| 滇西上地幔铅同位素演化模式及滇西富碱斑岩铅同位素组成的诠释 |
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| 关键词:lead isotope upper mantle two-stage model western Yunnan |
| 基金项目:中国科学院知识创新工程重点项目“扬子地块西缘重大构造事件与高渗透构造域成矿物质迁移富集”(编号:KZCX2101)，国家自然科学基金项目“富碱侵入岩成岩过程中流体聚集的地球化学研究”(编号:40003007)，国家重点基础研究发展规划项目“与不同源花岗质岩浆有关的成矿系统”（编号：G1999043209） |
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| 摘要: |
| The Pb Isotope Evolution Model of the Upper Mantle in Western Yunnan and Interpretation of Lead Isotopic Compositions of Regional Alkali-rich Porphyries |
| Thirty Pb isotope data of the upper mantle in western Yunnan show trends similar to Stacey-Kramers′ two stage model growth curves but apparently deviate from the latter curves on the lead isotope composition programs. This may suggest that Pb isotope of the upper mantle in western Yunnan might have experienced two stages of evolution though it is not fit very well to Stacey-Kramers' two-stage model growth curves. In this paper,a two-stage growth curves model which can better fit the Pb isotope data was constructed on the basis of the lead isotope data of the upper mantle in western Yunnan. With this model,a reasonable interpretation is given to the lead isotopic compositions of the regional alkali-rich porphyries and their related rocks. |
| WU Kai-xing,HU Rui-zhong,BI Xian-wu,ZHANG Qian,PENG Jian-tang.2004.The Pb Isotope Evolution Model of the Upper Mantle in Western Yunnan and Interpretation of Lead Isotopic Compositions of Regional Alkali-rich Porphyries[J].Acta Geoscientica Sinica,25(2):263-270. |
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