| 海南岛屯昌玄武质科马提岩Sm-Nd同位素年龄及其地质意义 |
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| 引用本文： | 梁新权, 范蔚茗, 许德如. 海南岛屯昌玄武质科马提岩Sm-Nd同位素年龄及其地质意义[J]. 地质科学, 2000, 35(2): 240-244. |
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| 作者姓名： | 梁新权 范蔚茗 许德如 |
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| 作者单位： | 中国科学院长沙大地构造研究所 长沙 410013 |
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| 基金项目： | 中国科学院“七·五”，“八·五”重点黄金项目，资源环境重点项目!( KZ952 -J1-0 0 7)资助 |
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| 摘 要： | 海南岛屯昌玄武质科马提岩成岩时代一直未获解决。作者利用Sm-Nd同位素法测试了5件样品,获得岩石Sm-Nd同位素等时线年龄1687±10Ma,及与其相近的Nd模式年龄1637-1756Ma。同时获得了钕同位素初始比值INd=0.510796±0.000006(2σ),εNd(T)=+6.64。表明玄武质科马提岩结晶年龄为古元古代(1687Ma),反映了海南岛在古元古时期的壳-幔分异与地壳增生的重要过程。
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| 关 键 词： | Sm-Nd年龄 玄武质科马提岩 海南岛屯昌 |
| 收稿时间： | 1998-07-10 |
| 修稿时间： | 1998-07-10 |
SM-ND AGE OF TUNCHANG BASALTIC KOMATIITES AND ITS GEOLOGICAL SIGNIFICANCE IN HAINAN ISLAND |
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| Liang Xinquan, Fan Weiming, Xu Deru. SM-ND AGE OF TUNCHANG BASALTIC KOMATIITES AND ITS GEOLOGICAL SIGNIFICANCE IN HAINAN ISLAND[J]. Chinese Journal of Geology, 2000, 35(2): 240-244. |
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| Authors: | Liang Xinquan Fan Weiming Xu Deru |
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| Affiliation: | Changsha Institute of Geotectonics, Chinese Academy of Sciences, Changsha 410013 |
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| Abstract: | The diagenetic age of Tunchang basaltic komatiites in Hainan Island has never been solved for a long time. Five samples of the basaltic komatiites are taken to be measured by Sm-d radioactive isotope method in this study.The Sm-Nd whole rock isochron age of 1687±10Ma with INd=0.510796±0.000006(2σ) and εNd (T)=+6.64 has been obtained.Meanwhile the basaltic komatiites give Nd model age of 1637-1756 Ma which correspond basically to the isochron age of 1687 Ma.These indicate that Tunchang basaltic komatiites were formed in the Palaeo-proterozoic (about 1687Ma) and its primary magmatic would be derived from a depleted mantle. |
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| Keywords: | Sm Nd age Basaltic komatiite Tunchang of Hainan Island |
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