| 克里阳钾镁煌斑岩同位素地球化学特征 |
| |
| 关键词:Keliyang lamproite stable isotope radioactive isotope |
| 基金项目:国家自然科学基金项目(49973013)，国家地质调查局(科[2003]00301) |
|
| 摘要点击次数: 2763 |
| 全文下载次数: 2640 |
| 摘要: |
| Isotope Geochemical Characteristics of Lamproite from Keliyang, Xinjiang |
| In this paper, the authors have mainly studied stable and radioactive isotope characteristics of lampoite from Keliyang, Xinjiang.δ 13C andδ 18O are -2.7～-3.3‰ and +14.57～+16.43‰ respectively. The content of compatible elements Cr and Ni and that of incompatible elements Ba, Sr, Nb, Ta, Zr, Hf and Th are relatively depleted, the inert elements and radioactive heat-generating elements are all relatively depleted except for U, and the high field-density elements Nb, Ti and Ta are strongly depleted, suggesting that the origin of the lamproite is related to the subduction. All of these characteristics indicate that the lamproite has preserved the features of its source area. A comparison is made between this lamproite and lamproite in other areas of the world. The initial Sr ratio is 0.70807,which is somewhat high compared with the similar rocks in the world. The 206Pb/ 204Pb ratio is 18.3556, which is rather high. From the Pb and Sr isotopic composition and other geochemical characteristics of the lamproite, it is concluded that it was produced through the mixture of the depleted mantle with the recycling crustal materials. |
| ZHAO Lei,LI You-zhi,CUI Bin,ZHANG Zhao-zhi,LI Jian,LIU Yu-long.2003.Isotope Geochemical Characteristics of Lamproite from Keliyang, Xinjiang[J].Acta Geoscientica Sinica,24(6):599-602. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|