| 某区热液钠交代型铀矿成矿模式 |
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| 引用本文： | 夏同庆,李楷之,郑邦权.某区热液钠交代型铀矿成矿模式[J].矿床地质,1985,4(4):71-80. |
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| 作者姓名： | 夏同庆 李楷之 郑邦权 |
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| 摘 要： | 一、区域地质简况本区位于一个由加里东褶皱带发展起来的复式向斜中,该地槽从中寒武世开始,后经志留纪末期的祁连运动使下古生代地层发生强烈褶皱而结束了地槽沉积,到上古生代由于断块运动形成了一系列断陷一拗陷盆地。其中沉积了泥盆系山麓相、河流相沉积物和石炭系海陆
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Metallogenic model for the uranium deposits of hydrothermal sodium-metasomatic type in a certain area |
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| Abstract: | Widespread in sedimentary and igneous rocks of the study area is a suite of alkali-metasomatie alteration association, in which albitization is predominant and laterization, carbonatization, iron-chloritization and uranium mineralization are also developed. This area, therefore, is favorable for the occurrence of sodium metasomatic type uranium deposits. This paper discusses in detail the characteristics of the mineralized material components and especially the prerequisite nature of the albitization in governing uranium deposition and enrichment as well as the formation mechanism of laterite, indicating that ore-bearing fluids were alkaline hydrothermal solutions rich in sodium, uranium and carbonic acid with uranium existing and migrating in the form of uranyl carbonate complex whose dissolution resulted in a series of alterations and uranium mineralization. The hypothesis that ore fluids were derived from post-magmatic solutions formed by the differentiation and evolution of the sodium-rich intermediate acid volcanic magma has been expounded and proved in terms of coincidence of the spatial distribution inheritance in material components, continuity in time, and evidence obtained from inclusion thermometry and sulfur isotope studies. In this paper the metallogenic model for this sodium metasomatic type uranium deposit has been formulated in the light of regional structure-magmtic activity, and the favorable perspective for ore prospecting has been indicated. |
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