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内蒙古满洲里扎赉诺尔露天煤矿为大兴安岭西侧重要含煤产地,经自下而上逐层采集孢粉样品,在大磨拐河组获得十分丰富的孢粉化石。根据孢粉属种与含量的变化,划分出三个孢粉亚组合:1)Concavissimisporites-Foraminisporis-Classopollis亚组合,时代为Valanginian期;2)Aequitriradites-Hsuisporites-Jiaohepollis亚组合,时代为Hauterivian期;3)Cicatricosisporites-Pilosisporites-Pinuspollenites亚组合,时代为Barremian期。这种细致划分对于进一步探讨地层内部生物演化及煤层详细对比有较重要意义。本文还探讨了该地区的三个亚组合时期的古气候演变,并命名了6个新种。
Inner Mongolia Manchuria Zhalai Nuo open-pit coal mine is an important coal-producing area on the west side of Daxinganling. Sporopollen samples were collected layer by layer from top to bottom and rich sporopollen fossils were obtained from Damoguaihe Formation. According to the species and content of sporopollen, three sub-groups of sporopollen were divided: 1) the sub-combination of Concavissimisporites-Foraminisporis-Classopollis, the Valanginian period; 2) the Aequitriradites-Hsuisporites-Jiaohepollis subgroup; the age was Hauterivian period; 3 ) Cicatricosisporites-Pilosisporites-Pinuspollenites sub-combination, the era of the Barremian period. This detailed division is of great importance for further exploration of the internal evolution of the strata and the detailed comparison of coal seams. This article also explores the paleoclimate evolution of the three sub-assemblages of the region and names six new species.