| 西秦岭糜署岭花岗岩体年代学、地球化学特征及其构造意义 |
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| 引用本文： | 李佐臣,裴先治,李瑞保,裴磊,胡波,刘成军,陈国超,陈有炘.西秦岭糜署岭花岗岩体年代学、地球化学特征及其构造意义[J].岩石学报,2013,29(8):2617-2634. |
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| 作者姓名： | 李佐臣 裴先治 李瑞保 裴磊 胡波 刘成军 陈国超 陈有炘 |
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| 作者单位： | 1. 西部矿产资源与地质工程教育部重点实验室,长安大学地球科学与资源学院,西安710054
2. 中国地质大学地球科学与资源学院,北京,100083 |
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| 基金项目： | 本文受国家自然科学基金项目(40972136、41172186、40572121);高等学校博士学科点专项科研基金项目(20110205110004)和中央高校基本科研业务费专项资金(CHD2011TD020、CHD2009JC046、2013G1271092、2013G1271091)联合资助. |
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| 摘 要： | 秦岭造山带南缘勉略缝合带附近发育东西向展布的印支期花岗岩带,位于西秦岭地区勉略缝合带北侧的糜署岭岩体是该花岗岩带的一部分。本文对糜署岭岩体寄主岩及二长闪长质包体进行LA-ICP-MS锆石U-Pb定年和地球化学特征研究。结果表明,糜署岭岩体的结晶年龄为214.5±1.6Ma(MSWD=0.24)。糜署岭岩体寄主岩和二长闪长质包体A/CNK在0.64～0.97之间,具有准铝质特征。稀土元素总量(∑REE)为197.3×10-6～246.6×10-6,在稀土元素配分图上显示为右倾型,Eu具有中等的负异常。高场强元素Ta、Nb、P、Ti和大离子亲石元素Sr、Ba明显亏损,而Rb、U、La、Zr、Hf、Nd、Y等元素具有明显的正异常。寄主岩和包体是同源岩浆演化而来,是以基性岩为主的源岩部分熔融形成的花岗质岩浆上升侵位形成的,为I型花岗岩。糜署岭岩体形成于同碰撞(挤压环境)向碰撞后(伸展环境)转化阶段,为后造山花岗岩类,是印支期扬子与华北地块全面碰撞导致的地壳增厚下地壳部分熔融的产物。
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| 关 键 词： | 糜署岭岩体 锆石U-Pb年龄 地球化学 构造环境 西秦岭造山带 |
| 收稿时间： | 7/1/2012 12:00:00 AM |
| 修稿时间： | 3/3/2013 12:00:00 AM |
LA-ICP-MS zircon U-Pb dating, geochemistry of the Mishuling intrusion in western Qinling and their tectonic significance |
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| LI ZuoChen,PEI XianZhi,LI RuiBao,PEI Lei,HU Bo,LIU ChengJun,CHEN GuoChao and CHEN YouXin.LA-ICP-MS zircon U-Pb dating, geochemistry of the Mishuling intrusion in western Qinling and their tectonic significance[J].Acta Petrologica Sinica,2013,29(8):2617-2634. |
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| Authors: | LI ZuoChen PEI XianZhi LI RuiBao PEI Lei HU Bo LIU ChengJun CHEN GuoChao and CHEN YouXin |
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| Institution: | Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Faculty of Earth Science and Resources, Chang'an University, Xi'an 710054, China;Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Faculty of Earth Science and Resources, Chang'an University, Xi'an 710054, China;Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Faculty of Earth Science and Resources, Chang'an University, Xi'an 710054, China;Faculty of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Faculty of Earth Science and Resources, Chang'an University, Xi'an 710054, China;Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Faculty of Earth Science and Resources, Chang'an University, Xi'an 710054, China;Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Faculty of Earth Science and Resources, Chang'an University, Xi'an 710054, China;Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Faculty of Earth Science and Resources, Chang'an University, Xi'an 710054, China |
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| Abstract: | |
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| Keywords: | Mishuling intrusion Zircon U-Pb age Geochemistry Tectonic setting Western Qinling Orogenic Belt |
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