| Paleoproterozoic lower crust beneath Nushan in Anhui Province： Evidence from zircon SHRIMP U-Pb dating on granulite xenoliths in Cenozoic alkali basalt |
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| 引用本文： | HUANGXiaolong XUYigang LIUDunyi JIANPing. Paleoproterozoic lower crust beneath Nushan in Anhui Province： Evidence from zircon SHRIMP U-Pb dating on granulite xenoliths in Cenozoic alkali basalt[J]. 科学通报(英文版), 2003, 48(13): 1381-1385. DOI: 10.1007/BF03184183 |
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| 作者姓名： | HUANGXiaolong XUYigang LIUDunyi JIANPing |
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| 作者单位： | [1]GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences,Guangzhou510640,China [2]LaboratoryofSHRIMPBeijing,InstituteofGeology,ChineseAcademyofGeologicalSciences,Beijing100037,China |
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| 摘 要： | Zircon SHRIMP U-Pb dating was carried out for an intermediate granulite xenolith in Cenozoic alkali basalt from Nushan. The results suggest that the lower crust beneath Nushan may have formed at about 2400—2200 Ma, and have been subjected to granulite-facies metamorphism at 1915 27 Ma. The old age of the Nushan lower crust is consistent with the geochemical similarities between Nushan granulite xenoliths and Archean-Paleoproterozoic granulite terrains in the North China craton, but it is not distinguishable from high-grade metamorphic rocks in the Yangtze craton where such old ages were also reported. Significant Pb-loss occurs in the Nushan zircons, implying important influence of widespread Mesozoic to Cenozoic underplating in East China on the lower crust beneath Nushan.
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| 关 键 词： | 元古代 新生代 安徽 锆石 麻粒岩 捕虏岩 玄武岩 |
| 收稿时间： | 2003-03-25 |
Paleoproterozoic lower crust beneath Nushan in Anhui Province: Evidence from zircon SHRIMP U-Pb dating on granulite xenoliths in Cenozoic alkali basalt |
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| Xiaolong Huang,Yigang Xu,Dunyi Liu,Ping Jian. Paleoproterozoic lower crust beneath Nushan in Anhui Province: Evidence from zircon SHRIMP U-Pb dating on granulite xenoliths in Cenozoic alkali basalt[J]. Chinese science bulletin, 2003, 48(13): 1381-1385. DOI: 10.1007/BF03184183 |
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| Authors: | Xiaolong Huang Yigang Xu Dunyi Liu Ping Jian |
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| Affiliation: | e-mail: xlhuang@gig.ac.cn |
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| Abstract: | Zircon SHRIMP U-Pb dating was carried out for an intermediate granulite xenolith in Cenozoic alkali basalt from Nushan. The results suggest that the lower crust beneath Nushan may have formed at about 2400-2200 Ma, and have been subjected to granulite-facies metamorphism at 1915±27 Ma. The old age of the Nushan lower crust is consistent with the geochemical similarities between Nushan granulite xenoliths and Archean-Paleoproterozoic granulite terrains in the NorthChina craton, but it is not distinguishable from high-grade metamorphic rocks in the Yangtze craton where such old ages were also reported. Significant Pb-lossoccurs in the Nushan zircons, implying important influence of widespread Mesozoic to Cenozoic underplating in East China on the lower crust beneath Nushan. |
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| Keywords: | zircon U-Pb dating granulite xenoliths Paleoproterozoic Nushan. |
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