Palaeodepositional environment,implications of Glossopteris flora,and organic matter characteristics from the Lower Permian,Karo Open Cast Mine,East Bokaro Coalfield,Damodar Basin,India  

作　　者：Sankar Suresh Kumar Pillai Rose Ann Sebastian Runcie Paul Mathews Srikanta Murthy Anju Saxena Mrutyunjaya Sahoo Suraj Kumar Sahu Gulshan Kumar Dhingra 

机构地区：[1]Birbal Sahni Institute of Palaeosciences,53 University Road,Lucknow-226007,UP,India [2]Academy of Scientific and Innovative Research(AcSIR),Ghaziabad-201002,India [3]Department of Geology,School of Earth Science Systems,Central University of Kerala,Kasaragod-671316,Kerala,India [4]Department of Geology,Ravenshaw University,Cuttack-753003,Odisha,India [5]Department of Botany,Sri Dev Suman Uttarakhand University,Uttarakhand-249145,India

出　　处：《Journal of Palaeogeography》2024年第3期528-546,共19页古地理学报（英文版）

基　　金：the Department of Science and Technology (DST),Government of India,for research grant No. IF200461

摘　　要：The present study deals with the Early Permian floral diversity,palaeoenvironment,palaeoclimate and depositional setting using a multiproxy approach that includes morphotaxonomy,palynology,and organic geochemistry of Karo OCM(Open Cast Mine),East Bokaro Coalfield,Damodar Gondwana Basin,India.The Permian sediments of Peninsular India are widely regarded as fluvial,along with some marine incursions.The macroplant fossil assemblage exhibits the presence of Glossopteridales,comprising Glossopteris,Gangamopteris,and Vertebraria,as well as Coniferales,which includes Noeggerathiopsis.The palynological assemblage encompasses the dominance of the striate bisaccate pollen Faunipollenites sp.and the subdominance of the non-striate bisaccate pollen Scheuringipollenites sp.with glossopterid affinities.The megafloral and palynofloral assemblage confirms the biostratigraphical age to be Late Barakar palynoflora of Kungurian affinity.The studied morphological characteristics,including small to large Glossopteris leaves exhibiting a lanceolate shape,acute apices,and acute cuneate or tapering bases,as well as entire margins with narrower lamina and narrow meshes,suggest the existence of a dense forest with the prevalence of a warm and humid climate during their deposition.The organic geochemical characterization based on functional group and biomarker analyses reveals the diagenetic effects on organic matter.Aliphatic symmetric(~2865-2855 cm^(-1))and asymmetric stretching(~2930-2910 cm^(-1))peaks are identifiable in coal samples,whereas they are absent in carbonaceous shale.The A-factor vs.C-factor plot suggests that the kerogen type is type Ⅲ,which can generate mainly gaseous kerogen.The vitrinite reflectance studies(R_(r) av.1.1%)show increased maturity of the samples,which is supported by the n-alkane distribution pattern and the absence of hopane terpenoids.The Indian floral assemblages in contemporary of southern Gondwana continents reveal a stronger inclination/affinity with the flora of Africa than that of South America,t

关 键 词：Glossopteris Palynomorph FTIR GCMS GONDWANA PERMIAN PALAEOCLIMATE 

分 类 号：P618.11[天文地球—矿床学]