| 西藏曲水岩基的时代研究 |
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| 引用本文： | 许荣华,金成伟.西藏曲水岩基的时代研究[J].地质科学,1984,0(4):414-422. |
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| 作者姓名： | 许荣华 金成伟 |
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| 作者单位： | 中国科学院地质研究所 |
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| 摘 要： | 曲水岩基是组成冈底斯花岗岩类岩带的岩基之一。由于该岩基地处交通要道,临近拉萨,因此自五十年代以来,许多地质学家在这里工作过。本岩基也是冈底斯岩带中同位素地质年代学研究得最多、最详细的一个岩基。前人的研究表明,对曲水岩基的时代和成因的认识分歧很大。我们自1974年以来持续对该岩基的岩石学、地球化学和同位素地质年代学进行了研究。
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| 关 键 词： | , |
| 收稿时间： | 1983-04-07 |
| 修稿时间： | 1983-04-07; |
A GEOCHRONOLOGICAL STUDY OF THE QUXU BATHOLITH, XIZANG |
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| Xu Eonghua,Jin Chengwei.A GEOCHRONOLOGICAL STUDY OF THE QUXU BATHOLITH, XIZANG[J].Chinese Journal of Geology,1984,0(4):414-422. |
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| Authors: | Xu Eonghua Jin Chengwei |
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| Institution: | Institute of Geology, Academia Sinica, Beijing |
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| Abstract: | This paper deals with U-Pb and Rb-Sr dating of the rocks from the Quxu batho-lith. We obtained a concordant age on the zircons and Rb-Sr whose rock-mineral iso-chron, the age of the principal facies of the pluton is 40-50 M.Y., and calculated the initial ratio of strontium 0.7048-0.7049. This pluton can be mostly considered as the product of remelting of lower crust. Rb-Sr whole rock data indicate that the initial ratio of strontiun did not get completely homogeneous during the crystalization of the magma, as we can not precisely obtain the Rb-Sr whole roek isochron and the initial ratio of strontium. |
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| Keywords: | , |
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