
Li Shizhong Kunming Natural Resources Comprehensive Investigation Center, China Geological Survey, Kunming 650001, Yunnan, China
 
Song Wenting Technology and Business University, Kunming 650001, Yunnan, China 
Abstract:Since the late Permian, influenced by the Indosinian orogeny and Emeishan basalt eruption, the sediment sources and sediment patterns have changed significantly in the southwest margin of the upper Yangtze, which aroused heated discussion in academia. Therefore, in this paper, taking the detrital rocks from the Lower Triassic Feixianguan Formation in the Daibu area of Southwest Upper Yangtze as an example, constrains the source rock properties、material provenance, sedimentation and tectonic environment background by the aspects of petrography、petrogeochemical and Zircon U-Pb chronology. The maturity of the detrital rocks from the Feixianguan Formation is low, and the weathering degree of the rocks is medium, the source region has experienced continuous tectonic uplift and denudation, and deposited in the oxidative sedimentary environment of the shallow-littoral facies in the southwestern margin of the Yangtze in the Early Triassic. The U-Pb age of zircon in this paper is mainly concentrated at 257 ± 2.9ma, which is consistent with the main eruption time of Emeishan basalt in Late Permian, the petrogeochemical characteristics of the detrital rocks are highly consistentd with the Emeishan high-Ti basalt, indicating that the main source area of the Feixianguan Formation is the near-source Emeishan igneous province, the source rock is mainly the Emeishan high-Ti basalt which formed in an intraplate extensional environment, and during the basaltic magma upwelling a small amount of ancient crystalline basement components of the Yangtze block mixed in. Furtherly, the Kangdian ancient land and the Yangtze craton also provided part of the sediment sources, mainly the magmatic rocks which formed under the background of Rodinia supercontinent convergence and breakup. Chronological evidence shows that the Rodinia supercontinent convergence and breakup events have a good response to the sediment sources in the study area, which provides an important reference basis for the time constraints of global Rodinia supercontinent convergence and breakup events.
keywords:Southwest margin of upper Yangtze  Feixianguan Formation  petrogeochemical  detrital zircons  material provenance  tectonic environment
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