| 藏北火山岩的微量元素特征——关于弧后盆地演化的地球化学证据 |
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| 引用本文： | 杨瑞英,黄忠祥,邓万明. 藏北火山岩的微量元素特征——关于弧后盆地演化的地球化学证据[J]. 核技术, 1986, 0(2) |
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| 作者姓名： | 杨瑞英 黄忠祥 邓万明 |
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| 作者单位： | 中国科学院高能物理研究所(杨瑞英，黄忠祥)，中国科学院地质研究所(邓万明) |
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| 摘 要： | 用仪器中子活化法测定了藏北火山岩微量元素丰度,结果证明藏北蛇绿岩是形成在一个规模不大,存在时间不长的弧后盆地环境内。根据火山岩的层位关系,岩浆来源和微量元素特征把该盆地的地质演化概括为扩张阶段、封闭阶段和造山后阶段。这种认识与区域地质资料相一致。
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| 关 键 词： | 仪器中子活化分析 微量元素 藏北火山岩 |
Trace element characteristics of the volcanics in the northern Xizang(Tibet) |
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| Yang Ruiying Huang Zhongxiang. Trace element characteristics of the volcanics in the northern Xizang(Tibet)[J]. Nuclear Techniques, 1986, 0(2) |
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| Authors: | Yang Ruiying Huang Zhongxiang |
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| Abstract: | Abundances of trace and rare earth elements from a representative volcanics in the northern Xizang have been measured by instrumental neutron activation analysis. The results indicate that the ophiolitic complex was formed in a small back-arc basin. On the basis of the stratigraphy, magmatic source and geochemical characteristics of volcanics, the evolution process of the northern Xizang back-arc basin may be summarized into three continual periods as following: the expanding, the clossing and post-orogenic periods. Distinct volcanism was occurred in each periods. This hypothesis is consistent with regional geologic data. |
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| Keywords: | instrumental neutron activation analysistrace element volcanics in the northern Xizang |
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