| 中国东部富碱侵入岩铅同位素组成特征模式及其地质意义 |
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| 引用本文： | 张理刚.中国东部富碱侵入岩铅同位素组成特征模式及其地质意义[J].地球科学,1994,19(2):227-234. |
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| 作者姓名： | 张理刚 |
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| 作者单位： | 地质矿产部宜昌地质矿产研究所 宜昌443003 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 对中国东部１１个铅同位素省内４５个中生代富碱侵入岩体测定了６５个长石和全岩的铅同位素组成，并结合前人资料分析认为。各铅同位素省富碱侵入岩铅同位素组成特征模式与所在铅同位素省中生代中酸性花岗岩类岩石的长石铅同位组成特征模式完全相同，呈等值变化，这就充分暗示富碱侵入岩不太可能属于来自地幔岩浆直接分异产物，而与地壳基底岩石分层深熔或部分熔融作用有关。
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| 关 键 词： | 铅同位素 侵入岩 富碱 地质意义 |
Characteristic Model of Pb Isotopic Compositions of Alkai-Rich Igneous Rocks from Eastern China and Its Geological Significance |
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| Zhang Ligang.Characteristic Model of Pb Isotopic Compositions of Alkai-Rich Igneous Rocks from Eastern China and Its Geological Significance[J].Earth Science-Journal of China University of Geosciences,1994,19(2):227-234. |
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| Authors: | Zhang Ligang |
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| Abstract: | The Pb isotope compositions of feldspar and whole - rocks in 45 Mesozoic alkai - rich ig-neous rocks distributing in 11 various Pb isotope provinces in Eastern China have been measured.Combined with a few of published data, it is found that the characteristic model of Pb isotope compositions of Mesozoic alkai-rich igneous rocks is very coincident with the one of Mesozoic mid-acid granitoids in various Pb isotope provinces in Eastern China. In other words, the Pb isotope compositions of both types of igneous rocks are quite simi-lar to each other in the same Pb isotope province. It can be suggested that the alkai-rich igneous rocks are not derived from the differentiation of mantle magma, but form anatexis of basement rocks in the various provinces. |
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| Keywords: | Pb isotope alkai-rich igneous rock Eastern China |
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