DOI: 10.1016/j.palaeo.2016.12.014
论文题名: Biomarker signatures of Permian Gondwana coals from India and their palaeobotanical significance
作者: Tewari A. ; Dutta S. ; Sarkar T.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 468 起始页码: 414
结束页码: 426
语种: 英语
英文关键词: Diterpenoids
; Glossopteris flora
; Higher plant biomarkers
; Palaeovegetation
; Permian
英文摘要: Coal samples belonging to the Lower Permian Barakar Formation and the Upper Permian Raniganj Formation, collected from Damodar Valley Basin of eastern India, have been analysed for understanding their organic geochemical characteristics using Rock-Eval pyrolysis, gas chromatography–mass spectrometry (GC–MS) and comprehensive two-dimensional gas chromatography coupled with time-of-flight mass spectrometry (GC×GC-TOFMS). The Rock-Eval pyrolysis parameters suggest that the coals from both the formations contain a mixture of Type-II and Type-III kerogen. The Rock-Eval Tmax values of the analysed coals vary from 417 to 451 °C. n-Alkanes ranging from C12 to C31 predominate the aliphatic hydrocarbons present in the coal extracts. The carbon preference indices (CPI) as well as the odd-to-even preference (OEP) values of the n-alkanes are > 1, suggesting input from higher vascular land plants. C29 Steranes predominate over C27 and C28 steranes, which corroborates contribution from terrestrial higher plants. Aliphatic diterpanes like ent-beyerane, isopimarane, abietane, phyllocladanes and ent-kaurane as well as aromatic diterpanes like simonellite, bisnorsimonellite, retene, methylretenes and tetrahydroretene which are mainly known to originate from conifers are detected in the studied coals. The Lower Gondwana floral assemblage of Peninsular India is mainly represented by Glossopteris flora (Pteridospermatophyta). However, some primitive conifers have also been reported from this succession. We propose that the diterpanes detected in the studied coals were possibly derived from the primitive conifers. This implies that the biosynthetic pathways to produce these diterpanes had evolved in the Gondwana flora during the Permian period. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/67975
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra, India; I-3, Central Mine Planning & Design Institute Limited, Gondwana Place, Kanke Road, Ranchi, Jharkhand, India
Recommended Citation:
Tewari A.,Dutta S.,Sarkar T.. Biomarker signatures of Permian Gondwana coals from India and their palaeobotanical significance[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,468