内蒙古满洲里扎赉诺尔煤矿早白垩世孢粉组合序列和古气候研究  

EARLY CRETACEOUS PALYNOLOGICAL ASSEMBLAGE SEQUENCE AND PALAEOCLIMATE RESEARCH IN ZHALAINUOER COALMINE,MANZHOULI,INNER MONGOLIA

作　　者：程金辉[1] 尚玉珂[1,2] 

机构地区：[1]中国科学院南京地质古生物研究所,南京210008 [2]沈阳师范大学古生物学院,沈阳110034

出　　处：《古生物学报》2015年第3期316-341,共26页Acta Palaeontologica Sinica

基　　金：国家自然科学基金(41102019;91114201;41272014)资助

摘　　要：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。Summary The Damoguaihe Formation is a widespread series of terrestrial coal-bearing strata to the west of the Daxing＇anling Mountains, with the type lo- cality at Damoguaihe, Xuguit Banner of Inner Mongolia. This stratigraphic name was established by Liu Guo-chang in 1951, who considered this formation as Jurassic. In 1973, the Department of Geology of the Headquaters of Yimin Coalfield attributed it in the lower part of the Zhalainuoer Group and considered its geological age as Early Cretaceous. Pu and Hong （1985） studied spore and pollens in the Damoguaihe Formation, but most of their samples were collected from drills and waste rocks. In July of 2012, one of the authors （ Cheng Jin-hui ） went to the opencast coalmine in Zhalainuoer and systematically collect ed 22 palynological samples. After making chemical maceration, 10 samples have been proved to be rich in palynomorphs. The palynological assemblage changes significantly and can be divided into 3 sub-assemblages from bottom to top as the following ： 1 ） Concavissimisporites-Foraminisporis-Classopollis Sub-assemblage This sub-assemblage consists of palynomorphs of sample ZYN001-1, ZYN001-2 and ZYN002. There are 45 genera and 71 species of palynomorphs, among which the amount of pollens of Gymnospermae （22 genera and 36 species） acounting for 69. 34% of the total number are much more than spores of Pteridophyta （22 genera and 33 species） accounting for 27. 80%. The main compo nents of Gymnospermae are disaccate pollens accounting for 39.62% of the total number, among which developed disaccate pollens account for 26.85% and undeveloped ones account for 12.77%. Pollens of Taxodiaceae account for 3.60% of the total number, Ginkgo and cycads 3.29%, Cheirolepidiaceae 3. 04%, Araucariaceae sporadic. Among the pollens of Gymnospermae incertae sedis, Callialasporites accounts for 2.22 %, Jiaohepollis very few, other pollens such as Quadraeculina and Cerebropollenites account for less than 2% respectively.

关 键 词：孢粉 亚组合 大磨拐河组 早白垩世 扎赉诺尔 内蒙古 

分 类 号：Q914[天文地球—古生物学与地层学]