内蒙古二连盆地哈达图砂岩铀矿渗出铀成矿作用
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P619.14

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国家自然科学重点基金“砂岩型铀矿铀及伴生元素与有机质迁移富集机理”(U2167210)、中核集团集中研发项目“第四代铀矿勘查关键技术研究与示范”和“二连铀矿基地勘查关键技术研究与示范”共同资助。


Exudative metallogeny of the Hadatu sandstone—type uranium deposit in the Erlian Basin, Inner Mongolia
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    摘要:

    [研究目的]哈达图铀矿床是产于二连盆地下白垩统赛汉组上段的一个特大型砂岩型铀矿床,其与传统砂岩铀矿特点不同,矿体呈多层板状,控矿灰色砂体具“两黄夹一灰”特征,传统的渗入(潜水氧化、层间氧化)砂岩型铀成矿理论难以解释,阐明其成因和控矿要素对创新砂岩铀成矿理论与红杂色砂岩中铀矿找矿均具有重大意义。[研究方法]采用野外和室内、宏观和微观相结合,主要包括野外观察、区域地质、构造学、沉积学、岩石学、矿物学、地球化学(元素、有机、同位素)、地震解释和铀矿床学等方法。[研究成果]阐明了矿床矿体、控矿灰色砂体和矿化特征,指出研究区红杂色建造赛汉组上段、二连组和伊尔丁曼哈组为原生氧化建造成因,主含矿层赛汉组上段控矿灰色砂体是深部还原性流体对其再还原的结果,主要受连通深部的断裂构造及相关河道或不整合面控制,属后生改造成因,从成矿铀源、深部渗出流体的形成、铀的迁移和沉淀阐述了砂岩渗出铀成矿作用机制,提出哈达图砂岩铀矿床主要是渗出铀成矿作用形成,建立了相应的渗出铀成矿模式。[结论]发现揭示了红杂色砂岩形成砂岩铀矿一种新的铀成矿作用——渗出铀成矿作用,并由此提出了在红杂色沉积建造中寻找砂岩铀矿“上红下黑、上下连通、红中找灰、灰中找矿”预测评价的新思路,指出针对红杂色沉积建造砂岩铀矿找矿新层位,在找矿空间上可由盆缘拓展到盆中、由浅部拓展到深部。
    创新点:阐明控矿灰色砂体是深部还原性流体再还原的结果,属后生改造成因;提出了红杂色砂岩形成砂岩铀矿新的渗出铀成矿作用,建立了哈达图砂岩铀矿渗出铀成矿模式;提出了在红杂色沉积建造中寻找砂岩铀矿预测评价的新思路。

    Abstract:

    This paper is the result of mineral exploration engineering.
    [Objective]The Hadatu uranium deposit is a giant uranium deposit that occurs in the upper part of the early Cretaceous Saihan Formation in the Erlian Basin. Unlike traditional sandstone-type uranium deposits, the Hadatu uranium orebody exhibits stratiform and tabular shape, and the ore-controlling grey sandstone body is surrounded by red mottled oxidized sandstone. It is difficult to explain the genesis of the Hadatu uranium deposit with the traditional infiltration (phreatic and interlayer oxidization-reduction) metallogenic theory of sandstone-type uranium deposits. Therefore, identification of the ore genesis and ore-controlling factors of the Hadatu uranium deposit becomes very significant to the innovations of metallogenic theory for sandstone-type uranium deposits and to uranium prospecting in red mottled sandstone.
    [Methods]Both fieldwork and lab analysis were conducted, and macro-and micro-observations were made. Adopted methods include field observations, regional geology, tectonics, sedimentology, petrology, mineralogy, geochemistry (i.e. element, organic and isotopic analysis), seismic interpretation and uranium metallogenic studies, etc.
    [Results]The signatures of the orebody, ore-controlling grey sandstone body and the metallogenic characteristics of the Hadatu uranium deposit are clarified. It is evidenced that the upper part of the red mottled Saihan Formation, Erlian Formation and the Irdin Manha Formation are of the primary oxidization origin, whereas the ore-controlling grey sandstone body in the ore-bearing Saihan Formation is of epigenetic origin, resulted from secondary reduction through deep-seated reducing fluids that are mainly controlled by the fault structures and pertinent river channels or unconformities. Based on the analysis of the ore-forming uranium source, fluids deriving from the depth and their transportation and precipitation of the uranium, this paper demonstrates a new exudative uranium metallogeny. The authors propose that Hadatu sandstone-type uranium deposit occurs predominantly by exudative uranium metallogeny and correspondingly establishes the exudative uranium metallogenic model.
    [Conclusions]The exudative uranium metallogeny, as a new kind of uranium metallogeny in red mottled sandstone-type uranium deposits, has been established. The new methods to identify uranium mineralization in red mottled sandstone have been concluded, i.e. "combining the information of the upper red and lower black sedimentary formation, connecting pathways of the upper red formation with lower black one, finding grey sandstone body in red mottled formation and uranium in the grey sandstone body". The perspective of sandstone-type uranium deposits in red mottled sedimentary formation has been pointed out and new prospecting area from margins to the center of the basin and from near surface to deeper strata have been expanded.
    Highlights: Illustrated that the ore-controlling grey sandstone body is of epigenetic origin, resulted from secondary reduction of deep-seated reducing fluids. The authors also propose a new exudative uranium metallogeny in red mottled sandstone and establishes the exudative uranium metallogenic model for Hadatu uranium deposit. Furthermore, the new exploration and evaluation methods to identify uranium mineralization in red mottled red sandstone have been concluded.

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李子颖,刘武生,李伟涛,李西德,秦明宽,蔡煜琦,张云龙,何升,吴曲波,邱林飞,刘持恒,朱鹏飞,纪宏伟,郭建. 内蒙古二连盆地哈达图砂岩铀矿渗出铀成矿作用[J]. 中国地质, 2022, 49(4): 1009-1047.
LI Ziying, LIU Wusheng, LI Weitao, LI Xide, QIN Mingkuan, CAI Yuqi, ZHANG Yunlong, HE Sheng, WU Qubo, QIU Linfei, LIU Chiheng, ZHU Pengfei, JI Hongwei, GUO Jian. Exudative metallogeny of the Hadatu sandstone—type uranium deposit in the Erlian Basin, Inner Mongolia[J]. Geology in China, 2022, 49(4): 1009-1047(in Chinese with English abstract).

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  • 收稿日期:2022-06-19
  • 最后修改日期:2022-07-25
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  • 在线发布日期: 2022-09-09
  • 出版日期: 2022-08-20
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