摘要
在全面收集石煤中稀土元素含量资料的基础上,探讨了石煤中稀土元素的赋存状态,剖析了石煤中稀土元素的富集成因.结果表明:不同地区石煤中稀土元素含量的差异较大,但均高于中国煤和世界煤中稀土元素的背景值,稀土元素相对富集.石煤中稀土元素的赋存状态多样,但以无机结合态或残渣态为主,部分石煤中稀土元素与有机质有关,部分兼具有机态和无机态.石煤中稀土元素富集的主要因素包括海相沉积环境、沉积物源区供给、热液流体(酸性、碱性、高温岩浆热液和海底喷流等)的侵入和地下水淋滤作用等.L/H、LaN/YbN、δCe、δEu等地球化学参数和稀土元素配分模式可推断石煤形成的物质来源和成矿条件等信息,具重要的地学示踪理论意义.
Abstract
Based on a systemically collection of content of REEs in stone coals,the modes of occurrence,genesis of enrichment.Results indicated that the REEs'concentrations in Chinese stone coals varied greatly among different regions.The REEs in Chinese stone coals were higher than these of Chinese and world coals,suggesting that REEs were relatively enriched in stone coals.There are various modes of occurrence of REEs in stone coals,mainly in inorganic and residual states.REEs were partially related to organic matter as well,and/or of both organic and inorganic associations.The factors for REEs'enrichment in stone coals included:a marine depositional environment,an input of sediments from sources region,an intrusion of hydrothermal fluids(acidic,alkaline,high-temperature magmatic hydrothermal,submarine exhalation,etc.),and a groundwater leaching.The geochemical parameters,such as L/H,LaN/YbN,δCe,δEu,and its normalized distribution patterns of REEs in stone coals,can be used to infer information on the material source and metallogenic conditions,which are of important theoretical and practical significances.
基金项目
国家自然科学基金面上项目(41972173)
安徽省杰出青年科学基金(1908085J14)
矿山地质灾害防治安徽省高等学校重点实验室开放基金(2022-MGDP-05)
NETL
NSTL
万方数据