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现代地质 ›› 2016, Vol. 30 ›› Issue (4): 739-747.

• 岩石学 • 上一篇    下一篇

鄂尔多斯盆地东北部直罗组古层间氧化带 形成机制探讨

李西得1,2,易超1,2,高贺伟3,陈心路4,张康1,2,王明太1,2   

  1. 核工业北京地质研究院,北京100029
  • 出版日期:2016-08-31 发布日期:2016-09-08
  • 通讯作者: 易超 ,男,工程师,1985年出生,矿产普查与勘探专业,主要从事铀矿地质方面研究工作
  • 作者简介:李西得,男,高级工程师,1972年出生,地质矿产勘查专业,主要从事铀矿地质方面研究工作
  • 基金资助:
    国家重点基础研究发展计划(“973”计划)项目(2015CB453004);国家高技术研究发展计划(“863”计划)项目(2012AA061801); 中国核工业集团公司重点科技专项“东胜基地铀资源扩大与评价技术研究”(地ZD162-4)。

Study on Formation Mechanism of Epigenetic Altered Zone in Zhiluo Formation, Northeastern Ordos Basin, North China

LI Xide1,2,YI Chao1,2,GAO Hewei3,CHEN Xinlu4,ZHANG Kang1,2,WANG Mingtai1,2   

  1. Beijing Research Institute of Uranium Geology, Beijing100029, China
  • Online:2016-08-31 Published:2016-09-08

摘要: 鄂尔多斯盆地东北部是我国重要的砂岩型铀矿成矿带之一,蕴藏着丰富的铀资源。通过研究发现,区内铀矿床与古层间氧化带具有非常紧密的联系。通过对纳岭沟、大营铀矿床直罗组下段古层间氧化带中各后生蚀变砂岩与原生砂岩的物质成分及地球化学指标的研究,发现绿色砂岩与灰色砂岩在物质成分上的主要区别体现在黏土矿物、方解石及黄铁矿含量上,并且不同蚀变类型砂岩具有其各自的地球化学指标特点。基于对古层间氧化带中各后生蚀变的研究,初步探讨了古层间氧化带的形成机制。这一成果为深化本区铀成矿机理、建立区域铀成矿模式提供了重要的理论依据。

关键词: 地球化学指标, 古层间氧化带, 形成机制, 直罗组, 鄂尔多斯盆地东北部

Abstract: The area of northeastern Ordos Basin, which is rich in uranium resource, is one of the important metallogenic belts for sandstonetype uranium deposits in China. Previous study shows that uranium mineralization here is closely related to paleo interlayer oxidation. On the basic study of material composition and geochemical index of each epigenetic altered sandstone and original sandstone in paleo interlayer oxidation zone in Zhiluo Formation, it can be concluded that the main differences of material composition between green sandstone and gray sandstone are the content of clay minerals, calcites and pyrites. Moreover, the sandstone has its own characteristic of epigenetic alteration in different altered type. Finally, the formation mechanism of paleo interlayer oxidation has been discussed in this paper through the research of each epigenetic altered sandstone features which provides an important theoretical basis for deepening the uranium mineralization mechanism and establishing regional uranium metallogenic model in the study area.

Key words: geochemical index, paleo interlayer oxidation zone, formation mechanism, Zhiluo Formation, northeastern Ordos Basin

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