山东济宁煤田(东区)晚古生代孢粉组合

STUDY ON LATE PALEOZOIC SPOROPOLLEN ASSEMBLAGES IN EAST PART OF JINING COALFIELD, SHANDONG PROVINCE

鉴定了山东济宁煤田 (东区 )晚古生代孢粉组合中的孢粉化石 70属 1 89种。据孢粉化石在地层中的分布和垂向的变化规律自上而下建立了 5个孢粉组合 :Ⅴ .Cyclogranis poritespressus Lycosporapellucida组合 ,Ⅳ .Granulatisporitespiroformis组合 ,Ⅲ .Sinulatisporitessinen sis组合 ,Ⅱ .Thymosporapseudothiessenii T .thiessenii组合 ,Ⅰ .Densosporitesannulatus组合。通过与邻区及华北部分地区对比 ,确定本区孢粉组合的地质时代应为 :晚石炭世晚期 (组合Ⅰ ) ,早二叠世早期 (组合Ⅱ ) ,早二叠世中期 (组合Ⅲ ) ,早二叠世晚期 (组合Ⅳ )和晚二叠世早期 (组合Ⅴ ) ,本区石炭系—二叠系界线应置于太原组第 1

By systematic study on the sporopollen assemblages in age of Late Palaeozoic in the east part of Jining Coalfield, Shandong Province, 70 genera and 189 species of sporopollen fossils have been found. According to the distribution and vertical variation of sporopollen fossils in the strata, the sporopollen may be distinguished into 5 assemblages as follows(in descending order): Ⅴ. Cyclogranisporites pressus Lycospora pellucida assemblage, Ⅳ. Granulatisporites piroformis assemblage,Ⅲ. Sinulatisporites sinensis assemblage,Ⅱ. Thymospora pseudothiessenii T.thiessenii assemblage,Ⅰ. Densosporites annulatus assemblage. Compared with those in nearby regions and some other areas in North China, the geological time of sporopollen assemblages in the east part of Jining Coalfield should be the late Late Carboniferous (assemblageⅠ), the early Early Permian (assemblageⅡ), the middle Early Permian (assemblage Ⅲ), the late Early Permian (assemblage Ⅳ) and the early Late Permian (assemblageⅤ), the boundary between Carboniferous and Permian in the east part of Jining Coalfield placed at the bottom of No.11 limestone in the Taiyuan Formation.