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岐口凹陷新近系包括明化镇组和馆陶组.通过新近系中的孢粉、介形虫和遗迹组构的系统研究,识别出孢粉53个属种,并建立了两个孢粉组合,分别为Magnastites(粗肋孢)-Ulmus(榆粉)-Taxodiaceaepollenites(杉粉)组合和Polygonaceae-Chenopodiaceae组合;发现介形虫12个属种,介形类以金星介科分子为主,少数湖花介科分子,以壳形单一、壳壁薄、表面光滑的类型为主,表现了典型的非海相淡水介形类面貌;划分出4种遗迹组构类型,分别为Scoyenia遗迹组构、Skolithos遗迹组构、Palaeophycus遗迹组构和强扰动组构.在此基础上,探索了生物与环境的关系,划分了A、B、C、D、E5种生物-遗迹相带,分别代表泛滥平原、蓄水注地或泛滥平原小型湖、河道及水下分流河道边部、滨浅湖和前三角洲沉积环境.
The Neogene in Qikou sag includes the Minghuazhen and Guantao formations.According to the systematic studies on the structures of sporopollen, ostracod and relic in the Neogene, 53 species of sporopollen were identified and two pollen Were combinations of Magnastites-Ulmus-Taxodiaceaeepollenites and Polygonaceae-Chenopodiaceae. There were 12 genera of ostracods, among which Venus medians were dominant, Lake Huatongke molecules, with a single shell, shell thin, smooth surface type, showing a typical non-marine surface features of freshwater mesa type; divided into four types of relics, namely Scoyenia relics , Skolithos relics, Palaeophycus relics and strong disturbances. On the basis of this, we explored the relationship between organisms and environment, and classified 5 bio-relics belonged to A, B, C, D and E, Plains, small reservoirs flooded or flood plains, riverside and underwater distributary channel margins, shore and shallow lakes, and sedimentary environment of the former delta.