Geochemistry of Cenozoic coals from Sarawak Basin,Malaysia:implications for paleoclimate,depositional conditions,and controls on petroleum potential
Lanre Asiwaju1
Khairul Azlan Mustapha1
Wan Hasiah Abdullah2
Say Gee Sia3
Mohammed Hail Hakimi4
1.Department of Geology,Faculty of Science,University of Malaya,50603 Kuala Lumpur,Malaysia2.Geological Society of Malaysia,C/O Department of Geology,University of Malaya,50603 Kuala Lumpur,Malaysia3.Department of Mineral and Geoscience,Malaysia,80000 Johor Bahru,Malaysia4.Geology Department,Faculty of Applied Science,Taiz University,6803,Taiz,Yemen
摘要：Forty Tertiary coals from Mukah-Balingian and Merit-Pila coalfields of the Sarawak Basin,Malaysia were investigated using bulk and molecular geochemical techniques such as proximate analysis,gas chromatography-mass spectrometry,elemental analyser,isotope ratio mass spectrometry,and inductively coupled plasma mass spectrometry to reconstruct their paleovegetation,paleoclimate,and environments of deposition.In addition,principal component analysis(PCA)of selected geochemical parameters was carried out to determine the controlling influences on the petroleum potential of the humic coals.δ13C values and the abundance of terpenoids imply the predominant contribution of angiosperms to the paleoflora.Bimetal proxies(Sr/Ba,Sr/Cu,and C-value),and δD values are generally suggestive of a warm and humid climate during the accu-mulation of the paleopeats.However,n-alkane proxies(Pwax,Paq,n-C23/n-C29,etc.)and polycyclic aromatic hydrocarbons(PAHs)distribution suggest that Balingian coals accumulated under relatively drier and strongly seasonal paleoclimate in the Late Pliocene.When compared with published global average abundances,the investigated coals are mostly depleted in major oxides and trace elements,suggesting peat accumulation in freshwater-influenced environments.Nonetheless,higher(＞0.5 wt％)total sulfur content in some Mukah-Balingian coals suggests some degree of epigenetic marine influence.Fur-thermore,the low to moderately-high ash contents of the Sarawak Basin coals indicate the presence of ombrotrophic and rheotrophic peat deposits.PCA result of selected geochemical proxies suggests that source input,paleoflora,and marine incursions are not major controlling influences on the petroleum potential.However,climatic,and depositional conditions appear to slightly influence the petroleum potential of the studied humic coals.
机标关键词：conditionsfrombasincenozoiccoalscontrolsdepositionalgeochemistry
论文发表日期：2024-08-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：38( 104-141 )
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