| 西藏冈底斯仁布-拉萨一带花岗岩基的地球化学及其意义 |
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| 引用本文： | 黄玉,赵志丹,张凤琴,朱弟成,董国臣,周肃,莫宣学.西藏冈底斯仁布-拉萨一带花岗岩基的地球化学及其意义[J].岩石学报,2010,26(10):3131-3142. |
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| 作者姓名： | 黄玉 赵志丹 张凤琴 朱弟成 董国臣 周肃 莫宣学 |
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| 作者单位： | 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： | 本文受国家重点基础研究发展规划项目 (2011CB403102、2009CB421002)、国家自然科学基金重点项目(40830317)、国家自然科学基金项目(40873023、41073013、40973026)、教育部新世纪优秀人才支持计划(NCET-10-0711)、111计划(B07011)和中国地质调查局综合研究项目(1212010610104) 联合资助. |
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| 摘 要： | 冈底斯岩基记录了特提斯洋壳俯冲消减过渡到印度与亚洲大陆碰撞的深部过程,可以反演壳幔相互作用和高原地壳加厚的历史。本文对冈底斯岩基中段的仁布岩体和拉萨岩体进行了系统的元素、Sr-Nd-Pb同位素和锆石SHRIMP U-Pb定年与Hf同位素研究。本文测年结果为82～45Ma,仁布岩体和拉萨岩体年龄为晚白垩纪到早第三纪。岩石为含有辉长质和闪长质包体的中酸性花岗岩类,岩石类型复杂。岩石富集轻稀土元素和大离子亲石元素,稀土元素总量较低,具有高场强元素的负异常;Sr-Nd-Pb同位素成分表明新特提斯洋地幔端元的较大贡献,岩石具有亏损的Nd同位素和年轻的地幔模式年龄(εNd=-1.5～3.3,tDM=0.5～1.2)和较大变化范围的正的锆石Hf同位素成分(6个ε单位),表明岩石源区中亏损地幔占有较大贡献,冈底斯岩基显示初生地壳特征。本文进一步揭示出,冈底斯岩基中段存在岩浆底侵与岩浆混合作用,大规模的幔源基性岩浆底侵,不仅导致之后经过岩浆混合形成的花岗岩岩基具有初生陆壳成分,同时也是导致冈底斯南部地壳垂向加厚与增生的重要因素。
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| 关 键 词： | 冈底斯岩基 岩浆混合作用 锆石SHRIMP U-Pb年龄 Sr-Nd-Pb-Hf同位素 地球化学 |
| 收稿时间： | 2010/4/10 0:00:00 |
| 修稿时间： | 2010/6/20 0:00:00 |
Geochemistry and implication of the Gangdese batholiths from Renbu and Lhasa areas in southern Gangdese, Tibet. |
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| HUANG Yu,ZHAO ZhiDan,ZHANG FengQin,ZHU DiCheng,DONG GuoChen,ZHOU Su and MO XuanXue.Geochemistry and implication of the Gangdese batholiths from Renbu and Lhasa areas in southern Gangdese, Tibet.[J].Acta Petrologica Sinica,2010,26(10):3131-3142. |
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| Authors: | HUANG Yu ZHAO ZhiDan ZHANG FengQin ZHU DiCheng DONG GuoChen ZHOU Su and MO XuanXue |
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| Institution: | State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | |
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| Keywords: | Gangdese batholiths Magma mixing Zircon SHRIMP U-Pb dating Sr-Nd-Pb-Hf isotopes Geochemistry |
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