| 南秦岭迷魂阵岩体LA-ICP-MS锆石U-Pb年代学和Lu-Hf同位素特征 |
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| 引用本文： | 阎明,刘树文,李秋根,杨朋涛,王伟,郭荣荣,白翔,邓正宾. 南秦岭迷魂阵岩体LA-ICP-MS锆石U-Pb年代学和Lu-Hf同位素特征[J]. 岩石学报, 2014, 30(2): 390-400 |
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| 作者姓名： | 阎明 刘树文 李秋根 杨朋涛 王伟 郭荣荣 白翔 邓正宾 |
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| 作者单位： | 北京大学地球与空间科学学院, 造山带与地壳演化教育部重点实验室, 北京 100871;北京大学地球与空间科学学院, 造山带与地壳演化教育部重点实验室, 北京 100871;北京大学地球与空间科学学院, 造山带与地壳演化教育部重点实验室, 北京 100871;北京大学地球与空间科学学院, 造山带与地壳演化教育部重点实验室, 北京 100871;北京大学地球与空间科学学院, 造山带与地壳演化教育部重点实验室, 北京 100871;北京大学地球与空间科学学院, 造山带与地壳演化教育部重点实验室, 北京 100871;北京大学地球与空间科学学院, 造山带与地壳演化教育部重点实验室, 北京 100871;北京大学地球与空间科学学院, 造山带与地壳演化教育部重点实验室, 北京 100871 |
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| 基金项目： | 本文受国家科技支撑计划课题（2011BAB04B05）、中国地质调查局项目（1212011085534）及国家自然科学基金（41272209、41121062、41072143）资助. |
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| 摘 要： | 位于陕西省的姜家沟-磨沟峡-小岭镇地区的迷魂阵岩体,为南秦岭构造带中一个古老地块内的深成侵入体。该岩体主要由闪长岩、石英闪长岩和花岗闪长岩组成。根据野外地质关系和LA-ICPMS锆石U-Pb定年结果,可将迷魂阵岩体的岩浆作用分为两个阶段:早期岩浆作用阶段主要形成闪长岩,其侵位时代为885±4Ma;晚期岩浆阶段主要形成石英闪长岩-花岗闪长岩,其侵位时代为~737±4Ma。定年锆石原位Lu-Hf同位素分析揭示早期闪长质岩浆主要形成于亏损地幔的部分熔融,晚期石英闪长岩-花岗闪长岩岩浆主要来源于早期闪长质岩浆的结晶分异,并经历了地壳物质的混染或者壳幔岩浆混合作用。
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| 关 键 词： | 锆石U-Pb年代学 Lu-Hf同位素 岩石成因 迷魂阵岩体 南秦岭构造带 |
| 收稿时间： | 2013-05-01 |
| 修稿时间： | 2013-08-17 |
LA-ICP-MS zircon U-Pb chronology and Lu-Hf isotopic features of the Mihunzhen pluton in the South Qinling tectonic belt. |
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| YAN Ming,LIU ShuWen,LI QiuGen,YANG PengTao,WANG Wei,GUO RongRong,BAI Xiang and Deng ZhengBin. LA-ICP-MS zircon U-Pb chronology and Lu-Hf isotopic features of the Mihunzhen pluton in the South Qinling tectonic belt.[J]. Acta Petrologica Sinica, 2014, 30(2): 390-400 |
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| Authors: | YAN Ming LIU ShuWen LI QiuGen YANG PengTao WANG Wei GUO RongRong BAI Xiang Deng ZhengBin |
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| Affiliation: | Key Laboratory of Orogenic Belt and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belt and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belt and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belt and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belt and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belt and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belt and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belt and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China |
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| Abstract: | Mihunzhen pluton, located in Jiangjiagou-Mogouxia-Xiaoling area of Shaanxi Province, emplaced into an older block within the eastern segment of South Qinling tectonic zone. This pluton consists chiefly of diorites, quartz diorites and granodiorites. Field geological relationships and LA-ICP-MS zircon U-Pb isotopic dating results indicate two magmatic emplacement stages of the pluton, namely, diorites at early stage with an age of 885±4Ma, and quartz diorites-granodiorites at late stage with an age of ~737±4Ma. In situ Lu-Hf isotopic analyses for the dated zircon reveal that the early dioritic magma was mainly derived from partial melting of the depleted mantle, and the late quartz dioritic-granodioritic magmas were from crystallization fractionation of the early dioritic magma, which suffered either contaminations of crustal materials or mixing with a crust-sourced magma. |
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| Keywords: | Zircon U-Pb chronology Lu-Hf isotopes Petrogenesis Mihunzhen pluton South Qinling tectonic belt |
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