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藏北革吉北部竟柱山组 地球化学与碎屑锆石U-Pb年代学特征及意义
投稿时间:2019-12-03  修订日期:2019-12-23  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020051
摘要点击次数: 86
全文下载次数: 78
作者单位E-mail
李宝龙 中国地质科学院矿产资源研究所 xinzhongguolong@163.com 
彭勃 中国地质科学院矿产资源研究所  
郭平 中国地质大学地球科学与资源学院  
史仲明 中国地质大学地球科学与资源学院  
秦广洲 成都理工大学地球科学学院
成都理工大学地球科学学院 
 
周磊 四川地矿局化探队  
李宇飞 中国冶金总局内蒙古地质调查院  
基金项目:中国博士后科学基金,国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:沿班公湖-怒江缝合带近东西向不连续分布的上白垩统竟柱山组(K2j),是洋-陆转换后的陆相沉积。因其东西向空间跨度较大,其准确的形成时限和砂岩源区的构造环境存在争议。本文采集西藏革吉县北部竟柱山组粗砂岩,对其碎屑锆石进行LA-ICP-MS U-Pb测年和主微量元素分析。样品碎屑锆石U-Pb谐和年龄值范围集中于100~130Ma和150~170Ma;在碎屑锆石年龄频谱图上,主要出现111.7Ma和160.1Ma两个峰值。最新的碎屑锆石年龄加权平均值为105.3Ma,表明竟柱山组应在早白垩世末期之后沉积。SiO2含量为52.92%~69.47%,Al2O3含量为5.22%~14.34%。高场强元素Ta、Nb、Ti亏损,Hf、Th及REE富集;大离子亲石元素Ba亏损,Rb、K富集。主微量元素特征及判别图解表明,研究区竟柱山组砂岩源区构造背景为大陆岛弧环境,物源为中酸性火成岩。
中文关键词:班公湖-怒江缝合带  竟柱山组  锆石U-Pb年代学  砂岩地球化学  构造背景
 
The geochemistry characteristic, detrital zircon U-Pb geochronology, and its geological significance of Jingzhushan Formation from northern region of Geji County, northern Tibet
Author NameAffiliationE-mail
Li Baolong 1) NLR Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences xinzhongguolong@163.com 
pengbo NLR Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences  
Guoping 2) School of Earth Sciences and ResourcesChina University of Geosciences  
shi zhongming School of Earth Sciences and ResourcesChina University of Geosciences  
Qin Guangzhou College of Earth Sciences, Chengdu University of Technology  
Zhou Lei Geochemistry Exploration Brigade of Sichuan Bureau of Exploration and Development of Geology and Minerals Resources  
Li Yufei Institute of the Inner Mongolia Geologic Exploration, China Metallurgical Geology Bureau  
Abstract:The Jingzhushan Formation of Upper Cretaceous (K2j), which distributed discontinuously along the Bangong Co- Nujiang suture zone, with approximately E- W trend, is a continental deposition after the Ocean- Continent fully completed conversion. Due to its large east-west spatial span, its exact formation time and the tectonic environment of the sandstones’ source area are controversial. We collected the coarse sandstone of the Jingzhushan Formation from northern region of Geji County, Tibet, and analyzed the characteristics of detrital zircon LA-ICP-MS U-Pb age and the main and trace elements of the sandstone. The U-Pb concordia age of sandstones from Jingzhushan Formation is concentrated at 100~130 Ma and 150~170Ma,. The zircon age shows two peaks of 111.7 Ma and 160.1 Ma on the detrital zircon age spectrum map of the Jingzhushan formation sandstone. The latest detrital zircon weighted average age is 105.3 Ma, indicating that the Jingzhushan Formation should be deposited after the early Cretaceous. The content of SiO2 was 52.92%~69.47%,. The content of Al2O3 was 5.22%~14.34%. High field strength elements Ta, Nb and Ti depleted, enrich of Hf, Th and REE; Large ion lithophile elements Ba depleted, enrich of Rb and K. The characteristics of the main and trace elements and the discriminant diagrams show that the tectonic background of the source area of sandstones from Jingzhushan Formation in the study area should be continental island arc, and the original rock of Jingzhushan Formation sandstones is intermediate-acid igneous rock.
keywords:Bangong Co- Nujiang Suture Zone  Jingzhushan Formation  U-Pb geochronology  Geochemical characteristic of sandstones  Tectonic settings
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