• 論文
主辦單位:煤炭科學研究總院有限公司、中國煤炭學會學術期刊工作委員會
煤系鋁土礦中鈾與釷富集特征及其自然伽馬異常響應
  • Title

    Uranium and thorium enrichment characteristics of bauxite in coal measure strata and their natural gamma-ray responses

  • 作者

    張曉慧張尚清劉東娜趙峰華趙軍鐘莊華侯旭勤

  • Author

    ZHANG Xiaohui;ZHANG Shangqing;LIU Dongna;ZHAO Fenghua;ZHAO Jun;ZHONG Zhuanghua;HOU Xuqin

  • 單位

    太原理工大學 礦業工程學院中國礦業大學(北京) 地球科學與測繪工程學院山西省第三地質工程勘察院有限公司

  • Organization
    College of Mining Engineering, Taiyuan University of Technology
    School of Geosciences & Surveying Engineering, China University of Mining and Technology (Beijing)
    Third Geoengineering Survey Institute of Shanxi Province
  • 摘要

    山西省煤系鋁土礦資源豐富,深部鋁土礦資源評價正逐步開展,為進一步確定煤中鋁資源稟賦,探求高效勘查方法,以山西孝義地區上石炭統煤系鋁土礦層為研究對象,選取并采集了3個鉆孔的37個樣品,應用顯微光學分析、XRD、SEM、XRF和ICP-MS等技術方法,在分析煤系鋁土礦層沉積環境和成礦物源的基礎上,研究鋁土礦中鈾(U)、釷(Th)元素的賦存狀態與富集成因,探討U、Th元素的地球化學特征與自然伽馬異常的響應關系。結果表明,研究區鋁土礦層形成于海相堿性弱氧化為主的沉積環境,沉積過程中存在氧化、弱氧化–弱還原和還原環境,且氧化還原條件不斷發生微弱變化;鋁土礦與其頂板黏土巖(礦)物源相似,主要源自酸性巖漿巖,而底板鐵質巖的物源則與玄武巖或鈣質泥巖有關;鋁土礦層U、Th元素異常富集主要受控于物源母巖類型及鋁土礦、黏土礦物和含鈦礦物的吸附能力;鋁土礦中富集的U、Th元素是自然伽馬高異常的主要原因,且Th元素的貢獻較U元素明顯。研究結果對劃分煤系鋁土礦和圍巖、確定煤系鋁土礦的層位及推測礦體厚度具有實際意義,并對開展深部煤系鋁土礦勘探與開發也具有理論指導意義。

  • Abstract

    Shanxi Province boasts abundant bauxite resources occurring in coal measure strata, with the deep bauxite resources in this province subjected to progressive assessment. This study aims to further determine the endowment of aluminum resources within coals in the province and explore efficient exploration methods. To this end, this study investigated the bauxite layers in Upper Carboniferous coal measure strata in the Xiaoyi area, Shanxi Province. It examined 37 samples from three boreholes using methods such as optical microscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray fluorescence spectrometry (XRF), and inductively coupled plasma mass spectrometry (ICP-MS). Based on the analysis of the sedimentary environment and metallogenic provenance of the bauxite layers in coal measure strata, this study delved into the occurrence states and enrichment genesis of uranium (U) and thorium (Th) elements in bauxite and explored the correlations of the geochemical characteristics of U and Th with the natural gamma-ray (GR) anomalies. The results show that: (1) The bauxite layers in the Xiaoyi area were formed in a sedimentary environment dominated by marine, alkaline, and slightly oxidizing conditions. Furthermore, oxidizing, slightly oxidizing - slightly reducing, and reducing environments also existed in the sedimentary process, suggesting constantly slight changes in the redox conditions. (2) The bauxite, sharing similar provenance with clay rocks (ores) on its roof, originates primarily from acidic magmatic rocks, while ferruginous rocks on its floor are associated with basalts or calcareous mudstones. (3) The anomalous enrichment of U and Th elements in the bauxite layers is primarily dictated by the parent rock types in the provenance area, as well as the adsorption capacity of bauxite and clay and titanium-bearing minerals. (4) The high GR anomalies of the bauxite are primarily induced by the enriched U and Th elements, with Th elements contributing more significantly than U elements. The results of this study hold practical significance for distinguishing bauxite in coal measure strata from surrounding rocks, determining the bauxite’s horizons, and predicting the thicknesses of ore bodies. The results can also serve as a theoretical guide for the exploration and exploitation of deep bauxite in coal measure strata.

  • 關鍵詞

    山西孝義鋁土礦富集成因自然伽馬異常煤系

  • KeyWords

    Xiaoyi, Shanxi;bauxite;uranium;thorium;enrichment genesis;natural gamma-ray anomaly;coal measure

  • 基金項目(Foundation)
    山西省自然科學基金項目(202203021221077,201901D111050);國家自然科學基金項目(41802191)
  • DOI
  • 引用格式
    張曉慧,張尚清,劉東娜,等. 煤系鋁土礦中鈾與釷富集特征及其自然伽馬異常響應[J]. 煤田地質與勘探,2024,52(3):64?78.
  • Citation
    ZHANG Xiaohui,ZHANG Shangqing,LIU Dongna,et al. Uranium and thorium enrichment characteristics of bauxite in coal measure strata and their natural gamma-ray responses[J]. Coal Geology & Exploration,2024,52(3):64?78.
  • 圖表
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