地学前缘 ›› 2016, Vol. 23 ›› Issue (3): 51-58.DOI: 10.13745/j.esf.2016.03.007

• 煤中微量元素分布与富集规律 • 上一篇    下一篇

重庆龙潭组煤中稀土元素地球化学及地质成因分析

郭江峰,姚多喜,陈健,陈萍   

  1. 1. 安徽理工大学 地球与环境学院, 安徽 淮南 232001
    2. 江苏工程职业技术学院 机电工程学院, 江苏 南通 226007
  • 收稿日期:2015-09-17 修回日期:2015-11-30 出版日期:2016-05-15 发布日期:2016-05-15
  • 作者简介:郭江峰（1977—），男，博士研究生，副教授，研究方向为地质工程。E-mail:jfguo@163.com
  • 基金资助:

    国家重点基础研究发展计划“973”项目（2014CB238901）

Geochemistry of the rare earth elements of coals from the Longtan Formation in Chongqing and its geological implication

GUO Jiangfeng,YAO Duoxi,CHEN Jian,CHEN Ping   

  1. 1. School of Earth and Environment, Anhui University of Science & Technology, Huainan 232001, China
    2. School of Mechanical Engineering, Jiangsu College of Engineering and Technology, Nantong 226007, China
  • Received:2015-09-17 Revised:2015-11-30 Online:2016-05-15 Published:2016-05-15

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摘要：

运用电感耦合等离子体质谱(ICPMS)、X射线荧光光谱(XRF)、X射线衍射(XRD)等方法对重庆龙潭组煤中稀土元素的地球化学特征进行研究。结果表明，各煤样稀土元素分布模式相似，总体呈左高右低的宽缓的“V”型曲线，轻稀土曲线段“右倾”，重稀土曲线段较为“平坦”，成煤沼泽受陆源碎屑影响较大。南桐5#煤稀土元素含量高，接近全国平均值的2倍，受汉南古陆、大巴山古陆和龙门山岛屿控制，少量陆源碎屑物来自康滇古陆。东林6#煤中的稀土元素含量低于全国平均值水平，海水作用明显，煤样中稀土元素含量未受碱性火山灰的影响，但其底板受碱性火山灰影响强烈。根据煤层稀土元素含量及其比值分析，研究区龙潭组为海湾/潟湖潮坪及浅海碳酸盐沉积的沉积环境。

关键词: 稀土元素, 地球化学, 煤, 龙潭组

Abstract:

The geochemical features of the rare earth elements of coals from the Longtan Formation in Chongqing were studied using the methods of inductively coupled plasma mass spectrometry (ICPMS), Xray fluorescence (XRF), powder Xray diffraction (XRD). The results show that REE distribution patterns of coal samples are similar with each other. The left curve is at a high degree and the right is low and the curve is like the shape of ‘V’ as a whole. The curve of light REEs is steep and heavy REEs is rather flat in the mass. The coalforming swamps were impacted by terrigenous detrital deeply. There is high content of REEs in No.5 coal seam of Nantong Coal Mine，which is approximate twice of the average value of Chinese coal. It was controlled by Hannan Oldland, Dabashan Oldland and Longmenshan Island, only a little terrigenous detrital material was from Kangdian Oldland. There is low content of REEs in No.6 coal seam of Donglin Coal Mine，which is below the average value of Chinese coal. The effect of marine water was obvious. Although the REE contents of coal samples were not impacted by alkaline tonstein, the floor of No.6 coal seam of Donglin Coal Mine was impacted by it strongly. Based on the analysis of rare earth elements content and its ratios of coal seams, the depositional environments of Longtan Formation in the research region are sea bay (or lagoon) to tidal flat and shallow sea carbonate platform.

Key words: rare earth elements, geochemistry, coal, Longtan Formation

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