| 砂体、流体及构造活动对鄂尔多斯盆地泾川铀矿成矿作用的约束 |
| 投稿时间：2025-11-30 修订日期：2025-12-27 |
| 关键词:Jingchuan uranium deposit Key ore controlling factors Sandstone Structure Hydrocarbon bearing fluids, Luohe Formation |
| 基金项目:国家重点研发计划(项目编号: 2023YFC2906700、2018YFC0604200);国家自然科学基金项目(项目编号: 92162212);国际地球科学计划(项目编号: IGCP675) |
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| 摘要: |
| The Constraints of Sandstones, Fluids, and Tectonic Activity on the Mineralization of Jingchuan Uranium Deposit，Ordos Basin |
| The Jingchuan uranium deposit is the world's first super-large uranium deposit discovered in aeolian sandstone areas. It represents a major breakthrough in the exploration of sandstone-type uranium deposits in China in recent years, indicates that the southwestern margin of the Ordos Basin has enormous prospecting potential. This article systematically summarizes the constraints of key ore-controlling factors such as sandstones, fluids, and structures on the mineralization of the Jingchuan uranium deposit by studying its structural characteristics, sandstone characteristics in the ore bearing target layer, altered minerals, and hydrocarbon fluids. The research results show that, the high values of sandstone thickness and ore-bearing sandstone thickness in Jingchuan VI area are basically consistent with the direction of the uranium ore body. The sandstone type uranium mineralization mainly occurs in areas where the thickness of aeolian sand dunes is relatively large or changes from thick to thin. The probability of mineralization is the highest when the thickness of the sandstone is 380m-400m, sandstone content 85%-95% or the ore-bearing sandstone is greater than 30m.The aeolian dunes have good porosity and permeability, providing a thick ore-hosting space for the sandstone-type uranium mineralization. The mudstone formed by desert lakes and other areas serves as an aquiclude, constituting a relatively closed mineralization environment in this deposit. The spatial distribution of the ore bodies reflects the favorable structural positions for sandstone uranium mineralization, which is related to the location of faults and structural (micro) uplift slope belts. Structural activity has a restrictive effect on fluid migration. The sandstones of the Luohe Formation are mainly products of sedimentation in the same aeolian environment. The characteristics of the target layer, such as the fading alteration features, alteration mineral characteristics (such as trivalent iron oxides, carbonates, gypsum, etc.), sulfur isotope characteristics, and uranium mineralization, these ara all indicate that the formation of the ore-bearing sandstones is closely related to the deep-sourced oil and gas or hydrocarbon fluids. |
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