ISSN 1009-6248CN 61-1149/P 双月刊

主管单位:中国地质调查局

主办单位:中国地质调查局西安地质调查中心
中国地质学会

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    老挝仙诺晚三叠世火山岩年代学及地质意义

    曾昭光, 杨恩林, 梁国军, 张贵发, 王华斌

    曾昭光, 杨恩林, 梁国军, 等. 老挝仙诺晚三叠世火山岩年代学及地质意义[J]. 西北地质, 2018, 51(3): 16-25.
    引用本文: 曾昭光, 杨恩林, 梁国军, 等. 老挝仙诺晚三叠世火山岩年代学及地质意义[J]. 西北地质, 2018, 51(3): 16-25.
    ZENG Zhaoguang, YANG Enlin, LIANG Guojun, et al. Geochronology and Geological Significance of Late Triassic Volcanic Rocks in B.Xiang-Nou Area, North Laos[J]. Northwestern Geology, 2018, 51(3): 16-25.
    Citation: ZENG Zhaoguang, YANG Enlin, LIANG Guojun, et al. Geochronology and Geological Significance of Late Triassic Volcanic Rocks in B.Xiang-Nou Area, North Laos[J]. Northwestern Geology, 2018, 51(3): 16-25.

    老挝仙诺晚三叠世火山岩年代学及地质意义

    基金项目: 

    中国地质调查局“老挝沙耶武里及邻区优势矿产资源潜力调查与分析”(12120114018701)

    详细信息
      作者简介:

      曾昭光(1964-),男,贵州余庆县人,工程技术应用研究员,现主要从事地质矿产勘查、区调、矿调及管理工作。E-mail:619205637@qq.com

    • 中图分类号: P588.14

    Geochronology and Geological Significance of Late Triassic Volcanic Rocks in B.Xiang-Nou Area, North Laos

    • 摘要: 老挝北部仙诺地区大地构造位置为难河-程逸-沙缴缝合带西侧的景洪-素可泰火山弧带,在该区中三叠世晚期南团组底部发现有一套火山岩组合,通过1:200剖面测量,在凝灰岩中采集样品进行主量元素、微量元素、稀土元素分析,以及锆石U-Pb定年。SiO2含量为56.13%~74.58%,Al2O3含量为13.9%~25.38%,MgO含量为0.43%~0.86%,Na2O+K2O含量为4.73%~5.74%,属中-酸性系列火山岩(英安质凝灰岩),反映出该火山岩具高铝低镁,典型的碱性-钙碱性岩系列特征。U-Pb测年为(215±1.4)Ma,属晚三叠世诺利期产物,为缅泰马地块与兰坪-思茅地块碰撞时间的确定提供了依据,同时探讨了形成的构造背景。
      Abstract: The B.Xiang-Nou area of northern Laos is located in the Jinghong-Sukhothai volcanic arc of the western Nan-Uttaradit suture tectonically, where the volcanic rocks are developed. The tuff accompanied with volcanic conglomerate is occurred in the bottom of Late Triassic Nan-tuan Formation. A 1:200 profile measurement had been carried out for the area of exposed volcanic rocks, the samples were collected from every formation of strata for geochemical analysis and zircon U-Pb dating. Their SiO2 contents range from 56.13% to 74.58%, belonging to intermediate-acidic magmatic rocks series (dacitic tuffs), while their Al2O3 and MgO vary from to 13.9% to 25.38% and 0.43% and 0.86%, respectively, showing the features of island arc environment characterized by high aluminum and low magnesium; their Na2O+K2O contents change from 4.73% to 5.74%,presenting a typical feature of alkaline-calc-alkaline series. The U-Pb age of volcanic rocks is (215±1.4 Ma), indicating that these rocks were formed in Late Triassic Norian age, and providing an approach to ensure the collision time and tectonic setting of Burmatama block and Lanping-Simao block.
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    出版历程
    • 收稿日期:  2018-03-06
    • 修回日期:  2018-04-24
    • 网络出版日期:  2022-07-28
    • 发布日期:  2018-09-04

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