The enrichment of hazardous elements,rare earth elements and other inorganic constituents in a thick coal seam of the Lower Indus Basin,Pakistan
Hassan Nasir Mangi1
Liqiang Ma2
Robert B.Finkelman3
Detian Yan4
Jing Li4
Lara Sindhu5
Umar Ashraf6
1.School of Mines,China University of Mining and Technology,Xuzhou 221116,China;Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education,China University of Geosciences,Wuhan 430074,China2.School of Mines,China University of Mining and Technology,Xuzhou 221116,China;Key Laboratory of Xinjiang Coal Resources Green Mining,Xinjiang Institute of Engineering,Ministry of Education,Urumqi 830023,China3.University of Texas at Dallas,Richardson,TX 75080,USA4.Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education,China University of Geosciences,Wuhan 430074,China5.State Key Laboratory of Microbial Technology,Shandong University,Qingdao 266237,China6.Institute for Ecological Research and Pollution Control of Plateau Lakes,School of Ecology and Environmental Science,Yunnan University,Kunming 650500,China
摘要：The presence of inorganic constituents in coal is controlled by different geological factors,which,in turn,affect the technological,environmental,and health impacts of the coal.The main aim of this study is to objectively assess the mineralogical and geochemical characteristics of a thickest low-rank coal seam in the Lower Indus Basin southeastern Pakistan,and further investigate different controlling factors.The analytical results of major oxides,trace elements,and rare earth elements revealed that the weathering conditions were progressively variable and moderate.The sediment source,mainly of felsic and intermediate composition,was dominated by granitic rocks.The geochemical assessment reveals different depositional factors like marine environment influenced,while transitional and freshwater sediments influenced the center of the coal peat mire.Strontium,Zinc,and several hazardous trace elements,including Cu,Ni,Cr,and Co,have higher concentrations in these coals compared to world low-rank,U.S.,and Chinese coals.The relatively higher concentration of Sr in the thick coal seam in the Lower Indus Basin,compared to other coals seams in Pakistan and the enrichment of Sr was primarily controlled by the denudation of crystalline rocks and marine influx in the coal-basin.The REY distribution pattern showed that enrichment of medium and heavy rare earth elements is higher than light rare earth elements in the coal seam.The Gd distribution pattern in the coal seam demonstrated that strong positive anomalies had a good affinity with paleo-acidic water concentration in the study area.The higher concentration of Sr and other elements enables a better assessment understanding of the coal geochemical history.
机标关键词：earthseamrarebasincoalconstituentselementsenrichment
论文发表日期：2025-06-30
在线出版日期：2025-10-15（本平台首次上网日期，不代表文献的发表时间）
页数：22( 291-312 )
英文信息