| 藏南吉隆地区早古生代大喜马拉雅片麻岩锆石SHRIMP U-Pb年龄、Hf同位素特征及其地质意义 |
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| 引用本文： | 王晓先,张进江,杨雄英,张波.藏南吉隆地区早古生代大喜马拉雅片麻岩锆石SHRIMP U-Pb年龄、Hf同位素特征及其地质意义[J].地学前缘,2011,18(2):127-139. |
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| 作者姓名： | 王晓先 张进江 杨雄英 张波 |
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| 作者单位： | 1. 造山带与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
2. 造山带与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;中国地质科学院,地质研究所,北京,100037 |
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| 摘 要： | 藏南吉隆地区眼球状片麻岩是大喜马拉雅结晶岩系的一部分,其矿物组成为石英、斜长石、钾长石、黑云母和少量的白云母.片麻岩中的锆石具有核一边结构,由继承碎屑锆石核和具有同心环带结构的岩浆锆石边组成.SHRIMP U-Pb测年显示,边部岩浆锆石加权平均年龄为(498.9±4.4)Ma,表明片麻岩的原岩为早古生代的花岗岩,εHf...
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| 关 键 词： | 大喜马拉雅 眼球状片麻岩 SHRIMP U-Pb定年 Hf同位素 早古生代造山作用 |
Zircon SHRIMP U-Pb ages,Hf isotopic features and their geological significance of the Greater Himalayan Crystalline Complex augen gneiss in Gyirong Area,south Tibet |
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| Wang Xiaoxian,Zhang Jinjiang,Yang Xiongying,Zhang Bo.Zircon SHRIMP U-Pb ages,Hf isotopic features and their geological significance of the Greater Himalayan Crystalline Complex augen gneiss in Gyirong Area,south Tibet[J].Earth Science Frontiers,2011,18(2):127-139. |
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| Authors: | Wang Xiaoxian Zhang Jinjiang Yang Xiongying Zhang Bo |
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| Institution: | 1.Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education;School of Earth and Space Sciences,Peking University,Beijing 100871,China 2.Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China |
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| Abstract: | The augen gneiss in the Gyirong Area of south Tibet belongs to the Greater Himalayan Crystalline Complex.It consists of quartz,plagioclase,K-feldspar,biotite and minor muscovite.Zircons of the augen gneiss have core-rim structures with inherited cores and magmatic rims indicated by concentric oscillatory zoning.The zircon rims gave a weighted mean age of 498.9±4.4 Ma,hinting that the protoliths of the gneiss was early Paleozoic granite.The εHf ranges between-13.6 and-4.6 with a weighted mean value of-8.3±0.95.It implies that the source of granite came from crust,possibly resulted from partial melting of the crust in the northernmost margin of the India Craton.The zircon SHRIMP U-Pb ages,combined with the published geochronological data,demonstrate that the Himalaya is a composite orogenic belt,which underwent an early Paleozoic orogenesis.The early Paleozoic Himalaya was an Andean-type orogen after the Gondwana assemblying,which resulted from the subduction of the proto-Tethys ocean beneath the India Plate,rather than a Pan-African orogen that was formed by the continent-continent collision during the Gondwana assembly. |
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| Keywords: | Greater Himalayan Crystalline Complex augen-gneiss SHRIMP U-Pb dating Hf isotope early Paleozoic orogenesis |
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