吉林省九台县羊草沟煤矿孢粉组合及时代

SPOROPOLLEN ASSEMBLAGES AND THEIR AGESIN THE YANGCA OGOUCOAL MINE JIUTAI COUNTY JILIN PROVINCE

摘要: 本文介绍了羊草沟煤矿区的地层概况,对营城组和泉头组孢粉组合分子的基本特点,进行了详细地剖析,并与国内外已有研究成果作了对比。认为其时代均属于早白垩世,其中前者为巴列姆-阿普梯期,后者为阿尔必期。

Abstract: The Yangcaogou coal mining area is located on the southeastern margin of the Songliao subsidence zone, within the territory of Jiutai county, Changchun City. In the area the Early Cretaceous Yingcheng Formation and Quantou Formation contain an abundance of spores and pollen. From below upwards three sporopollen assemblages may be distinguished. 1. The volcanic rock member of the Yingcheng Formation The sporopollen assemblage is represented by Cyatidites-Cicatricosisporites-Pinuspollenites. 2. The coal-bearing clastic rock member of the Yingcheng Formation The sporopollen assemblage is represented by Appendicisporites-Cicatricosis porites-piceaepollenites-clavatipollenites. The geological age of the Yingcheng Formation is early Barremian-Aptian. 3. The Quantou Formation The sporopollen assemblage is represented by Schizaeoisporites-pinaceae-Tricolpopollenites. Its geological age is Albian （Early Cretaceous）, but the possibility of its assignment to the early Late Cretaceous cannot be ruled out.