| 内蒙古阿德拉嘎乌拉正长花岗岩锆石U-Pb年龄 |
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| 引用本文： | 张玉清,张建,屈强,高清秀.内蒙古阿德拉嘎乌拉正长花岗岩锆石U-Pb年龄[J].地质与资源,2013,22(4):308-312. |
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| 作者姓名： | 张玉清 张建 屈强 高清秀 |
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| 作者单位： | 1. 内蒙古自治区地质调查院, 内蒙古 呼和浩特 010020;2. 内蒙古第八地质矿产勘查开发院, 内蒙古 乌海 016000;3. 内蒙古第五地质矿产勘查开发院, 内蒙古 包头 014000 |
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| 基金项目： | 中国地质调查局"内蒙古1∶25万红格尔等五幅区调修测"项目 |
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| 摘 要： | 阿德拉嘎乌拉正长花岗岩出露于中蒙边界一线,1∶20万区域地质调查将其划归于燕山早期侵入岩(Kγ52),1∶25万区域地质调查划归于早二叠世碱长花岗岩(P1χγ).通过单颗粒锆石U-Pb同位素稀释法测定其年龄,206Pb/238U表面年龄加权平均值为273.1±0.4 Ma.结合区域地质资料和前人研究成果分析,该正长花岗岩为早二叠世晚期岩浆活动的产物.岩石具高硅、高钾、过铝、贫铁镁钙的特征,属造山后的I型花岗岩.岩石稀土总量偏低,轻重稀土元素分馏程度不明显,δEu在0.07～0.60之间,铕强烈亏损,稀土元素配分曲线呈"V"字型.
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| 关 键 词： | 二叠纪 正长花岗岩 I型 锆石U-Pb年龄 阿德拉嘎乌拉 内蒙古 |
| 收稿时间： | 2013-01-21 |
U-Pb AGE OF ZIRCON FROM THE SYENOGRANITE IN ADELAGAWULA,INNER MONGOLIA |
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| ZHANG Yu-qing
,
ZHANG Jian
,
QU qiang
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GAO Qing-Xiu.U-Pb AGE OF ZIRCON FROM THE SYENOGRANITE IN ADELAGAWULA,INNER MONGOLIA[J].Geology and Resources,2013,22(4):308-312. |
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| Authors: | ZHANG Yu-qing ZHANG Jian QU qiang GAO Qing-Xiu |
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| Institution: | 1. Inner Mongolia Institute of Geological Survey, Hohhot 010020, China;2. No. 8 Institute of Geology and Mineral Exploration and Development, Wuhai 016000, Inner Mongolia, China;3. No. 5 Institute of Geology and Mineral Exploration and Development, Baotou 014000, Inner Mongolia, China |
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| Abstract: | The Adelagawula syenogranite occurs in Abaga Qi, Inner Mongolia, near the Sino-Mongolian border. The intrusive rock was assigned to Early-Yanshanian （Krs2） by 1：200 000 regional geological surveyor or Lower Permian as alkali feldspar granite （P1Xr） in 1：250 000 regional geological survey. The U-Pb isotopic dating of the syenogranite shows the age of 273.1±0.4 Ma. Combined with regional geological data and previous research, it is possibly a product of Early Permian magmatism. The syenogranite, with high silica, high potassium, per-aluminum and poor calcium-magnesium-iron, belongs to post-orogenic I-type granite. The REE distribution is in V-shaped pattern, with low total rare earth content, unobvious fraetionation of LREE and HREE, 8Eu values ranging from 0.07 to 0.60 and strongly depleted Eu. |
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| Keywords: | Permian syenogranite Ⅰ-type zircon U-Pb age Adelagawula Inner Mongolia |
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