淮南深部山西组煤中稀土元素地球化学特征  

Geochemistry of Rare Earth Elements in the Deeply-buried Shanxi Formation Coal Seam of the Huainan Coalfield

作　　者：储安心 郑刘根[1] 刘梦 程世贵 周学年 CHU AnXin;ZHENG LiuGen;LIU Meng;CHENG ShiGui;ZHOU XueNian(School of Resource and Environmental Engineering,Collaborative Innovation Center for Mines Environmental Remediation and Wetland Ecological Security,Anhui University,Hefei 230601,China;China Coal Xinji Energy Co.,Ltd.,Huainan,Anhui 232170,China)

机构地区：[1]安徽大学资源与环境工程学院,安徽省矿山生态修复工程实验室,合肥230601 [2]中煤新集能源股份有限公司,安徽淮南232170

出　　处：《沉积学报》2020年第2期257-265,共9页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目(41373108,41702176);中煤新集集团科技项目(HK-2018-1)。

摘　　要：为探究淮南深部山西组煤中稀土元素来源及地球化学特征,采集淮南煤田深部山西组煤煤样、夹矸、顶板和底板共20个样品,采用电感耦合等离子体质谱仪(ICP-MS)测试样品中稀土元素含量及伴生元素含量,探讨了研究区深部山西组煤中稀土元素地球化学特征。研究结果表明:淮南深部山西组煤中稀土元素含量平均值为40.85 mg/kg,低于中国煤中稀土元素含量平均值;煤中稀土元素配分模式主要是H型配分模式;Eu元素明显负异常,表明煤中稀土元素沉积环境为还原环境;Ce元素呈微弱正异常,表明成煤沼泽环境中海水的影响并未造成Ce的严重亏损;相关性分析结果显示,山西组煤中稀土元素与灰分呈正相关(R^2=0.55),与陆源碎屑元素Al、Cr和Th等呈显著正相关,且与海相特征元素(B、Sr和Ca)相关性不明显。In order to probe the sources and geochemical characteristics of rare earth elements(REE)in coal from the deeply-buried Shanxi Formation coal seam in Huainan,a total of 20 samples of Permian coal,partings,roof and floor were collected from the Huainan coalfield. The content of REE and associated elements in the samples was determined by inductively coupled-plasma mass spectrometry(ICP-MS). The geochemical properties of the REE in the coal within the study area are also discussed. The average REE content was found to be 40.86 mg/kg,which is less than the average for coal in China. The distribution pattern of the REE is mainly H-type partitioning mode. A negative Eu anomaly indicates a reducing depositional environment. Ce exhibited a slightly positive anomaly,indicating that the presence of seawater in the coal-forming swamp environment did not cause a significant loss of Ce. A slightly positive correlation was found between REE and ash content(R^2= 0.55),and a positive correlation with the terrigenous clastic elements Al,Cr and Th. No obvious correlation was found with the characteristic marine elements B,Sr and Ca.

关 键 词：淮南煤田 稀土元素 山西组煤 地球化学 

分 类 号：P595[天文地球—地球化学]