Variations in the compositional profile of polycyclic aromatic moieties in coals from Bara, Patala and Salt Range formations: Insights into the mechanisms affecting the sedimentary record

IF 4.1 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Physics and Chemistry of the Earth Pub Date : 2025-09-01 Epub Date: 2025-04-18 DOI:10.1016/j.pce.2025.103950

Arif Nazir , Qaiser Hussain , Saeed Abbas , Fraz Khalid , Muhammad Deen , Abid Ali , Munawar Iqbal

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Abstract

This study focuses on the variations in concentration and composition of polycyclic aromatic hydrocarbons (PAHs) in different sedimentary records from Baluchistan, Sindh, and Punjab. Proximate and ultimate analyses, especially calorific values characterized Padhrar coal as bituminous A, Duki coal as highly volatile bituminous C, and sub-bituminous C class for Lakhra coal. The geochemical profile of organic matter was determined using substituted naphthalenes, phenanthrenes, and dibenzothiophenes ratios. Coal samples were thermally mature and indicated shale type lithology as evidenced by geochemical criteria. Moreover, the presence of depositional environmental biomarkers like benzothiophene and alkyl benzothiophene indicated the carbonate evaporate depositional environment, whilst the presence of 1-methylphenanthrene, pyrene, benzopyrene, and perylene in the aromatic fraction revealed the dominance of terrestrial organic matter.

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Bara、Patala和Salt Range地层煤中多环芳烃组分的变化：影响沉积记录的机制

本文研究了俾路支省、信德省和旁遮普省不同沉积记录中多环芳烃（PAHs）的浓度和组成变化。近似分析和最终分析，特别是热值分析表明，Padhrar煤为烟煤A级，Duki煤为高挥发性烟煤C级，Lakhra煤为亚烟煤C级。利用取代萘、菲和二苯并噻吩的比值测定了有机质的地球化学剖面。煤样热成熟，地球化学指标显示为页岩型岩性。沉积环境生物标志物苯并噻吩和烷基苯并噻吩的存在反映了碳酸盐蒸发沉积环境，芳烃组分中1-甲基菲、芘、苯并芘和苝的存在反映了陆相有机质的优势。

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来源期刊

Physics and Chemistry of the Earth 地学-地球科学综合

CiteScore

5.40

自引率

2.70%

发文量

176

审稿时长

31.6 weeks

期刊介绍： Physics and Chemistry of the Earth is an international interdisciplinary journal for the rapid publication of collections of refereed communications in separate thematic issues, either stemming from scientific meetings, or, especially compiled for the occasion. There is no restriction on the length of articles published in the journal. Physics and Chemistry of the Earth incorporates the separate Parts A, B and C which existed until the end of 2001. Please note: the Editors are unable to consider submissions that are not invited or linked to a thematic issue. Please do not submit unsolicited papers. The journal covers the following subject areas: -Solid Earth and Geodesy: (geology, geochemistry, tectonophysics, seismology, volcanology, palaeomagnetism and rock magnetism, electromagnetism and potential fields, marine and environmental geosciences as well as geodesy). -Hydrology, Oceans and Atmosphere: (hydrology and water resources research, engineering and management, oceanography and oceanic chemistry, shelf, sea, lake and river sciences, meteorology and atmospheric sciences incl. chemistry as well as climatology and glaciology). -Solar-Terrestrial and Planetary Science: (solar, heliospheric and solar-planetary sciences, geology, geophysics and atmospheric sciences of planets, satellites and small bodies as well as cosmochemistry and exobiology).