| 龙正江,吴永贵,祝旭双,廖军桥,肖让,刘策,施羽.川南古叙地区含煤岩系中锗、镓等关键金属分布特征及控制因素[J].矿产勘查,2026,17(1):84-94 |
| 川南古叙地区含煤岩系中锗、镓等关键金属分布特征及控制因素 |
| Distribution characteristics and controlling factors of critical metals (Ge, Ga) in the coal-bearing strata of the Guxu area, southern Sichuan |
| 投稿时间：2025-09-03 |
| DOI：10.20008/j.kckc.202601007 |
| 中文关键词: 煤型关键金属 分布特征 控制因素 古叙地区 |
| 英文关键词: critical metals in coal distribution characteristics controlling factors Guxu area |
| 基金项目:本文受四川省地质矿产勘查开发局地质矿产专项项目(SCDZ-DZKC202406)、四川省煤田地质局重点科研项目(KJ2021-1)联合资助。 |
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| 中文摘要: |
| 川南古叙地区煤炭资源丰富，其中煤型关键金属亦具显著的资源潜力。本文通过系统收集该区煤炭勘查资料并补充采样，运用 ICP-MS和 XRF分析了煤(岩)样品中关键金属及常量元素含量，总结了龙潭组煤中锗(Ge)、镓(Ga)等关键金属的分布特征，并基于地球化学指标探讨其控制因素。结果表明:平面上，煤中 Ge、Ga以古蔺复式背斜为界，“北高南低，局部高异常”的特征；垂向上，Ge、Ga等关键金属具“底部富集”的特征。Ge、Ga等关键金属富集具受控于物源与沉积环境的共同作用。区内 C25煤中 Ga在两河矿段(均值 31 μg/g)、石屏井田(均值 42 μg/g，最高 382 μg/g)、象顶井田(均值 25 μg/g)以及岔角滩井田南段(均值 30 μg/g)达到高镓煤级别(>20 μg/g)，显示出该煤层金属 Ga具良好的勘查前景。 |
| 英文摘要: |
| The Guxu area of southern Sichuan possesses abundant coal resources with significant potential forassociated critical metal enrichment. This study systematically collected coal exploration data and supplemented itwith new samples to investigate the distribution and controlling factors of critical metals in the Logntan Formationcoal. The concentrations of critical metals and major elements in coal and rock samples were determined using ICP-MS and XRF. The results revealed distinct spatial patterns for germanium (Ge) and gallium (Ga). Laterally, concen-trations increase northward from the Gulin Anticlinorium, with localized anomalies. Vertically, within the coal-bearing sequence, these critical metals are primarily enriched at the base. The enrichment of these metals is gov-erned by the dual controls of sediment provenance and depositional environment. Specifically, Ga concentrations inthe C25 coal seam reach industrially significant levels (>20 μg/g) in several areas: the Lianghe mining block (avg. 31 μg/g), the Shiping mine field (avg. 42 μg/g, max. 382 μg/g), the Xiangding mine field (avg. 25 μg/g), and the south-ern section of the Chajiaotan mine field (avg. 30 μg/g). This highlights the considerable resource potential for Ga within this specific coal seam. |
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