| 大南湖凹陷西山窑组层间氧化带砂岩岩石化学特征 |
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| 引用本文： | 黄国龙,陈绍藩,尹征平.大南湖凹陷西山窑组层间氧化带砂岩岩石化学特征[J].铀矿地质,2004,20(3):129-135. |
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| 作者姓名： | 黄国龙 陈绍藩 尹征平 |
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| 作者单位： | 核工业290研究所,广东,韶关,512026 |
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| 基金项目： | 国家“3 0 5”攻关资助项目“哈密坳陷地浸砂岩型铀矿成矿潜力评价”的部分成果 |
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| 摘 要： | 本文主要利用砂岩样品 (岩心 )的鉴定资料和分析测试数据 ,对区内层间氧化带岩石化学特征作初步研究。根据砂岩的物质组分 ,结合分选性及磨圆度等结构特征 ,与蚀源区物质构成进行对比 ,认为本区沉积物主要来自北部的南湖隆起 ,其次为南部的觉罗塔格山。通过对砂岩结构构造及填隙物含量、胶结类型的研究发现 ,砂岩的孔隙度、渗透率与体重关系密切 ,且与胶结物中碳酸盐含量高低及次生矿物种类、含量有关。统计了与水成铀成矿关系密切的C有 、CO2 、Fe、S、U、Th及伴生元素的含量 ,发现本区氧化带砂岩中这些元素含量比还原带低 ,而Fe3 /Fe2 比值氧化带比还原带高。根据可地浸砂岩型铀矿的成矿条件 ,区内砂岩的有机质含量较高 ,碳酸盐含量中等 ,有部分地段或层位碳酸盐含量较低 ,Fe、S、U、Th及伴生元素的氧化、溶解、迁移、沉淀和富集符合水成铀矿的变化规律。
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| 关 键 词： | 层间氧化带 砂岩岩石特征 氧化带 岩石化学成分 |
| 文章编号： | 1000-0658(2004)03-0129-07 |
| 修稿时间： | 2003年9月1日 |
Petrochemical characteristics of sandstone in interlayer oxidation zone of Xishanyao Formation, Dananhu sag |
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| HUANG Guo-long,CHEN Shao-fan,YIN Zheng-ping.Petrochemical characteristics of sandstone in interlayer oxidation zone of Xishanyao Formation, Dananhu sag[J].Uranium Geology,2004,20(3):129-135. |
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| Authors: | HUANG Guo-long CHEN Shao-fan YIN Zheng-ping |
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| Abstract: | By using identification materials and analytic data of sandstone samples(borehole core),petrochemical characteristics of sandstone from interlayer oxidation zone have been preliminarily studied.According to the material composition,the sorting,and the roundness of clastic material in sandstone,and by comparing these features with those of material constituent of provenance area,it is suggested that sediments in the area are mostly originated from the northern Nanhu uplift,and secondary from the southern Juelutak Mountain.The study of texture and structure,the content of pore-filling matreial,and cementation type of sandstone indicates that the porosity,the permeability of sandstone are closely related to its density,as well as to carbonate content,and the species and content of secondary minerals.The statistics of content of those components that are closely related to hydrogenetic metallogenesis,such as Corg.,CO 2,Fe,S,U,Th and some associated elements have been performed.It is found that the content of these components in sandstone of oxidation zone is lower than that in reduction zone.However,the Fe 3 /Fe 2 ratio in oxidation zone is higher than that in reduction zone.As judged by necessary ore-formation conditions of in-situ leachable sandstone-type uranium deposit,the content of organic carbon in host sandstone is relatively high,the carbonate content is medium(in some horizon or some part the carbonate content is relatively low),the oxidation,migration,and precipitation and concentration of Fe,S,U,Th and associated elements are in coincidence with the variation regularity at hydrogenic uranium deposit. |
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| Keywords: | interlayer oxidation zone petrological features of sandstone oxidation zone chemical composition of rocks |
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