| 内蒙古科右前旗一带梅勒图组火山岩U-Pb测年及地球化学特征 |
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| 引用本文： | 吴昊,陈满,龚全德,曹元宝,张力强,刘学元,杜士澍,秦越强,陈彪,张钧贵,孙浩,郝森.内蒙古科右前旗一带梅勒图组火山岩U-Pb测年及地球化学特征[J].地质通报,2019,38(11):1836-1845. |
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| 作者姓名： | 吴昊 陈满 龚全德 曹元宝 张力强 刘学元 杜士澍 秦越强 陈彪 张钧贵 孙浩 郝森 |
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| 作者单位： | 武警黄金第四支队, 辽宁辽阳 111000,武警黄金第四支队, 辽宁辽阳 111000,武警黄金第四支队, 辽宁辽阳 111000,武警黄金第四支队, 辽宁辽阳 111000,武警黄金第四支队, 辽宁辽阳 111000,武警黄金第四支队, 辽宁辽阳 111000,武警黄金第四支队, 辽宁辽阳 111000,武警黄金第四支队, 辽宁辽阳 111000,武警黄金第四支队, 辽宁辽阳 111000,武警黄金第四支队, 辽宁辽阳 111000,武警黄金第四支队, 辽宁辽阳 111000,武警黄金第四支队, 辽宁辽阳 111000 |
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| 基金项目： | 中国地质调查局项目《内蒙古东部复兴屯、树木沟、特格乌拉、苑家街1：5万地质矿产综合调查》（编号：12120115041901） |
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| 摘 要： | 通过对科右前旗一带梅勒图组火山岩LA-ICP-MS锆石U-Pb定年和元素地球化学分析,获得梅勒图组安山质晶屑熔结凝灰岩及安山岩的喷发年龄分别为125.6±1.6Ma和120.2±2.2Ma,指示梅勒图组火山岩的形成时代介于120～126Ma之间,形成于早白垩世中期。岩石具有高的SiO_2(60.4%～65.3%)和全碱(7.0%～9.5%)含量,铝饱和指数A/CNK为0.89～0.98,属于钾玄岩及高钾钙碱性系列;稀土元素总量为124×10~(-6)～169×10~(-6),(La/Yb)N值为5.83～13.4,负Eu异常微弱(δEu=0.84～1.05);在原始地幔标准化微量元素蛛网图上,样品富集Rb、Ba、Th、U、K、La、Nd,亏损Nb、Ta、P和Ti,Sr/Y值介于19.4～29.7之间。其岩石源区为富集地幔,岩浆上升过程中受到地壳物质的混染,岩石形成于板内伸展环境,其地球动力学背景可能与古太平洋板块的俯冲有关。
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| 关 键 词： | LA-ICP-MS锆石U-Pb定年 地球化学 梅勒图组 火山岩 内蒙古科右前旗 |
| 收稿时间： | 2018/3/8 0:00:00 |
| 修稿时间： | 2018/6/25 0:00:00 |
A study of geochronology and geochemistry of volcanic rocks from Meiletu Formation in Horqin Right Wing Front Banner, Inner Mongolia |
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| WU Hao,CHEN Man,GONG Quande,CAO Yuanbao,ZHANG Liqiang,LIU Xueyuan,DU Shishu,QIN Yueqiang,CHEN Biao,ZHANG Jungui,SUN Hao and HAO Sen.A study of geochronology and geochemistry of volcanic rocks from Meiletu Formation in Horqin Right Wing Front Banner, Inner Mongolia[J].Geologcal Bulletin OF China,2019,38(11):1836-1845. |
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| Authors: | WU Hao CHEN Man GONG Quande CAO Yuanbao ZHANG Liqiang LIU Xueyuan DU Shishu QIN Yueqiang CHEN Biao ZHANG Jungui SUN Hao and HAO Sen |
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| Institution: | The Fourth Detachment of Gold Headquarters, Chinese Armed Police Force, Liaoyang 111000, Liaoning, China,The Fourth Detachment of Gold Headquarters, Chinese Armed Police Force, Liaoyang 111000, Liaoning, China,The Fourth Detachment of Gold Headquarters, Chinese Armed Police Force, Liaoyang 111000, Liaoning, China,The Fourth Detachment of Gold Headquarters, Chinese Armed Police Force, Liaoyang 111000, Liaoning, China,The Fourth Detachment of Gold Headquarters, Chinese Armed Police Force, Liaoyang 111000, Liaoning, China,The Fourth Detachment of Gold Headquarters, Chinese Armed Police Force, Liaoyang 111000, Liaoning, China,The Fourth Detachment of Gold Headquarters, Chinese Armed Police Force, Liaoyang 111000, Liaoning, China,The Fourth Detachment of Gold Headquarters, Chinese Armed Police Force, Liaoyang 111000, Liaoning, China,The Fourth Detachment of Gold Headquarters, Chinese Armed Police Force, Liaoyang 111000, Liaoning, China,The Fourth Detachment of Gold Headquarters, Chinese Armed Police Force, Liaoyang 111000, Liaoning, China,The Fourth Detachment of Gold Headquarters, Chinese Armed Police Force, Liaoyang 111000, Liaoning, China and The Fourth Detachment of Gold Headquarters, Chinese Armed Police Force, Liaoyang 111000, Liaoning, China |
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| Abstract: | |
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| Keywords: | LA-ICP-MS zircon U-Pb dating geochemistry Meiletu Formation volcanic rock Horqin Right Wing Front Banner Inner Mongolia |
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