红杂色沉积建造中铀矿化的特殊岩石矿物特征——以库车坳陷新近系吉迪克组铀矿点为例
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P619.14

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中核集团"青年英才"科研项目(QNYC2202)


Special rock and mineral characteristics of uranium mineralization in red variegated sedimentary formations: Taking the uranium occurrence of Neogene Jidike Formation in Kuqa Depression as an example
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    摘要:

    近年来,我国北方砂岩型铀矿勘查在中新生代红杂色沉积建造中不断取得找矿突破,但关于红层中的铀成矿作用机制存在较大争议,成为当前研究的热点。库车坳陷新近纪红层中发育大量铀矿化露头信息,开展相关研究有助于分析红杂色层中铀富集机理。通过系统的沉积学、岩石学及矿物学研究对吉迪克组红杂色层铀矿化点进行解剖,发现了较为特殊的铀矿化类型: 矿化层产于干旱背景下湖相沉积环境,呈薄层透镜状产于大套红色泥岩中,矿化岩性为灰绿色泥灰岩并发育大量红化硅质团块,矿化具有层控特征并与硅质团块密切相关,硅质团块具有红化微晶石英、萤石、铀石、方解石以及少量自然砷、黄铜矿和重晶石共生矿物组合,与华南花岗岩型硅质脉铀矿化极为相似,显示出深部热液成因特征; 综合判断该矿化层具有沉积和热液双重作用,是特殊的热水沉积型铀矿化。这类铀矿化的发现为深部热液携带铀进入沉积盆地发生铀成矿作用带来直接有力证据,丰富了陆相盆地沉积型铀成矿理论。

    Abstract:

    In recent years, the exploration of sandstone-type uranium deposits in the northern part of China has made breakthroughs in the Mesozoic and Cenozoic red-colored sedimentary formations. However, there is a great controversy about the mechanism of uranium mineralization in red beds, which has become a hot topic of current research. A large amount of uranium mineralization outcrop information is developed in the Neogene red layer in the Kuqa Depression. Carrying out relevant research is very helpful in analyzing the uranium enrichment mechanism in the red variegated layer. Through systematic sedimentology, petrology and mineralogy, the uranium mineralization spots in the red variegated layer of the Jidike Formation were dissected, and a relatively special type of uranium mineralization was discovered: the mineralized layer was located in a lacustrine sedimentary environment under an arid background. It is produced in a large set of red mudstone in the shape of a thin layer of lens. The mineralization lithology is gray-green marl and develops a large number of reddened siliceous masses. The mineralization has layer-controlled characteristics and is closely related to the siliceous masses. The siliceous mass has a combination of reddish microcrystalline quartz, fluorite, uranite, calcite and a small amount of natural arsenic, chalcopyrite and barite intergrowth minerals. The siliceous mass is very similar to the granite-type siliceous vein uranium mineralization in South China, showing the characteristics of deep hydrothermal origin. It is comprehensively judged that this mineralized layer has dual effects of sedimentation and hydrothermal fluid, and is a special hot water deposition type uranium mineralization. This type of uranium mineralization discovery provides direct and strong evidence that deep hydrothermal fluids could carry uranium into sedimentary basins to undergo uranium mineralization, and improve the theory of sedimentary uranium mineralization in continental basins.

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郭强,肖菁,刘念,等, 2024. 红杂色沉积建造中铀矿化的特殊岩石矿物特征——以库车坳陷新近系吉迪克组铀矿点为例[J]. 岩石矿物学杂志, 43(5):1268~1280.
GUO Qiang, XIAO Jing, LIU Nian, et al, 2024. Special rock and mineral characteristics of uranium mineralization in red variegated sedimentary formations: Taking the uranium occurrence of Neogene Jidike Formation in Kuqa Depression as an example[J]. Acta Petrologica et Mineralogica, 43(5): 1268~1280.

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  • 收稿日期:2023-12-26
  • 最后修改日期:2024-06-01
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  • 在线发布日期: 2024-09-25
  • 出版日期: 2024-09-25