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Geochemistry and Mineralogy of Paleocene coal from the Padhrar and darra adam khel coalfields of Pakistan

Acta Geologica Sinica(English Edition) 2022年第6期96卷 2056-2073页

作者： Muhammad UMAIR YANG Ruidong CHENG Wei Salman Ahmed KHATTAK College of Resources and Environmental Engineering Guizhou UniversityGuiyang 550025China Key Laboratory of Karst Georesources and the Environment Ministry of EducationGuizhou UniversityGuiyang 550025China The State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China Mining College of Guizhou University Guiyang 550025China Department of Earth Sciences University of HaripurHaripur 22620KPPakistan The State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China

Pakistan is rich in coal resources,which amount to around 186 billion *** Paleocene Padhrar and darra adam khel coalfields are located in the Central Salt Range Punjab Province and the Khyber Pakhtunkhwa Province,Pakistan,*** coal has not been studied in detail and the darra adam khel coalfields are newlydiscovered,so no research has been done,due to security *** this study,an attempt has been made to study the geochemical and mineralogical characteristics of the Padhrar and darra adam khel coals,in order to learn about the coal quality,element enrichment mechanism,sedimentary medium conditions and potentially valuable elements for coal *** Padhrar and darra adam khel coals are low to medium ash,low moisture content,high in volatiles and high total sulfur *** vitrinite reflectance in darra adam khel coal is higher than in Padhrar coal,indicating either a greater burial depth or the effects of Himalayan *** vitrinite content is dominant in the Padhrar and darra adam khel coals,followed by inertinite and liptinite,the major minerals including quartz,clay minerals,calcite and *** trace elements Ni,As,Be Zn,Ge,Mo,Ta,W,Co and Nb,Sn,Hf,Ta,Pb,Th,Cd,In,Be,V,Cr,Zr,Ag,Li,W and Co are concentrated in some of the Padhrar and darra adam khel coal samples,*** Padhrar coal shows positive Ce,Eu and Gd anomalies,with most of the darra adam khel coal showing negative Ce,Eu and positive Gd anomalies with high *** Al2O3/TiO2 values indicate that the sediment source of the Padhrar and darra adam khel coals is mostly related to intermediate igneous *** Sr/Ba,SiO2+Al2O3,Fe2O3+CaO+MgO/SiO2+Al2O3 and high sulfur content in the Padhrar and darra adam khel coals indicate epithermal and marine water influence with a tidal flat,coal-forming environment and a deltaic coal-forming environment,respectively.

关键词： mineral trace elements Paleocene Padhrar coal darra adam khel coal Pakistan

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