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首页> 外文期刊>Journal of Asian earth sciences >Architecture of a sandstone uranium reservoir and the spatial distribution of its internal carbonaceous debris: A case study of the Zhiluo Formation, eastern Ordos Basin, northern China
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Architecture of a sandstone uranium reservoir and the spatial distribution of its internal carbonaceous debris: A case study of the Zhiluo Formation, eastern Ordos Basin, northern China

机译：砂岩铀矿储层的构造及其内部碳质碎屑的空间分布-以中国鄂尔多斯盆地东部的智罗组为例

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摘要

The sandstone of the Middle Jurassic Zhiluo Formation, in the eastern Ordos Basin, provides the opportunity for conducting a critical case-study of the architecture and internal carbonaceous debris (CD) distribution of a sandstone uranium reservoir located in a field outcrop in Shiwan. The 16-24 m thick outcrop section is a sandstone-dominated subaqueous distributary channel succession, in which six lithofacies types (Se, St, Sm, Sp, Sh, and FI) occur in a predictable order of repeated fining-upward cycles. These fades emphasize that the dominant structures had been deposited under lower flow regime conditions. Various groups of associated facies have been identified as six distinct architectural elements (intrachannel units, longitudinal bar, transverse bar, diagonal bar, dune complex, and abandoned channel deposits) within a framework of five orders of bounding surfaces. These elements, with specific lithofacies associations and spatial relationships, indicate that the subaqueous distributary channel had involved in four stages of formation: channel-occurring, channel-flooding, channel -waning, and channel -abandonment. Moreover, as one of the most significant reductants in the sand-stone succession, the CD occurs in the form of channel lags and is concentrated in the middle and lower parts of the lag deposit zones. The spatial distribution of CD within the studied succession is controlled by the sandstone architecture and the CD-rich zones are preserved exclusively upon the basal surfaces of intrachannel units, longitudinal and transverse bars. This study can be helpful for exploring the distribution of metallogenic flow field as well as the restriction of the reductants on interlayer oxidation.
机译：鄂尔多斯盆地东部侏罗系中洛组的砂岩，为石湾田露头砂岩铀矿储层的构造和内部碳质碎屑（CD）分布的关键案例研究提供了机会。 16-24 m厚的露头段是砂岩为主的水下分流河道演替，其中六种岩相类型（Se，St，Sm，Sp，Sh和FI）以可重复的向上澄清周期的顺序出现。这些褪色强调了主要结构是在较低流动状态下沉积的。在五阶边界面的框架内，已将各种相关相的组识别为六个不同的建筑元素（通道内单元，纵向杆，横向杆，对角杆，沙丘复合体和废弃的通道沉积物）。这些具有特定岩相联系和空间关系的元素表明，水下分流河道参与了四个形成阶段：河道发生，河道洪水，河道衰落和河道废弃。此外，作为砂岩演替过程中最重要的还原剂之一，CD以河道滞后的形式出现，并集中在滞后沉积区的中下部。 CD的空间分布受砂岩构造的控制，富含CD的区域仅保留在通道内单元，纵向和横向杆的基面上。这项研究有助于探索成矿流场的分布以及还原剂对层间氧化的限制。

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  • 来源
    《Journal of Asian earth sciences》 |2020年第15期|104219.1-104219.13|共13页
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    China Univ Geosci Minist Educ Key Lab Tecton & Petr Resources Wuhan 430074 Peoples R China|China Univ Geosci Sch Earth Resources Wuhan 430074 Peoples R China;

    China Univ Geosci Minist Educ Key Lab Tecton & Petr Resources Wuhan 430074 Peoples R China;

    China Univ Geosci Sch Earth Resources Wuhan 430074 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Sandstone architecture; Barforms; Carbonaceous debris; Zhiluo Formation; Eastern Ordos Basin;

    机译：砂岩建筑;平台碳质碎片;芝罗组鄂尔多斯东部盆地;

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