摘要
本文研究黑龙江东部西三江地区中生代煤系地层3个岩组中的孢粉组合。其中城子河组孢粉组合丰富,时代属欧特里期至巴列姆期,但目前材料尚不能对城子河组进行有意义的孢粉地层再分。穆棱组下部与城子河组的孢粉组合相似,反映植物群的渐变过程。东荣组的孢粉组合及其与邻区地层的对比关系亦有讨论,其时代有属凡兰吟期的可能。
The coal series in the Three-River Area, eastern Heilongjiang is composed of the Suibin, Dongrong, Chengzihe and Muling Formations in ascending order. The present paper deals witli the spore-pollen assemblages from the latter three formations encountered in five boreholes (textfigs. 1, 2). The assemblage from the Chengzihe formation is considered as of the Hauterivian—Bar- remian age due to the presence of such species as Concavissimisporites valanjinensis (Kara-Murza) Zhang, lmpardecispora trioreticulata (Cookson et Dettmann) Venkatachala et al., Pilosisporites trichopapillosus (Thiergart) Delcourt et Sprumont, P. notensis Cookson et Dettmann, Cicatricosisporites australiensis (Cookson) Balme, C. gracilis Li, C. htdbrookiae Dettmann, C. daxinganlingensis Pu et Wu, Plicatella exiliformis Maljawkina, Appendicisporites markovae Voronova, Fixisporites tortus Chlonova, Contignisporites mitriforrnis (Verbitzkaja) Dettmann, C. multimura'us Dettmann, Triporoletes singularis Mtchedlishvili, T. reticulatus (Pocock) Playford, Foraminisporis asymmetricus (Cookson et Dettmann) Dettmann, Couperisporites complexus (Couper) Pocock, Aequitriradites spinulosus (Cookson et Dettmann) Cookson et Dettmann, A. verrucosus (Cookson et Dettmann) Cookson et Dettmann and A. echinatus Pu et Wu., but few taxa of this assemblage are useful for a significant subdivision of the Chengzihe Formation. The assemblage from a core at the bottom of the Muling Formation (Borehole SF232) shows a similar feature to those from the conformably underlying Chengzihe Formation. Only a few palynomorphs were found in the two studied samples from the Dongrong Formation. Based on the previous data by Pu and Wu (1982, 1985a, b) and Zhang (1986) from the Dongrong Formation in other boreholes and from the equivalents of its overlying and underlying formations in adjacent areas, a discussion is made on the assignment of the Dongrong Formation to the Berriasian—Valanginian age.
出处
《古生物学报》
CAS
CSCD
北大核心
1992年第2期178-189,263-266,共12页
Acta Palaeontologica Sinica
关键词
孢粉组合
早白垩世
黑龙江
Early Cretaceous, coal series, spore-pollen assemblage, eastern Heilongjiang.
