| 韦访,覃良朝,黄光琼,黄宝宁,黄文芳.靖西三合沉积铝土矿矿石矿物与稀土元素特征分析[J].矿产勘查,2025,16(S1):67-79 |
| 靖西三合沉积铝土矿矿石矿物与稀土元素特征分析 |
| Analysis of ore minerals and rare earth elements characteristics of Sanhe sedimentary bauxite in Jingxi |
| 投稿时间：2024-10-28 |
| DOI：10.20008/j.kckc.2025S1008 |
| 中文关键词: 沉积铝土矿 矿石矿物 岩石地球化学 靖西 |
| 英文关键词: sedimentary bauxite ore minerals rock geochemistry Jingxi |
| 基金项目:本文受中国地质调查局项目(KD-[2023]-XZ-050)资助。 |
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| 中文摘要: |
| 靖西三合沉积铝土矿为桂西典型卡斯特型铝土矿床，研究区位于桂西中部靖西—田东隆起带上。本文通过对矿石与围岩系统采样，手标本观察、镜下鉴定、电子探针、岩石地球化学分析，结果表明沉积铝土矿石结构以砂屑、豆鲕状、粉屑为主，矿石构造以块状为主。矿石主要矿物组成为一水硬铝石、绿泥石、高岭石(伊利石)、锐钛矿、黄铁矿、针铁矿、胶铝矿等，矿物混杂共生具有多期性。 REE配分曲线、 Eu负异、 Ce正异常、全岩 A12O3-TiO2与 Th-Hf-Co图解均指示铝土矿成矿物质更多来自于大陆岩浆弧—海南岛岩浆弧的中—酸性火山岩。 |
| 英文摘要: |
| Jingxi Sanhe sedimentary bauxite deposit is a typical Kasite bauxite deposit in western Guangxi.Through systematic sampling of ore and surrounding rock，hand specimen observation，microscopic identification， electron probe and rock geochemical analysis，the results show that the sedimentary bauxite ore structure is dominated by sand debris，bean oolitic and powder debris，and the ore structure is dominated by block. The main mineral composition of the ore is diaspore，chlorite，kaolinite( illite)，anatase，pyrite，goethite，collophane and so on. The mineral intergrowth is multi-stage. REE distribution curve，Eu negative anomaly，Ce positive anomaly， whole rock Al2O3-TiO2 and Th-Hf-Co diagram indicate that the ore-forming materials of bauxite are more from the intermediate-acid volcanic rocks of continental magmatic arc-Hainan island magmatic arc. |
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