吐哈盆地台北凹陷七克台组孢粉组合

SPOROPOLLEN ASSEMBLAGE OF QIKETAI FORMATION IN TAIBEI SAG OF TURPAN - HAMI BASIN.

对采自吐哈盆地台北凹陷葡1井和草南1井的样品进行了分析,在七克台组共发现孢粉化石32属54种,依据属种含量分布特征与地层意义,孢粉组合可确立为以Cranu-latisporites-Classopollis-Podocarpidites为代表的组合,其中裸子植物花粉占优势,含量为68.7%,蕨类植物孢子含量为31.3%,与邻区及国内其他地区同时代孢粉组合的对比,认为七克台组孢粉组合与我国陕甘宁盆地中部直罗组、甘肃靖远王家山组、河北北部九龙山组所含的孢粉组合较相似,其地质时代应属中侏罗世晚期,大致相当Bathonian-Callovian期.

Sporopollen fossiles of 32 genera and 54 species were discovered in Qiketai formation by analysing the samples from wells Pu 1 and Caonan 1 in Tabei sag of Turpan - Hami basin. The typical Granulatisporites-Classopollis-Podocarpidites sporopollen assemblage can be identified according to distribution characteristics of genera and species and their stratigraphic significances. Gymnospermous pollen prevails(68.7% ), pteridophyta spore is next(31.3% ) . Compared with the isochronical sporopollen assemblage at home and abroad in geologic history of main classes and major genera and species, the sporopollen assemblage in Qiketai formation is considered similar to the ones from Zhiluo formation of central Shaanxi - Gansu - Ningxia basin, Wangjiashan formation of Jingyuan, Gansu, and Jiulongshan formation of northern Hebei province. Its geologic age should be late Mid Jurassic, that is Bathonian - Callovian period.