| 西藏冈底斯西部江巴、邦巴和雄巴岩体的锆石U-Pb年代学与Hf同位素地球化学 |
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| 引用本文： | 姜昕,赵志丹,朱弟成,张凤琴,董国臣,莫宣学,郭铁鹰. 西藏冈底斯西部江巴、邦巴和雄巴岩体的锆石U-Pb年代学与Hf同位素地球化学[J]. 岩石学报, 2010, 26(7): 2155-2164 |
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| 作者姓名： | 姜昕 赵志丹 朱弟成 张凤琴 董国臣 莫宣学 郭铁鹰 |
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| 作者单位： | 1. 北京大学地球与空间科学学院,北京100871;中国地质大学地质过程与矿产资源国家重点实验室,中国地质大学地球科学与资源学院,北京100083
2. 中国地质大学地质过程与矿产资源国家重点实验室,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： | 国家“973”项目(2009CB421002)、国家自然科学基金重点项目(40830317)、教育部新世纪优秀人才支持计划(NCET-10-0711)、111计划（B07011）、国家自然科学基金项目(40873023、40973026)和中国地质调查局综合研究项目(1212010610104) |
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| 摘 要： | 对青藏高原冈底斯带西部中生代花岗岩的研究依然十分有限。本文选择青藏高原冈底斯带西部狮泉河-革吉-雄巴地区的三个花岗岩基进行了锆石SHRIMP U-Pb定年和锆石Hf同位素分析,并探讨了中冈底斯带中侏罗世-早白垩世花岗岩的分布特征及其揭示的地壳基底的属性。定年结果表明,江巴岩体花岗闪长岩年龄为170±3Ma,雄巴岩体碱长花岗岩年龄为149±3Ma,它们形成于中晚侏罗世;邦巴岩体寄主岩石正长花岗岩和其中的石英二长闪长岩包体年龄分别为144±3Ma和133±3Ma,形成于早白垩世。锆石Hf同位素和地壳模式年龄结果表明,中晚侏罗世的江巴岩体(εHf(t)为-16.8～-13.4,Hf同位素地壳模式年龄为2.1～2.3Ga)与雄巴碱长花岗岩(-11.3～-6.2和1.6～2.0Ga)具有富集的Hf同位素特征,显示了新元古界的地壳基底年龄。邦巴正长花岗岩(-4～-0.8和1.2～1.5Ga)与其中的闪长质包体(-2.8～+0.6和1.2～1.4Ga)具有一致的Hf同位素特征,显示了岩浆混合作用。本文花岗岩定年与Hf同位素结果进一步揭示出中冈底斯带存在未出露地表的古元古代地壳基底。
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| 关 键 词： | 锆石SHRIMP U-Pb定年；Hf同位素；江巴；邦巴；雄巴；花岗岩；冈底斯；西藏 |
| 收稿时间： | 2010-05-28 |
| 修稿时间： | 2010-06-28 |
Zircon U-Pb geochronology and Hf isotopic geochemistry of Jiangba, Bangba, and Xiongba granitoids in western Gangdese, Tibet |
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| JIANG Xin,ZHAO ZhiDan,ZHU DiCheng,ZHANG FengQin,DONG GuoChen,MO XuanXue and GUO TieYing. Zircon U-Pb geochronology and Hf isotopic geochemistry of Jiangba, Bangba, and Xiongba granitoids in western Gangdese, Tibet[J]. Acta Petrologica Sinica, 2010, 26(7): 2155-2164 |
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| Authors: | JIANG Xin ZHAO ZhiDan ZHU DiCheng ZHANG FengQin DONG GuoChen MO XuanXue GUO TieYing |
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| Affiliation: | School of Earth and Space Sciences, Peking University, Beijing 100871, China; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | |
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| Keywords: | Zircon SHRIMP U-Pb dating Hf isotopes Jiangba Bangba Xiongba granitoids Gangdese Tibet |
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