| 山东黄河北煤田石炭—二叠系太原组地层沉积特征 |
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| 关键词:Huanghebei coalfield Taiyuan Formation depositional condition depositional facies analyzing grain size |
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| Depositional Characteristics of Carboniferous-Permian Taiyuan Formation in Huanghebei Coalfield, Shandong Province |
| In order to study the depositional features of the Huanghebei Coalfield,determined the type of stratigraphic lithology,sedimentary structure and the particle size distribution of Taiyuan Formation in the study area,and reveal sedimentary evolution of the sedimentary system and sedimentary facies,the authors made detailed investigations into the stratigraphic depositional feaures of Taiyuan Formation.Through the observation of field outcrop and description of drill cores and thin-section analysis,combined with drill data and well-log information,the authors used such means as sedimentology,paleobiology,stratigraphy,sequence stratigraphy and grading analysis to perform the study.The result shows that the Taiyuan Formation has abundant medium-grained sandstone,siltstone,mudstone,limestone and coal seam in the Carboniferous-Permian coal-bearing strata,and the iron-bearing minerals are mainly limonite,pyrite and siderite.Main bedding structures include horizontal bedding,parallel bedding,cross bedding,current bedding and rhythmical bedding.Bioturbate structure is well developed.Main oryctocoenose preserved in limestone of platform facies includes various types of large bodies,such as Schwagerina subnathorsti(Lee),S.sp.,Streptognathodus elongutes,Hindeodus sp.,and Anchignathodus sp.The plant fossils are Annularia sp.,Cordaites sp.,and Taeniopteris nystroemii.Sedimentary environment of Taiyuan Formation is instable,and is mainly a river facies and shallow sea facies environment.The typical surface of stratigraphic sequence and units of continental sea are of three kinds,i.e.,the largest marine flood surface,the regression surface of the area,and the largest regression surface.According to different surfaces,the depositional facies division and the analysis of strata sequence were completed.Strata of Late Carboniferous Taiyuan Formation are of the continental sea sedimentary sequence.The sedimentary environment was converted from paralic deposition to continental deposition. |
| ZHANG Su-mei,LI Zeng-xue,LI Wei,WANG Li-feng,ZHANG Yu-lin,WANG Dui-xing,LIU Hai-yan.2008.Depositional Characteristics of Carboniferous-Permian Taiyuan Formation in Huanghebei Coalfield, Shandong Province[J].Acta Geoscientica Sinica,29(4):414-426. |
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