| 内蒙古扎兰屯方家沟岩体锆石U-Pb年龄及地球化学特征 |
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| 引用本文： | 郭威,吴新伟,张渝金,江斌,张超,钱程,陈会军.内蒙古扎兰屯方家沟岩体锆石U-Pb年龄及地球化学特征[J].地质与资源,2015,24(3):193-199. |
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| 作者姓名： | 郭威 吴新伟 张渝金 江斌 张超 钱程 陈会军 |
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| 作者单位： | 1. 吉林大学 地球科学学院, 吉林 长春 130061;2. 中国地质调查局 沈阳地质调查中心(沈阳地质矿产研究所), 辽宁 沈阳 110034 |
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| 基金项目： | 中国地质调查局区域地质调查项目“内蒙古1∶5万济沁河林场等4幅区”（1212011120664）；“内蒙古1∶5万南燕窝沟等4幅区调”（12120113053900）. |
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| 摘 要： | 方家沟地区二长花岗岩中锆石颗粒的晶体内部结构清晰,振荡生长环带发育和较高的Th/U比值(0.99~3.10),反映了岩浆成因特征.LA-ICP-MS锆石U-Pb定年结果为(152.9±2.2)Ma.岩石Si O2含量73.06%~76.25%,里特曼指数(σ)2.51~2.63,具有高钾钙碱性特征,呈过铝质特点.ΣLREE/ΣHREE比值和(La/Yb)N比值分别为6.21~10.43和4.98~12.18,为轻稀土富集、重稀土亏损型.δEu值0.52~0.72,为中弱亏损.以上特征表明方家沟岩体为过铝质高分异I型花岗岩.其成因可能是由于造山后的拉张环境使得地壳减薄,促使软流圈的物质上涌和幔源岩浆的底侵作用,导致地壳的温度升高,减压熔融形成二长花岗岩.
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| 关 键 词： | 方家沟岩体 二长花岗岩 锆石U-Pb 年龄 地球化学 内蒙古 |
| 收稿时间： | 2015-03-31 |
ZIRCON U-Pb DATING AND GEOCHEMISTRY OF THE FANGJIAGOU PLUTON IN ZHALANTUN AREA,INNER MONGOLIA |
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| GUO Wei,WU Xin-wei,ZHANG Yu-jin,JIANG Bin,ZHANG Chao,QIAN Cheng,CHEN Hui-jun.ZIRCON U-Pb DATING AND GEOCHEMISTRY OF THE FANGJIAGOU PLUTON IN ZHALANTUN AREA,INNER MONGOLIA[J].Geology and Resources,2015,24(3):193-199. |
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| Authors: | GUO Wei WU Xin-wei ZHANG Yu-jin JIANG Bin ZHANG Chao QIAN Cheng CHEN Hui-jun |
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| Institution: | 1. College of Earth Sciences, Jilin University, Changchun 130061, China;2. Shenyang Institute of Geology and Mineral Resources, CGS, Shenyang 110034, China |
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| Abstract: | The Fangjiagou monzogranite pluton shows a typical magmatic origin with its clear crystal interior structures of zircon, developed oscillatory growth zonation and high Th/U ratio of 0.99 -3.10. The LA-ICP-MS zircon U-Pb dating is (152.9±2.2) Ma. The rock is peraluminous, belonging to high-K calc-alkali series, with SiO2 content of 73.06%-76.25% and Rittman index (σ) of 2.51-2.63. The ratios of ΣLREE/ΣHREE and (La/Yb)N are respectively 6.21-10.43 and 4.98-12.18, with enrichment in LREEs and depletion in HREEs. The δEu values range from 0.52 to 0.72. The features above indicate that the Fangjiagou pluton belongs to peraluminous highly fractionated I-type granite, which may be formed due to the crust melting by temperature rising and pressure reducing in post-orogenic extensional environment, with crust thinning, materials from asthenosphere upwelling and mantle-derived magma underplating. |
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| Keywords: | Fangjiagou pluton monzogranite zircon U-Pb dating geochemistry Inner Mongolia |
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