| 内蒙古敖汉旗大黄花正长花岗岩锆石U-Pb年代学及地球化学特征 |
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| 引用本文： | 李斌,陈井胜,张建伟,李伟,刘淼.内蒙古敖汉旗大黄花正长花岗岩锆石U-Pb年代学及地球化学特征[J].地质与资源,2016,25(2):113-120. |
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| 作者姓名： | 李斌 陈井胜 张建伟 李伟 刘淼 |
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| 作者单位： | 1. 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;2. 吉林大学 地球科学学院, 吉林 长春 130061;3. 青岛大学 环境科学系, 山东 青岛 266071 |
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| 基金项目： | 中国地质调查局项目“内蒙古1∶5万敖汉旗(K50E011024)，捣格朗营子(K51E011001)，新地(K50E012024)，铁匠营子(K51E012001)幅区域地质矿产调查”(编号12120113053400)，“内蒙古敖汉旗大黄花地区矿产地质调查”(编号12120114055501) |
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| 摘 要： | 通过研究大黄花正长花岗岩的锆石U-Pb年代学,结合地球化学特征,探讨其形成时代、岩石成因及其构造背景.大黄花正长花岗岩的同位素测试结果为162.6±1.9 Ma,表明该岩体形成于中侏罗世晚期.该花岗岩主量元素具有高Si、富碱、低P和Ca的特征,微量元素具明显的Eu、Ba、Sr、P、Ti负异常.岩石经历了高分异演化(DI=95.1~95.88),为高分异I型花岗岩.极低的Sr/Yb比值暗示其形成于一个非常低压的熔融环境.结合岩石地球化学、区域地质特征,认为大黄花正长花岗岩是蒙古-鄂霍次克缝合带演化的产物,其形成于碰撞后的伸展环境.
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| 关 键 词： | 正长花岗岩 锆石U-Pb年代学 地球化学 敖汉旗 内蒙古 |
| 收稿时间： | 2015-06-03 |
ZIRCON U-Pb GEOCHRONOLOGY AND GEOCHEMISTRY OF THE DAHUANGHUA SYENOGRANITE IN AOHAN QI,INNER MONGOLIA |
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| LI Bin,CHEN Jing-sheng,ZHANG Jian-wei,LI Wei,LIU Miao.ZIRCON U-Pb GEOCHRONOLOGY AND GEOCHEMISTRY OF THE DAHUANGHUA SYENOGRANITE IN AOHAN QI,INNER MONGOLIA[J].Geology and Resources,2016,25(2):113-120. |
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| Authors: | LI Bin CHEN Jing-sheng ZHANG Jian-wei LI Wei LIU Miao |
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| Institution: | 1. Shenyang Institute of Geology and Mineral resources, CGS, Shenyang 110034, China;2. College of Earth Sciences, Jilin University, Changchun 130061, China;3. Department of Environmental Science, Qingdao University, Qingdao 266071, Shandong Province, China |
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| Abstract: | Based on the study of zircon U-Pb geochronology and geochemistry of the Dahuanghua syenogranite in Aohan Qi, Inner Mongolia, the formation time, petrogenesis and tectonic background are discussed. The result of the zircon U-Pb age by laser ablation ICP-MS technique is 162.6±1.9 Ma, indicating that the Dahuanghua syenogranite is formed in late Middle Jurassic. The major and rare elements are characterized by high Si, rich alkaline and obviously negative Eu, Ba, Sr, P and Ti anomalies. The rock, which experienced a high fractionate evolution(DI=95.1-95.88), is highly fractionated I-type granite. The low Sr/Yb ratio implies that it was formed in a melting environment with very low pressure. Combining the geochemical and regional geological characteristics, it is suggested that the Dahuanghua syenogranite should be generated in postcollisional extension tectonic setting with the evolution of Mongolian-Okhotsk suture zone. |
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| Keywords: | syenogranite zircon U-Pb age geochemistry Aohan Qi Inner Mongolia |
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