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Palaeobotanical and biomarker evidence for Early Permian(Artinskian) wildfire in the Rajmahal Basin, India

Palaeobotanical and biomarker evidence for Early Permian(Artinskian) wildfire in the Rajmahal Basin, India

作     者:Srikanta Murthy Vinod Atmaram Mendhe Dieter Uhl Runcie Paul Mathews Vivek Kumar Mishra Saurabh Gautam Srikanta Murthy;Vinod Atmaram Mendhe;Dieter Uhl;Runcie Paul Mathews;Vivek Kumar Mishra;Saurabh Gautam

作者机构:Birbal Sahni Institute of Palaeosciences53University RoadLucknow 226007India CSIR-Central Institute of Mining and Fuel ResearchDhanbad 826015JharkhandIndia Senckenberg Forschungsinstitut und Naturmuseum FrankfurtSenckenberganlage 2560325 Frankfurt am MainGermany 

出 版 物:《Journal of Palaeogeography》 (古地理学报(英文版))

年 卷 期:2021年第10卷第1期

页      面:55-75页

核心收录:

学科分类:070903[理学-古生物学与地层学(含:古人类学)] 0709[理学-地质学] 07[理学] 

基  金:This study was funded by the Birbal Sahni Institute of Palaeosciences Department of Science and Technology Lucknow India Research Development and Coordination Committee(RDCC Permission Number 10/2020–2021) 

主  题:Palaeo-wildfire Palynology Fossil charcoal Biomarker Barakar Formation Rajmahal Basin 

摘      要:This study provides a combined analysis on the palynology, fossil charcoal and biomarkers of the subsurface coal deposits from a borehole RMB #2 drilled at the Dhulia Coal Block, Rajmahal Basin, India, in attempts to establish the chronology of sedimentation and to propose palaeobotanical as well as geochemical evidence for the occurrence of wildfires in these sediments. The palynological investigation suggests a Scheuringipollenites barakarensis palynoassemblage from the lower Barakar Formation, dated as Artinskian(Early Permian) in age. This assemblage reveals the dominance of Glossopteridales and sub-dominance of taxa belonging to Cordaitales and *** charcoal in sediments is usually recognized as a direct indicator for the occurrence of palaeo-wildfires. More data involving the anatomical features of fossil charcoal analyzed by Field Emission Scanning Electronic Microscope broaden our knowledge on Early Permian wildfires from the peninsula of India. The studied macroscopic charcoal fragments exhibit anatomical details such as homogenized cell walls, uniseriate simple and biseriate alternate pitting on tracheid walls and rays of varying heights pointing to a gymnospermous wood affinitity. The excellent preservation of charcoal fragments, shown by their large sizes and almost unabraded edges, suggests a parautochthonous origin. The embedded biomarker study performed for charcoal sediments and its characterization demonstrate the presence of n-alkanes, isoprenoids, terpenoids and aromatic compounds. A bimodal distribution pattern of n-alkanes with a Cmaxat n-C25 is identified. Diterpenoids and pentacyclic terpenoids are identified, indicating the input of an early conifer vegetation and bacterial activity, respectively. The identified polyaromatic hydrocarbon(PAH) compounds, together with the charcoal fragments, clearly suggest that repeated wildfire events occurred during the deposition of these Artinskian sediments in the Rajmahal Basin.

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