| 雅鲁藏布江蛇绿岩的氦、氩同位素组成及其地质意义 |
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| 关键词:ophiolite helium argon plume the Yarlung Zangbo River |
| 基金项目:中国博士后科学基金，中国科学院兰州地质研究所气体地球化学国家重点实验室开放基金(编号:2002-03) |
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| Helium and Argon Isotopic Compositions of the Yarlung Zangbo Ophiolites in Tibet and Their Geological Implications |
| Helium and argon isotopic compositions of Yarlung Zangbo ophiolites in Tibet have been determined in this paper. Helium isotopic compositions of basalts from Bailang are quite uniform with the average 3He/4He ratio being 5.359 Ra,whereas the 3He/4He ratios of meta-peridotites associated with the basalts vary between 1.104 Ra and 3.384 Ra with an average value of 2.383 Ra. 3He/4He ratios in diabases gradually increase from Renbu in the east to Bailang and Xialu in the west. The average 3He/4He ratio of three diabase samples from Jiding is as high as 31.57 Ra, close to the previously reported values from Hawaii hotspots. Further stepwise heating studies reveal that the highest 3He/4He ratio is obtained from the lower temperature intervals. All this suggests that plume magmatism must have played an important role in the formation of the Yarlung Zangbo ophiolites. |
| WU Mao-bing,YE Xian-ren,LIU Chun-yan.2004.Helium and Argon Isotopic Compositions of the Yarlung Zangbo Ophiolites in Tibet and Their Geological Implications[J].Acta Geoscientica Sinica,25(6):621-624. |
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