| 阿拉善地块北缘雅干花岗岩体地球化学、地质年代学及其对区域构造演化制约 |
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| 引用本文： | 郑荣国,吴泰然,张文,冯继承,徐操,孟庆鹏,张昭昱.阿拉善地块北缘雅干花岗岩体地球化学、地质年代学及其对区域构造演化制约[J].岩石学报,2013,29(8):2665-2675. |
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| 作者姓名： | 郑荣国 吴泰然 张文 冯继承 徐操 孟庆鹏 张昭昱 |
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| 作者单位： | 造山带和地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京100871 |
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| 基金项目： | 本文受国家自然科学基金项目(41040017)资助. |
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| 摘 要： | 位于阿拉善北部中蒙边境地区的雅干花岗岩体以二长花岗岩为主,岩体的锆石离子探针U-Pb年龄为283.2±2.2Ma (n=14,MSWD=0.016).该花岗岩体具有相对较低的SiO2含量(66.96％～70.71％),和较高的A12O3(15.05％～16.05％)和(Na2O+ K2O)含量(7.24％～9.19％),且岩体钠含量稍高(Na2O/K2O＞1).雅干花岗岩体总体上表现为高钾钙碱性及偏铝质-过铝质的特征.岩体稀土元素总合量为101.9×10-6～133.1 ×1O-6,在稀土元素配分模式图中,岩体表现为轻-重稀土元素中等程度-强烈分异,同时具有明显的负Eu异常(δEu =0.59 ～0.77)；在微量元素原始地幔标准化蛛网图中,岩体表现为亏损Nb、Ta、P、Ti,富集Ba、Rb、Cs、Th、K等大离子亲石元素；岩体同位素特征则表现为具有高的(87 Sr/86 Sr)i值(0.707654 ～0.710235)以及负εNd(t)值.根据雅干花岗岩体的形成时代、地球化学特征以及相关的沉积建造特征,可推断该岩体形成于后碰撞环境,表明古亚洲洋在阿拉善地块北缘北部地区的分支于早二叠世(283.2 ±2.2Ma)之前已经闭合.
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| 关 键 词： | 阿拉善地块北缘 锆石SIMS U-Pb 后碰撞 |
| 收稿时间： | 2011/9/20 0:00:00 |
| 修稿时间： | 2012/10/1 0:00:00 |
Geochronology and geochemistry of the Yagan granite in the northern margin of the Alxa block: Constraints on the tectonic evolution of the southern Altaids. |
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| ZHENG RongGuo,WU TaiRan,ZHANG Wen,FENG JiCheng,XU Cao,MENG QingPeng and ZHANG ZhaoYu.Geochronology and geochemistry of the Yagan granite in the northern margin of the Alxa block: Constraints on the tectonic evolution of the southern Altaids.[J].Acta Petrologica Sinica,2013,29(8):2665-2675. |
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| Authors: | ZHENG RongGuo WU TaiRan ZHANG Wen FENG JiCheng XU Cao MENG QingPeng and ZHANG ZhaoYu |
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| Institution: | Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China |
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| Abstract: | |
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| Keywords: | Northern margin of the Alxa block Zircon SIMS U-Pb Post-collision |
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