| 西北内陆盆地的红层类型与砂岩型铀矿 |
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| 引用本文： | 王志龙.西北内陆盆地的红层类型与砂岩型铀矿[J].铀矿地质,1988(4). |
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| 作者姓名： | 王志龙 |
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| 摘 要： | 本文在调研我国西北内陆盆地中的红层与砂岩型铀矿关系的基础上,提出了一个以沉积相和红化成因为基础的红层分类:把内陆盆地中的红层分为陆解阶段形成的冲积平原红层和浅湖红层;成岩后生阶段形成的河流冲积红层、三角洲红层和沙漠红层;以及表生风化阶段形成的溅泼红(次生红层)等6类红层。并依据这6类红层的特征、产出构造环境,以及含矿主岩到各类红层的Eh、pH、Th/U、Fc~(3+)/Fc~(2+)、Sr/Ba等地化特征值的变化,确定了它们与砂岩型铀矿的关系,即陆解阶段岩石红化时为开放环境,活性铀易于流失,对成矿不利;而成岩后生阶段,岩石红化时的环境为封闭系统,对成矿有利,能形成铀矿床。
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| 关 键 词： | 内陆盆地 红层 砂岩铀矿 |
THE RED BED-TYPE AND SANDSTOME-TYPE URANIUM DEPOSITS IN THE INLAND BASINS OF THE NORTHWEST CHINA |
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| Wang Zhilong.THE RED BED-TYPE AND SANDSTOME-TYPE URANIUM DEPOSITS IN THE INLAND BASINS OF THE NORTHWEST CHINA[J].Uranium Geology,1988(4). |
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| Authors: | Wang Zhilong |
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| Institution: | Wang Zhilong |
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| Abstract: | On the basis of the study on the relationship between the red bed-typeand sandstone-type uranium deposits in the inland basins of the northwestChina, this paper presents a classification of red beds based on sedimentaryfacies and redding origin. Red beds in the inland basins can be dividedinto six types: 1. alluvial plain and 2. shallow lake red beds formed atthe stage of continental disintegration; 3. fluvial alluvial red bed, 4. deltaplain and 5. desert red beds formed at the diagenetic-epigenetic stage;6. spattered red (secondary red beds) formed at the hypergenic weather-ing stage. According to the characteristics, structural environments of thesesix types of red beds, and changes of various geochemical characteristicvalues (Eh, pH, Th/U, Fe~3/Fe~2+, Sr/Ba, etc.) from host rocks to diffe-rent kinds of red beds, the relationship between these values and sands-tone-type uranium deposits was determined. That is,when the rock reddens atthe stage of continental disintegration, it is an open system,the mobile ura-nium is easily leached, thus it is unfavourable for mineralization;but when-the rock reddens at the diagenetic epigenetic stage (closed system) thatis favourable for mineraizaltion, the mobile uranium can be concentrated toform uranium deposits. |
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| Keywords: | Inland basin Red bed Sandstone-type uranium deposit |
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