| 华北板块北缘中段姚五沟岩体锆石U-Pb定年、地球化学特征及其与区域构造演化的关系 |
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| 引用本文： | 林智炜,吴堑虹,奚小双,夏艳菊,刘飚,蒋江波.华北板块北缘中段姚五沟岩体锆石U-Pb定年、地球化学特征及其与区域构造演化的关系[J].地质找矿论丛,2019,34(1):104-116. |
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| 作者姓名： | 林智炜 吴堑虹 奚小双 夏艳菊 刘飚 蒋江波 |
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| 作者单位： | 中南大学有色金属成矿预测与地质环境监测教育部重点实验室,长沙410083;中南大学地球科学与信息物理学院,长沙410083;中南大学有色金属成矿预测与地质环境监测教育部重点实验室,长沙410083;中南大学地球科学与信息物理学院,长沙410083;中南大学有色金属成矿预测与地质环境监测教育部重点实验室,长沙410083;中南大学地球科学与信息物理学院,长沙410083;中南大学有色金属成矿预测与地质环境监测教育部重点实验室,长沙410083;中南大学地球科学与信息物理学院,长沙410083;中南大学有色金属成矿预测与地质环境监测教育部重点实验室,长沙410083;中南大学地球科学与信息物理学院,长沙410083;中南大学有色金属成矿预测与地质环境监测教育部重点实验室,长沙410083;中南大学地球科学与信息物理学院,长沙410083 |
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| 基金项目： | 中南大学自主探索创新项目（编号：2018zzts068）、丰泰矿业有限公司项目（编号：2011021H001）联合资助。 |
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| 摘 要： | 内蒙古太仆寺旗地区的姚五沟岩体位于华北板块北缘中段,主要岩石类型为花岗斑岩。岩体LA-ICP-MS锆石U-Pb测年结果为141.6 Ma±1.3 Ma(MSWD=0.78),形成于晚侏罗世。岩石化学特征显示岩体具高硅富碱的特征,A/CNK=0.93～1.07,为准铝质-弱过铝质,属高钾钙碱性系列。稀土配分模式呈右倾"V"字型,Eu负异常较显著(δEu=0.30～0.43),轻重稀土分异明显(w(La)N/w(Yb)N=34.04～48.59)。微量元素表现出富集Rb、Th、K等大离子亲石元素,亏损Ba、Sr和Nb、Ta、Ti、P等高场强元素,具有较高的10000×w(Ga)/w(Al)值(2.85～2.92)和w(Zr+Nb+Ce+Y)值(537.80×10~(-6)～584.10×10~(-6));表明其属A型花岗岩,由下地壳部分熔融而来,并伴随少量幔源组分参与,形成于非造山伸展环境。与研究区内的后淖S型花岗岩(255.8 Ma±1.6Ma,晚二叠世)和白旗A型花岗岩(134.6Ma±1.1Ma,晚侏罗世)的地球化学特征对比,发现由晚二叠世到晚侏罗世,岩浆源区由上地壳的泥质岩部分熔融转换为下地壳部分熔融,并伴随少量幔源组分参与,其大地构造背景由陆-陆碰撞环境转换为非造山伸展环境。
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| 关 键 词： | 花岗斑岩 LA-ICP-MS锆石U-Pb定年 地球化学特征 构造演化 华北板块北缘中段 内蒙古 |
| 收稿时间： | 2018/3/15 0:00:00 |
| 修稿时间： | 2018/10/26 0:00:00 |
Zircon U-Pb dating and geochemical characteristics of the Yaowugou granite in the middle section of northern margin of the north China plate and its implications to regional tectonic evolution |
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| LIN Zhiwei,WU Qianhong,XI Xiaoshuang,XIA Yanju,LIU Biao and JIANG Jiangbo.Zircon U-Pb dating and geochemical characteristics of the Yaowugou granite in the middle section of northern margin of the north China plate and its implications to regional tectonic evolution[J].Contributions to Geology and Mineral Resources Research,2019,34(1):104-116. |
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| Authors: | LIN Zhiwei WU Qianhong XI Xiaoshuang XIA Yanju LIU Biao and JIANG Jiangbo |
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| Institution: | Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China;School of Geosciences and Info-Physics, Central South University, Changsha 410083, China,Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China;School of Geosciences and Info-Physics, Central South University, Changsha 410083, China,Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China;School of Geosciences and Info-Physics, Central South University, Changsha 410083, China,Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China;School of Geosciences and Info-Physics, Central South University, Changsha 410083, China,Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China;School of Geosciences and Info-Physics, Central South University, Changsha 410083, China and Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China;School of Geosciences and Info-Physics, Central South University, Changsha 410083, China |
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| Abstract: | |
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| Keywords: | granite porphyry LA-ICP-MS zircon U-Pb dating geochemical characteristics geotectonic evolution the middle section of northern margin of the north China plate Inner Mongolia |
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